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Chapter 2

Configuration and Installation

SCXI-1121 User Manual

2-28

ni.com

SCXI-1121 Shunt Calibration

Shunt calibration circuits are independent from each other but are 
controlled together. In other words, when SCAL is set to 1 on the 
SCXI-1121, all the shunt switches close; when SCAL is cleared to 0, all the 
switches open. At startup or reset, all switches are open. This shunt 
calibration circuitry configuration places a shunting resistor in parallel with 
the strain gauge as shown in Figure 2-10.

Figure 2-10.  

Shunt Circuit

The shunting resistors 

R

SCAL

 are socketed so that you can replace them with 

a resistor of another value to achieve the required changes. The 

R

SCAL

 

resistors on your terminal block have a 301 k

Ω

 ±1% value.

W3

Nulling circuit of Channel 2 is enabled; 
factory setting

Nulling circuit of Channel 2 is disabled

W4

Nulling circuit of Channel 3 is enabled; 
factory setting

Nulling circuit of Channel 3 is disabled

Table 2-12.  

Jumper Settings of the Nulling Circuits (Continued)

Jumper

Position

Description

•

•

D

E

•

•

D

E

•

•

D

E

•

•

D

E

SCAL

EX+

R

CH+

EX–

R

SCAL

SCXI-1321

R

g

R

R

CH–

Summary of Contents for SCXI-1320

Page 1: ...SCXI TM SCXI 1121 User Manual SCXI 1121 User Manual April 2010 373143A 01 ...

Page 2: ... 3400 Lebanon 961 0 1 33 28 28 Malaysia 1800 887710 Mexico 01 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 0800 553 322 Norway 47 0 66 90 76 60 Poland 48 22 328 90 10 Portugal 351 210 311 210 Russia 7 495 783 6851 Singapore 1800 226 5886 Slovenia 386 3 425 42 00 South Africa 27 0 11 805 8197 Spain 34 91 640 0085 Sweden 46 0 8 587 895 00 Switzerland 41 56 2005151 Taiwan 886 02 2377 2222 Th...

Page 3: ...nt of National Instruments Corporation National Instruments respects the intellectual property of others and we ask our users to do the same NI software is protected by copyright and other intellectual property laws Where NI software may be used to reproduce software or other materials belonging to others you may use NI software only to reproduce materials that you may reproduce in accordance with...

Page 4: ...re encouraged to try to correct the interference by one or more of the following measures Reorient the antenna of the receiver the device suffering interference Relocate the transmitter the device generating interference with respect to the receiver Plug the transmitter into a different outlet so that the transmitter and the receiver are on different branch circuits Some hardware may require the u...

Page 5: ...g Configuration 2 7 Grounding Shielding and Reference Mode Selection 2 7 Input Channel Jumpers 2 9 Excitation Jumpers 2 10 Hardware Installation 2 14 Signal Connections 2 15 Front Connector 2 15 Front Connector Signal Descriptions 2 17 Analog Input Channels 2 19 Excitation Channels 2 21 Temperature Sensor Connection 2 21 Connector and Shell Assembly 2 22 SCXI 1320 SCXI 1328 and SCXI 1321 Terminal ...

Page 6: ...anning 3 15 Multiple Module Multiplexed Scanning 3 16 Multiple Chassis Scanning 3 17 Chapter 4 Register Descriptions Register Description 4 1 Register Description Format 4 1 SCXI 1121 Registers 4 1 Slot 0 Register Descriptions 4 5 Chapter 5 Programming Programming Considerations 5 1 Notation 5 1 Register Writes 5 1 Register Selection and Write Procedure 5 2 Initialization 5 4 Single Channel Measur...

Page 7: ...Parts Locator Diagrams Glossary Index Figures Figure 2 1 SCXI 1121 General Parts Locator Diagram 2 2 Figure 2 2 SCXI 1121 Detailed Parts Locator Diagram 2 3 Figure 2 3 SCXI 1121 Front Connector Pin Assignment 2 16 Figure 2 4 Ground Referenced Signal Connection with High Common Mode Voltage 2 19 Figure 2 5 Floating Signal Connection Referenced to Chassis Ground for Better Signal to Noise Ratio 2 19...

Page 8: ...nterface Circuitry Block Diagram 3 6 Figure 3 4 SCXI 1121 Digital Control 3 7 Figure 3 5 Analog Input Block Diagram 3 9 Figure 3 6 Analog Output Circuitry 3 12 Figure 3 7 Single Module Parallel Scanning 3 14 Figure 3 8 Single Module Multiplexed Scanning Direct 3 15 Figure 3 9 Single Module Multiplexed Scanning Indirect 3 16 Figure 3 10 Multiple Module Multiplexed Scanning 3 16 Figure 3 11 Multiple...

Page 9: ...annel 2 25 Table 2 11 Nulling Resistors and Corresponding Channel 2 25 Table 2 12 Jumper Settings of the Nulling Circuits 2 27 Table 2 13 Jumper Settings on the SCXI 1320 Terminal Block 2 31 Table 2 14 Jumper Settings on the SCXI 1328 Terminal Block 2 31 Table 2 15 Jumper Settings on the SCXI 1321 Terminal Block 2 32 Table 2 16 SCXIbus to SCXI 1121 Rear Signal Connector to Data Acquisition Board P...

Page 10: ...tallation basic programming considerations and theory of operation for the SCXI 1121 Conventions The following conventions appear in this manual Angle brackets that contain numbers separated by an ellipsis represent a range of values associated with a bit or signal name for example AO 3 0 The symbol leads you through nested menu items and dialog box options to a final action The sequence File Page...

Page 11: ...helpful as you read this manual AT MIO 16 User Manual part number 320476 01 AT MIO 16D User Manual part number 320489 01 AT MIO 16F 5 User Manual part number 320266 01 AT MIO 16X User Manual part number 320488 01 AT MIO 64F 5 User Manual part number 320487 01 Lab LC User Manual part number 320380 01 Lab NB User Manual part number 320174 01 Lab PC User Manual part number 320205 01 Lab PC User Manua...

Page 12: ...SCXI systems However the Lab PC cannot control multiple chassis SCXI systems You can use the Lab NB the Lab PC the Lab LC and the PC LPM 16 boards with the SCXI 1121 but these boards can control only single chassis SCXI systems and cannot scan the module when it is configured in the Multiplexed Output mode These boards can perform only single channel reads in this mode You can also use the SCXI 11...

Page 13: ...applications LabVIEW uses graphical programming whereas LabWindows enhances Microsoft C and QuickBASIC Both packages include extensive libraries for data acquisition instrument control data analysis and graphical data presentation Your National Instruments data acquisition board is shipped with the NI DAQ software NI DAQ has a library of functions that you can call from your application programmin...

Page 14: ...ta acquisition boards with LabVIEW for Macintosh a software system that features interactive graphics a state of the art user interface and a powerful graphical programming language The LabVIEW Data Acquisition VI Library a series of VIs for using LabVIEW with National Instruments boards is included with LabVIEW The LabVIEW Data Acquisition VI Library is functionally equivalent to the NI DAQ softw...

Page 15: ... assembly 776573 30 SCXI 1340 cable assembly 776574 40 SCXI 1341 Lab NB Lab PC Lab PC cable assembly 776574 41 SCXI 1342 PC LPM 16 cable assembly 776574 42 SCXI 1343 rear screw terminal adapter 776574 43 SCXI 1344 Lab LC cable assembly 776574 44 SCXI 1346 shielded multichassis cable adapter 776574 46 SCXI 1347 SCXI shielded cable assembly with 1 m cable with 2 m cable with 5 m cable with 10 m cabl...

Page 16: ...uctor 28 AWG stranded ribbon cables that can be used with these connectors are as follows Electronic Products Division 3M part number 3365 50 T B Ansley Corporation part number 171 50 The SCXI 1121 front connector is a 32 pin DIN C male connector with column A and column C even pins only The manufacturer part number used by National Instruments for this connector is as follows Panduit Corporation ...

Page 17: ...tatic discharge To avoid such damage in handling the module take the following precautions Touch the antistatic package to a metal part of your SCXI chassis before removing the module from the package Remove the module from the package and inspect the module for loose components or any other sign of damage Notify National Instruments if the module appears damaged in any way Do not install a damage...

Page 18: ...ion This chapter describes the SCXI 1121 jumper configurations installation of the SCXI 1121 into the SCXI chassis signal connections to the SCXI 1121 and cable wiring Module Configuration The SCXI 1121 contains 49 jumpers that are shown in the parts locator diagrams in Figures 2 1 and 2 2 ...

Page 19: ...Chapter 2 Configuration and Installation SCXI 1121 User Manual 2 2 ni com Figure 2 1 SCXI 1121 General Parts Locator Diagram ...

Page 20: ...ies the SLOT0SEL signal from the rear signal connector after buffering to the SCXIbus INTR line and should be left in the factory set position position 1 On Revision C or later modules jumper W44 does not exist User configurable jumper Jumper W38 carries the SCXIbus MISO line after buffering to the SERDATOUT signal on the rear signal connector On Revision C or later modules jumper W32 connects a p...

Page 21: ... and W18 W27 and W28 and W39 and W40 configure the half bridge completion network for channels 0 through 3 respectively Further configuration of the board is software controlled and will be discussed later in this chapter Digital Signal Connections The SCXI 1121 has three jumpers dedicated for communication between the data acquisition board and the SCXIbus These jumpers are W32 W38 and W44 Jumper...

Page 22: ...sion C or later modules Position 1 connects a 2 2 kΩ pull up resistor to the SERDATOUT line factory default setting and Position 3 does not connect the pull up resistor to the SERDATOUT line Using Jumpers W32 and W38 Set jumpers W32 and W38 as follows If the SCXI 1121 is not cabled to a data acquisition board the positions of these jumpers do not matter so leave them in their factory default posit...

Page 23: ... not used You set jumper W38 as explained in the cases above except in the case of a multiple chassis ribbon cable system In a multichassis ribbon cable system with Revision A and B SCXI 1121s cabled to the data acquisition board you can access the MISO line in only one chassis Pick one of the chassis and set jumper W38 to position 1 on the SCXI 1121 in that chassis that is cabled to the data acqu...

Page 24: ... connects the analog reference to the analog output ground pins 1 and 2 on the rear signal connector Select this configuration if you are using an RSE data acquisition board It is not recommended to use a differential input data acquisition board when jumper W33 is in the AB R0 position Position AB R1 connects the analog reference to the SCXIbus guard Position A R0R1 is the parking position and th...

Page 25: ... input It is not recommended to use differential input data acquisition boards when jumper W33 is in the AB R2 position Table 2 2 Jumper W33 Settings Jumper Description Configuration W33 Factory setting in parking position W33 Connects the analog reference to AOGND pins 1 and 2 of the rear signal connector W33 Connects SCXIbus guard to the analog reference W33 Enables the Pseudodifferential Refere...

Page 26: ... a second stage gain set to 10 position D To change the gain of your module move the appropriate jumper on your module to the position indicated in Table 2 4 Refer to Figure 2 2 for the jumper locations on your module To determine the overall gain of a given channel use the following formula Overall gain First stage gain second stage gain Table 2 3 Gain Jumper Allocation Input Channel Number First...

Page 27: ...e to set both stages to the same bandwidth This will ensure that the required bandwidth is achieved Excitation Jumpers Current and Voltage Excitation Jumpers You can configure each excitation channel of your SCXI 1121 to either a Voltage or Current excitation mode Each channel has two jumpers for this purpose Set both jumpers in the same mode for correct operation of the excitation channel Refer t...

Page 28: ...on according to the load you are using Table 2 7 lists the maximum load that can be driven per channel at each level of excitation for both volt and current excitation Table 2 6 Voltage and Current Mode Excitation Jumper Setup Excitation Channel Jumpers Voltage Mode Factory Setting Current Mode 0 W14 and W15 1 W22 and W23 2 W34 and W35 3 W46 and W47 Table 2 7 Maximum Load per Excitation Channel Ex...

Page 29: ...e Voltage mode set to 3 333 V 0 150 mA 10 kΩ 0 450 mA 10 kΩ Table 2 8 Excitation Level Jumper Selection Excitation Channel Jumpers 3 333 V or 0 150 mA Factory Setting 10 V or 0 450 mA 0 W16 and W26 1 W24 and W25 2 W36 and W37 3 W48 and W49 Table 2 7 Maximum Load per Excitation Channel Continued Excitation Level Maximum Load W16 1 2 3 W26 1 2 3 W16 1 2 3 W26 1 2 3 W24 1 2 3 W25 1 2 3 W24 1 2 3 W25 ...

Page 30: ...annel pair When the completion network is enabled you cannot access the negative input of the amplifier which preserves the overvoltage protection of the channel Table 2 9 shows how to enable and disable the completion network Note When using the half bridge completion network with a quarter bridge setup you must use an extra resistor to complete the bridge Place this resistor on the terminal bloc...

Page 31: ... from your SCXI chassis 2 Turn off the SCXI chassis Do not insert the SCXI 1121 into a chassis that is turned on 3 Insert the SCXI 1121 into the board guides Gently guide the module into the back of the slot until the connectors make good contact If a cable assembly has already been installed in the rear of the chassis the module and cable assembly must be firmly engaged however do not force the m...

Page 32: ... on the SCXI chassis 8 Turn on the computer or reconnect it to your chassis The SCXI 1121 module is installed and ready for operation Signal Connections Caution Refer to the Read Me First Safety and Electromagnetic Compatibility document before removing equipment covers or connecting disconnecting any signal wires This section describes the input and output signal connections to the SCXI 1121 boar...

Page 33: ...121 Front Connector Pin Assignment Pin Number Signal Name Column A B C Signal Name 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 CGND 5 V EGND2 EX1 EGND3 EX3 CH3 EX2 CH2 EGND1 CH1 EGND0 EX0 EX3 CH3 EX2 DTEMP MTEMP CH2 EX1 CH1 EX0 CH0 CH0 SCAL RSVD RSVD ...

Page 34: ...XI 1321 shunt calibration switch CMOS TTL output not protected C6 C8 RSVD Reserved These pins are reserved Do not connect any signal to these pins A8 C10 C16 C22 C28 No Connect Do not connect any signal to these pins A10 EGND3 Excitation Ground 3 This pin connects to the excitation ground 3 via a 51 kΩ resistor A12 EX3 Positive Excitation Output 3 This pin is connected to the excitation channel 3 ...

Page 35: ...1 Positive Excitation Output 1 This pin is connected to the excitation channel 1 positive output C24 EX1 Negative Excitation Output 1 This pin is connected to the excitation channel 1 negative output A26 CH1 Positive Input Channel 1 This pin is connected to the input channel 1 positive input C26 CH1 Negative Input Channel 1 This pin is connected to the input channel 1 negative input A28 EGND0 Exci...

Page 36: ...e referenced to a ground level with common mode voltage up to 250 Vrms For better noise immunity connect the negative input channel to the signal reference If the measured signals are floating connect the negative input channel to chassis ground on the terminal block Figure 2 4 shows how to connect a ground referenced signal Figure 2 5 shows how to connect a floating signal Figures 2 6 and 2 7 sho...

Page 37: ...ugh necessary in this case lowers the input impedance of the input channel amplifier and introduces an additional offset voltage proportional to the input bias current and to the resistor value used The typical input bias current of the amplifier consists of 80 pA and a negligible offset drift current When a 100 kΩ resistor is used this will result into 8 µV of offset which is insignificant in mos...

Page 38: ...n channels are available Each excitation channel corresponds to an input channel A 250 Vrms isolation barrier exists between two corresponding channels for example between input channel 0 and excitation channel 0 In addition the excitation outputs are overvoltage protected to 250 Vrms with current foldback Caution Exceeding the overvoltage protection or isolation rating on the excitation output ca...

Page 39: ...ly to your SCXI module 1 Refer to Figure 2 8 and the diagram included with your SCXI 1330 kit to build the connector and shell assembly 2 Turn off the computer that contains your DAQ board or disconnect the board from your SCXI chassis 3 Turn off your SCXI chassis 4 Slide the selected module out of the SCXI chassis 5 Remove the module cover 6 Place one jack screw on the SCXI 1121 as indicated in F...

Page 40: ... terminal block the SCXI 1328 isothermal terminal block has a high accuracy onboard temperature sensor The terminal block kits are listed in the Optional Equipment section in Chapter 1 Introduction The terminal blocks consist of a shielded board with supports for connection to the SCXI 1121 input connector The terminal blocks have 18 screw terminals for easy connection Four pairs of screw terminal...

Page 41: ... for any damages or injuries resulting from inadequate safety earth ground connections SCXI 1320 and SCXI 1328 Terminal Blocks When connecting your signals to the SCXI 1320 terminal block for use with the SCXI 1121 follow the labeling on the SCXI 1320 indicated under the module type column for the SCXI 1121 as indicated in Figure 2 11 When connecting your signals to the SCXI 1328 high accuracy iso...

Page 42: ...per with a flathead screwdriver until you reach 0 V You have nulled your bridge and are ready for a measurement The nulling range for your terminal block is 2 5 mV assuming that you have a 120 Ω strain gauge and 3 333 V excitation voltage You can change this range by replacing the nulling resistor with a resistor of another value Each channel has an independent nulling resistor You can therefore m...

Page 43: ...esistance value Rd is either a completion resistor or a second strain gauge nominal resistance Rnull is the nulling resistor value Vexc is the excitation voltage 3 333 or 10 V For example assuming Vexc 3 333 V Rg 120 Ω Rd 120 Ω Rnull 39 kΩ Vnulling 2 56 mV Assuming a strain gauge range with a gauge factor of GF 2 and a quarter bridge configuration this range corresponds to 1 498 µε as given by the...

Page 44: ...it of the channel of interest You can do this in two steps 1 Place the enable disable jumper in position D disable as shown in Table 2 12 2 Remove the nulling resistor from its sockets Table 2 12 Jumper Settings of the Nulling Circuits Jumper Position Description W1 Nulling circuit of Channel 0 is enabled factory setting Nulling circuit of Channel 0 is disabled W2 Nulling circuit of Channel 1 is e...

Page 45: ...tor in parallel with the strain gauge as shown in Figure 2 10 Figure 2 10 Shunt Circuit The shunting resistors RSCAL are socketed so that you can replace them with a resistor of another value to achieve the required changes The RSCAL resistors on your terminal block have a 301 kΩ 1 value W3 Nulling circuit of Channel 2 is enabled factory setting Nulling circuit of Channel 2 is disabled W4 Nulling ...

Page 46: ...te thermocouples with the SCXI 1121 the terminal block has an onboard temperature sensor for cold junction compensation You can connect this temperature sensor in two ways You can connect the temperature sensor to the MTEMP pin C4 on the module front connector and multiplex the sensor at the output multiplexer along with the amplifier outputs This is the Multiplexed Temperature Sensor MTS mode Ref...

Page 47: ...is the temperature in kelvin a 1 288 10 3 b 2 356 10 4 c 9 556 10 8 RT resistance of the thermistor in Ω VTEMPOUT output voltage of the temperature sensor where T F and T C are the temperature readings in degrees Fahrenheit and degrees Celsius respectively Terminal Block Jumper Configuration In addition to the screw terminals the terminal block has one jumper for configuring the onboard temperatur...

Page 48: ...h the output multiplexer One jumper block comprises both positions therefore you can use only one type of configuration at a time The parking position for the jumper block is in the MTEMP position the temperature sensor is disabled until the RTEMP bit in the Configuration Register selects the sensor Tables 2 13 2 14 and 2 15 show the jumper settings on the SCXI 1320 SCXI 1328 and SCXI 1321 termina...

Page 49: ...ct the signal to the terminal block use the following procedure 1 Remove the grounding screw of the top cover 2 Snap out the top cover of the shield by placing a screwdriver in the groove at the bottom of the terminal block 3 Slide the signal wires one at a time through the front panel strain relief opening You can add padding or insulation if necessary 4 Connect the wires to the screw terminals F...

Page 50: ...1121 User Manual Figure 2 11 shows a parts locator diagram for the SCXI 1320 terminal block Figure 2 12 shows a parts locator diagram for the SCXI 1328 terminal block Figure 2 13 shows a parts locator diagram for the SCXI 1321 terminal block Figure 2 11 SCXI 1320 Parts Locator Diagram ...

Page 51: ...Chapter 2 Configuration and Installation SCXI 1121 User Manual 2 34 ni com Figure 2 12 SCXI 1328 Parts Locator Diagram ...

Page 52: ...nect the terminal block to the SCXI 1121 front connector perform the following steps 1 Connect the SCXI 1121 front connector to its mating connector on the terminal block 2 Make sure that the SCXI 1121 top and bottom thumbscrews do not obstruct the rear panel of the terminal block 3 Tighten the top and bottom screws on the back of the terminal block to hold it securely in place ...

Page 53: ...crew terminal adapter or the SCXI 1351 one slot cable extender with the SCXI 1121 you should read this section Figure 2 14 shows the pin assignments for the SCXI 1121 rear signal connector Figure 2 14 SCXI 1121 Rear Signal Connector Pin Assignment RSVD SERCLK DIG GND SLOT0SEL DAQD A SERDATIN OUTREF MCH4 MCH3 MCH2 MCH1 MCH0 AOGND SCANCLK SERDATOUT DIG GND MCH4 MCH3 MCH2 MCH1 MCH0 AOGND 49 50 47 48 ...

Page 54: ...ial input data to a module or Slot 0 26 SERDATOUT Serial Data Out This signal taps into the SCXIbus MISO line to accept serial output data from a module 27 DAQD A Data Acquisition Board Data Address Line This signal taps into the SCXIbus D A line to indicate to the module whether the incoming serial stream is data or address information 29 SLOT0SEL Slot 0 Select This signal taps into the SCXIbus I...

Page 55: ...nded RSE measurements W33 should be in position AB R0 to connect the SCXI 1121 ground to the data acquisition analog ground Pin 19 is the OUTREF pin this pin is connected internally to the analog reference when jumper W33 is in position AB R2 Pins 3 through 12 are the analog output channels of the SCXI 1121 Pins 3 and 4 or MCH0 are a multiplexed output of all four input channels and the temperatur...

Page 56: ...is data DAQD A 0 or address DAQD A 1 information Pin 29 is SLOT0SEL and is equivalent to the SCXIbus INTR line It indicates whether the data on the SERDATIN line is being sent to Slot 0 SLOT0SEL 0 or to a module SLOT0SEL 1 Pins 24 and 33 are the digital ground references for the data acquisition board digital signals and are tied to the module digital ground Pin 37 is SERCLK and is equivalent to t...

Page 57: ...inimum VIL input logic low voltage 0 8 V maximum II input current leakage 1 µA maximum Digital output specifications referenced to DIG GND VOH output logic high voltage 3 7 V minimum at 4 mA maximum VOL output logic low voltage 0 4 V maximum at 4 mA maximum Timing Requirements and Communication Protocol Timing Signal The data acquisition timing signal is SCANCLK SCANCLK is used to increment MUXCOU...

Page 58: ...data acquisition board determines to which slot it will talk by writing a slot select number to Slot 0 In the case of an SCXI 1001 chassis this write also determines to which chassis the data acquisition board will talk Writing a slot select number is also used in programming the Slot 0 hardscan circuitry Refer to Chapter 5 Programming for information on programming the Slot 0 hardscan circuitry T...

Page 59: ...s rising edge clocks the data 4 Set SLOT0SEL to 1 This will assert the SS line of the module whose slot number was written to Slot 0 If multiple chassis are being used only the appropriate slot in the chassis whose address corresponds to the written chassis number will be selected When no communication is taking place between the data acquisition board and 0 1 0 0 1 1 0 1 1 Chassis ID 9 Slot 11 SE...

Page 60: ... Module ID Register by following the protocols given below The contents of the Module ID Register are reinitialized by deasserting Slot Select After the 32 bits of data are read from the Module ID Register further data will be zeros until reinitialization occurs To write to the Configuration Register follow these steps 1 Initial conditions SS asserted low SERDATIN don t care DAQD A 0 indicates dat...

Page 61: ...lot Select Register Figure 2 18 illustrates a write to the SCXI 1121 Configuration Register of the binary pattern 10000011 00001111 Figure 2 18 Configuration Register Write Timing Diagram To read from the Module ID Register follow these steps 1 Initial conditions SS asserted low SERDATIN don t care DAQD A 1 Make sure DAQD A does not go low or erroneous data will be written to the Configuration Reg...

Page 62: ...cting another slot you should write zero to the Slot 0 Slot Select Register Figure 2 19 illustrates a read of the SCXI 1121 Module ID Register Figure 2 19 SCXI 1121 Module ID Register Timing Diagram For further details on programming these signals refer to Chapter 5 Programming SLOT0SEL SS SERCLK SERDATOUT Tdelay byte 0 2 byte 3 0 byte 2 0 byte 1 0 Tdelay SS high to SERDATOUT high 350 nsec maximum...

Page 63: ... unit making up the SCXI 1121 Functional Overview The block diagram in Figure 3 1 illustrates the key functional components of the SCXI 1121 Figure 3 1 SCXI 1121 Block Diagram SCXIbus Digital Interface and Control Timing and Analog Output Stage Front Connector Rear Signal Connector Isolated Section Nonisolated Section Input channel 0 Excitation 0 Input channel 3 Excitation 3 Temperature sensor ...

Page 64: ...1121 consists of four isolated amplifier channels with gains of 1 2 5 10 20 50 100 200 500 1 000 and 2 000 and four isolated excitation channels with voltage or current excitation The SCXI 1121 also has a digital section for automatic control of channel scanning for temperature selection and for MUXCOUNTER clock selection The theory of operation for each of these components is explained in the res...

Page 65: ...A15 B15 A16 B16 A17 B17 A18 B18 A19 B19 A20 B20 A21 B21 A22 B22 A23 B23 A24 B24 D1 C1 D2 C2 D3 C3 D4 C4 D5 C5 D6 C6 D7 C7 D8 C8 D9 C9 D10 C10 D11 C11 D12 C12 D13 C13 D14 C14 D15 C15 D16 C16 D17 C17 D18 C18 D19 C19 D20 C20 D21 C21 D22 C22 D23 C23 D24 C24 GUARD GUARD GUARD AB0 GUARD GUARD GUARD GUARD GUARD GUARD RESET MISO V V CHSGND CHSGND V V 5 V SPICLK TRIG0 SS GUARD GUARD GUARD GUARD GUARD GUARD...

Page 66: ...zes the module to its power up state Totem pole Input B19 MISO Master In Slave Out Transmits data from the module to the SCXIbus Open collector I O C19 D A Data Address Indicates to the module whether address information or data information is being sent to the module on MOSI Open collector I O D19 INTR Interrupt Active low Causes data that is on MOSI to be written to the Slot Select Register in S...

Page 67: ...sis In order for the data acquisition board to talk to a slot the board must first assert the SS for that slot This is done by asserting INTR low writing a 16 bit number over MOSI corresponding to the desired slot and chassis if an SCXI 1001 A24 TRIG0 TRIG0 General purpose trigger line used by the SCXI 1121 to send SCANCLK to other modules or receive SCANCLK from other modules Open collector I O B...

Page 68: ... Block Diagram The digital interface circuitry is divided into a data acquisition section and an SCXIbus section The SCXI 1121 connects to the SCXIbus via a 4 24 metal receptacle and to the data acquisition board via a 50 pin ribbon cable header The digital interface circuitry buffers the digital signals from the data acquisition board and from the SCXIbus and sends signals back and forth between ...

Page 69: ...rovides temperature channel selection and channel selection and configures the SCXI 1121 for scanning options All the control bits are fed into a latch before being routed to the rest of the module The channel select bits are taken directly from the shift register Complete descriptions of the register bits are given in Chapter 4 Register Descriptions Writes to the Configuration Register require th...

Page 70: ...s been asserted low Zeros are written to MISO thereafter until SS is released and reasserted The SCXI 1121 module ID is hex 00000002 Analog and Timing Circuitry The SCXIbus provides analog power 18 5 VDC that is regulated on the SCXI 1121 to 15 VDC a guard an analog bus AB0 and a chassis ground CHSGND AB0 buses the SCXI 1121 output to other modules or receives outputs from other modules via the SC...

Page 71: ...on 3 9 SCXI 1121 User Manual Figure 3 5 Analog Input Block Diagram Input Channel 1 Input Channel 2 Input Channel 3 MTEMP DTEMP Input Channel 0 LPF I To Output Stage To Output Stage To Output Stage To Output Stage LPF LPF LPF LPF I EX0 EX1 I I EX2 EX3 LPF LPF LPF ...

Page 72: ...e gain bandwidth product typically 800 kHz and G is the gain at this stage This BW might be of concern at high first stage gains such as 50 and 100 In this case the first stage amplifier has a BW equal to 16 kHz and 8 kHz respectively Because of this decrease in the amplifier bandwidth the channel overall bandwidth decreases but noise immunity improves If this bandwidth limitation is unacceptable ...

Page 73: ...ly isolated excitation channels each corresponding to an input channel For instance input channel 0 corresponds to excitation channel 0 Each excitation channel consists of a voltage current source with overvoltage protection and current limiting Two levels of excitation are available for each mode of operation In the voltage mode you can set the level to 3 333 V or 10 V in the current mode you can...

Page 74: ... be connected to MCH0 In the Single Channel Read mode the MUXCOUNTER is loaded with the desired channel number In the Scanning mode the counter is loaded with the first channel to be read During the scan the counter is clocked by SCANCLK from the data acquisition board or TRIG0 from the SCXIbus depending on the state of the CLKSELECT bit in the Configuration Register During scanning operations the...

Page 75: ...of the SCXI 1121 via switches to AB0 on the SCXIbus and on to other modules When you use multiple modules you can bus the output of the module via AB0 to the module that is connected to the data acquisition board In this case the AB0 switches of all the modules are closed whereas the output multiplexer of all the modules but the one being read are disabled Refer to Chapter 2 Configuration and Inst...

Page 76: ...e module provides all channels to the data acquisition board at all times You can implement single module parallel scanning with any data acquisition board that is appropriately cabled to the SCXI 1121 Figure 3 7 Single Module Parallel Scanning Multiplexed Scanning Only the MIO 16 data acquisition boards support multiplexed scanning on the SCXI 1121 During multiplexed scanning a module sends the S...

Page 77: ...eload its starting channel Notice that although you are using only a single module you can put many entries with different counts in the Slot 0 FIFO so that some channels are read more often than others You cannot change the start channel in the module Configuration Register during a scan Figure 3 8 Single Module Multiplexed Scanning Direct Single Module Multiplexed Scanning Indirect In this mode ...

Page 78: ... 0 as illustrated in Figure 3 10 The scan list in Slot 0 is programmed with the sequence of modules and the number of samples per entry Figure 3 10 Multiple Module Multiplexed Scanning Cable Assembly Data Acquisition Board Analog Input Timing Output Other Module Analog Bus 0 SCANCON X TRIG0 SCANCLK MCH0 SCXI 1000 or SCXI 1001 Chassis SLOT X SLOT 0 SCXI 1121 SCANCLK MCH0 Cable Assembly Data Acquisi...

Page 79: ...ies of Slot 13 to fill the samples when the data acquisition board will be sampling another chassis or data acquisition board channel This will keep the chassis synchronized Notice that you can only perform multiple chassis scanning with the SCXI 1001 chassis and MIO 16 data acquisition boards Refer to Chapter 5 Programming for more information on multiple chassis scanning Refer to Appendix E SCXI...

Page 80: ...f each bit The register bit map shows a diagram of the register with the MSB shown on the left bit 15 for a 16 bit register bit 7 for an 8 bit register and the LSB shown on the right bit 0 A rectangle is used to represent each bit Each bit is labeled with a name inside its rectangle An asterisk after the bit name indicates that the bit is inverted negative logic The Module ID register has a unique...

Page 81: ...significant byte first Within each byte data is sent out most significant bit first Additional data transfers will result in all zeros being sent on the MISO line The Module ID Register is reinitialized to its original value each time the SCXI 1121 is deselected by the SS signal on the backplane Type Read only Word Size 4 byte Bit Map Byte 0 Byte 1 Byte 2 Byte 3 7 6 5 4 3 2 1 0 0 0 0 0 0 0 1 0 7 6...

Page 82: ...nal If CLKOUTEN is set to 1 SCANCLK is transmitted on TRIG0 If CLKOUTEN is cleared to 0 SCANCLK is not transmitted on TRIG0 14 CLKSELECT Scanclock Select This bit determines whether the SCXI 1121 uses SCANCLK or the inverted form of TRIG0 to clock the MUXCOUNTER for the purpose of scanning through the analog channels If CLKSELECT is cleared to 0 SCANCLK is used to clock MUXCOUNTER If CLKSELECT is ...

Page 83: ...COUNTER will increment on each clock signal the clock source is determined by CLKSELECT or keep its loaded value If SCANCLKEN is set to one MUXCOUNTER will be clocked during scans If SCANCLKEN is cleared to zero MUXCOUNTER will not be clocked 2 SCANCONEN Scan Control Enable This bit when high enables the SCANCON signal 1 AB0EN Analog Bus 0 Enable This bit determines whether Analog Bus 0 on the SCX...

Page 84: ...n 8 bit write only register used for setting up the timing circuitry in Slot 0 The Slot Select Register is written to by using the SLOT0SEL line The HSCR and the FIFO Register are written to as if they were registers located on modules in Slots 13 and 14 It is recommended that you maintain software copies of the Slot Select Register HSCRs and all the Slot 0 scan lists that correspond to the writes...

Page 85: ...mber written The Slot Select Register will shift in the data present on the MOSI line bit 16 first when SLOT0SEL is cleared to zero Type Write only Word Size 16 bit Bit Map Bit Name Description 15 9 X Don t care bits 8 4 CHS 4 0 Chassis Bit 4 through 0 These bits determine which chassis is selected On the SCXI 1000 chassis these bits are don t cares 3 0 SL 3 0 Slot Bit 3 through 0 These bits deter...

Page 86: ...e reprogrammed in two steps instead of having to rewrite the entire list When this bit is set it has no effect 5 RD Read This bit when clear prevents the FIFO from being read When set the FIFO is being read except at the end of a scan list entry during scanning when reading is briefly disabled to advance to the next scan list entry 4 ONCE Once When set this bit will cause the Hardscan circuitry to...

Page 87: ... 4 8 ni com 1 SCANCONEN Scan Control Enable When set this bit enables the SCANCON lines When clear all SCANCON lines are disabled high 0 CLKEN Clock Enable When set this bit enables TRIG0 as a clock for the hardscan circuitry When clear TRIG0 is disabled ...

Page 88: ...ter The Slot 0 scan list is created by consecutive writes to the FIFO Register Each write creates a new entry at the end of the scan list The maximum number of entries is 256 To clear the FIFO of all entries clear the HSRS bit in the HSCR Type Write only Word Size 16 bit Bit Map Bit Name Description 15 11 X Don t care bits Unused 10 7 MOD 3 0 Module Number The value of these bits plus on determine...

Page 89: ...programming instructions list the sequence of steps to take The instructions are language independent that is they instruct you to write a value to a given register without presenting the actual code Notation For the bit patterns to be written the following symbols are used 0 Binary zero 1 Binary one X Don t care either zero or one may be written C One of two bits used to specify the channel to be...

Page 90: ...registers to determine which bits have been set or cleared in the past therefore you should maintain a software copy of these registers You can then read the software copy to determine the status of the register To change the state of a single bit without disturbing the remaining bits set or clear the bit in the software copy and write the software copy to the register Register Selection and Write...

Page 91: ...a Configuration Register clear DAQD A to 0 this indicates data will be written to the Configuration Register If you are writing to the HSCR or FIFO Register leave DAQD A high 6 For each bit to be written to the Configuration Register a Establish the desired SERDATIN level corresponding to this bit b Clear SERCLK to 0 c Set SERCLK to 1 clock the data If you are using an MIO 16 board writing to the ...

Page 92: ... voltage measurement with your data acquisition board consult your data acquisition board user manual Remember to account for the gains of both the SCXI 1121 and the data acquisition board when calculating the actual voltage present at the input of the SCXI 1121 To measure one of the four differential input channels to the SCXI 1121 or the DTEMP line if the module has been configured appropriately...

Page 93: ...ter 2 Measure the voltage with the data acquisition board Indirect Measurements Indirect measurements involve one module sending a signal to Analog Bus 0 where it is picked up by another module and transmitted to the data acquisition board Measurements from Other Modules To perform measurements from other modules you must cable the SCXI 1121 rear signal connector to a data acquisition board Refer ...

Page 94: ...ifferential input channels of the SCXI 1121 perform the following steps 1 Perform any necessary programming to ensure that no modules are driving Analog Bus 0 For an SCXI 1121 clearing AB0EN in the Configuration Register will ensure that its output is not driving AB0 2 Program the other module not to drive Analog Bus 0 but to send Analog Bus 0 to the data acquisition board 3 Write the binary patte...

Page 95: ... support any of the multiplexed scanning modes Notice that single module parallel scanning is typically done without any module or Slot 0 programming only programming the data acquisition board is necessary 1 Data Acquisition Board Setup Programming The programming steps for your data acquisition board are given in your data acquisition board user manual You should follow the instructions in the f...

Page 96: ...Lab PC User Manual Programming Multiple A D Conversions with Channel Scanning Programming Multiple A D Conversions with Interval Scanning Programming Multiple A D Conversions in Single Channel Interval Acquisition Mode MC MIO 16 User Manual Multiple A D Conversions with Continuous Channel Scanning Round Robin Multiple A D Conversions with Interval Channel Scanning Pseudosimultaneous NB MIO 16 User...

Page 97: ... 0 Clear the A D Circuitry in the Lab LC User Manual Do not continue to the part called Program the Sample Interval Counter You will do this after you program the modules and Slot 0 Clear the A D Circuitry in the Lab PC User Manual the Lab PC User Manual and the PC LPM 16 User Manual Do not continue to the part called Start and Service the Data Acquisition Operation You will do this after you prog...

Page 98: ... Load Register 4 Write the number of samples to be taken per scan list entry 2 to 65 535 to the Am9513 Data Register to load Counter 1 5 Write FF41 to the Am9513 Command Register to load Counter 1 6 Write FFF1 to the Am9513 Command Register to step Counter 1 7 Write FF21 to the Am9513 Command Register to arm Counter 1 8 Set the SCANDIV bit in Command Register 1 2 Module Programming This section de...

Page 99: ...rite the binary pattern 10ScXXXCC XX001101 to the SCXI 1121 Configuration Register CC represents the starting channel number Single Module Multiplexed Scanning Indirect To indirectly scan a module send the output of the scanned module onto Analog Bus 0 where it will be picked up by another module and transmitted to the data acquisition board Channel Scanning from Other Modules To scan measurements...

Page 100: ...ion board and the module must be able to transfer Analog Bus 0 to the data acquisition board This module must also be able to send a SCANCLK compatible signal on TRIG0 Refer to Chapter 2 Configuration and Installation for more information The module programming steps are as follows 1 Perform any necessary programming to ensure that no modules are driving Analog Bus 0 For an SCXI 1121 clearing AB0E...

Page 101: ... be involved For example you want to scan thirteen modules Twelve modules are in one chassis The thirteenth is in the second chassis and is to be scanned through a fourteenth module that is cabled to the data acquisition board but is not involved in the scan Program the twelve modules in the first chassis according to the steps in the previous Multiple Module Multiplexed Scanning section and progr...

Page 102: ...o shut down after a single scan When you are writing multiple entries to the same register for example repetitive writes to the HSCR or several FIFO entries it is important that SS 13 or SS 14 go inactive high between each entry Select another slot or toggle the SLOT0SEL line to temporarily deassert the appropriate SS line If consecutive scan list entries access an SCXI 1121 the module will reload...

Page 103: ...ration Lab NB User Manual Program the sample interval counter Counter A0 Service the data acquisition operation Scanning Examples The following examples are intended to aid your understanding of module and Slot 0 programming It will be helpful to refer to the bit descriptions for the Configuration Register and the FIFO Register at the beginning of Chapter 4 Register Descriptions Example 1 You want...

Page 104: ...ter Writes section write 00000000 00000000 to the Configuration Register of the SCXI 1121 in Slot 2 This step resets the module including the clearing of the AB0EN bit bit 0 Notice that a complete reset of this module is not necessary but is used for simplicity 3 Following the procedure given in the Register Writes section write 100XXX00 00001111 to the Configuration Register of the SCXI 1121 in S...

Page 105: ...sis 3 and three channels of an SCXI 1121 in Slot 8 of Chassis 3 Assuming that the modules are cabled and programmed correctly the Slot 0 scan lists should be as follows Other solutions are possible In the 3 Programming the Slot 0 Hardscan Circuitry section earlier in this chapter step 3 Write the Slot 0 scan list to the FIFO consists of the following steps 1 Select Slot 14 in Chassis 1 2 Write XXX...

Page 106: ...i com 10 Write XXXXX110 00000011 over MOSI 11 Select Slot 14 in Chassis 3 12 Write XXXXX110 00000101 over MOSI 13 Toggle SLOT0SEL 14 Write XXXXX001 00000000 over MOSI 15 Toggle SLOT0SEL 16 Write XXXXX011 10000010 over MOSI 17 Select Slot 0 in Chassis 0 ...

Page 107: ...00 200 500 1 000 2 000 Output range 5 V Number of channels 4 Gain accuracy1 0 15 of full scale Offset voltage Input 6 µV Output 3 mV Stability versus ambient temperature Input offset drift 0 2 µV C Output offset drift 200 µV C Gain drift 20 ppm C Input bias current 80 pA Input resistance Normal 1 GΩ Power off 50 kΩ Overload 50 kΩ Output resistance Multiplexed Output mode 100 Ω Parallel Output mode...

Page 108: ...l 7 µsec maximum 0 006 accuracy 10 µsec 0 0015 accuracy 20 µsec Rise time 4 Hz 0 12 sec 10 kHz 70 µsec Slew rate 0 15 V µsec Common mode rejection ratio 50 or 60 Hz 1 kΩ in input leads 160 dB minimum at 4 Hz bandwidth NMR 50 or 60 Hz 60 dB at 4 Hz bandwidth Input protection continuous 250 Vrms maximum Output protection Continuous short to ground Power dissipation 7 5 W maximum RTD Mode Excitation ...

Page 109: ... 0 to 15 and 35 to 55 C Output 1 91 to 0 58 V from 0 to 55 C Output at 25 C 1 25 V Note You can find the temperature T C as follows T TK 273 15 1 NI calibrates the excitation voltage by using a 120 Ω load resistor that is connected to the excitation voltage output through the SCXI 1320 terminal block The excitation voltage values are measured at the output screw terminals of the SCXI 1320 terminal...

Page 110: ...f the temperature sensor Physical Dimensions 3 0 cm 17 2 cm 18 8 cm 1 2 in 6 8 in 7 4 in Weight 667 3 g 23 5 oz Connectors 50 pin male ribbon cable rear connector 32 pin DIN C front connector 18 screw terminal adapter available Environment Operating Temperature 0 to 50 C Storage Temperature 20 to 70 C Relative humidity 10 to 90 noncondensing TK 1 a b RT ln c RT ln 3 RT 50000 VTEMPOUT 2 5 VTEMPOUT ...

Page 111: ...Electromagnetic Compatibility This product meets the requirements of the following EMC standards for electrical equipment for measurement control and laboratory use EN 61326 IEC 61326 Class A emissions Basic immunity EN 55011 CISPR 11 Group 1 Class A emissions AS NZS CISPR 11 Group 1 Class A emissions FCC 47 CFR Part 15B Class A emissions ICES 001 Class A emissions Note For the standards applied t...

Page 112: ...nal environmental information refer to the NI and the Environment Web page at ni com environment This page contains the environmental regulations and directives with which NI complies as well as other environmental information not included in this document Waste Electrical and Electronic Equipment WEEE EU Customers At the end of the product life cycle all products must be sent to a WEEE recycling ...

Page 113: ...ction Figure B 1 shows the pin assignments for the SCXI 1121 rear signal connector Figure B 1 SCXI 1121 Rear Signal Connector Pin Assignment RSVD SERCLK DIG GND SLOT0SEL DAQD A SERDATIN OUTREF MCH4 MCH3 MCH2 MCH1 MCH0 AOGND SCANCLK SERDATOUT DIG GND MCH4 MCH3 MCH2 MCH1 MCH0 AOGND 49 50 47 48 45 46 43 44 41 42 39 40 37 38 35 36 33 34 31 32 29 30 27 28 25 26 23 24 21 22 19 20 17 18 15 16 13 14 11 12...

Page 114: ...D Digital Ground These pins supply the reference for data acquisition board digital signals and are tied to the module digital ground 25 SERDATIN Serial Data In This signal taps into the SCXIbus MOSI line to provide serial input data to a module or Slot 0 26 SERDATOUT Serial Data Out This signal taps into the SCXIbus MISO line to accept serial output data from a module 27 DAQD A Data Acquisition B...

Page 115: ...l Instruments Corporation C 1 SCXI 1121 User Manual C SCXIbus Connector This appendix describes the pinout and signal names for the SCXI 1121 96 pin SCXIbus connector including a description of each connection ...

Page 116: ...7 B17 A18 B18 A19 B19 A20 B20 A21 B21 A22 B22 A23 B23 A24 B24 D1 C1 D2 C2 D3 C3 D4 C4 D5 C5 D6 C6 D7 C7 D8 C8 D9 C9 D10 C10 D11 C11 D12 C12 D13 C13 D14 C14 D15 C15 D16 C16 D17 C17 D18 C18 D19 C19 D20 C20 D21 C21 D22 C22 D23 C23 D24 C24 GUARD GUARD GUARD AB0 GUARD GUARD GUARD GUARD GUARD GUARD RESET MISO V V CHSGND CHSGND V V 5 V SPICLK TRIG0 SS GUARD GUARD GUARD GUARD GUARD GUARD GUARD GUARD AB0 C...

Page 117: ...ow reinitializes the module to its power up state Totem pole Input B19 MISO Master In Slave Out Transmits data from the module to the SCXIbus Open collector I O C19 D A Data Address Indicates to the module whether address information or data information is being sent to the module on MOSI Open collector I O D19 INTR Interrupt Active low Causes data that is on MOSI to be written to the Slot Select ...

Page 118: ...y the SCXI 1121 to send SCANCLK to other modules or receive SCANCLK from other modules Open collector I O B24 SS Slot Select When low enables module communications over the SCXIbus Totem pole Input C24 SCANCON Scanning Control Combination output enable and reload signal for scanning operations Totem pole Input Note All other pins are not connected Pin Signal Name Description ...

Page 119: ...al Instruments Corporation D 1 SCXI 1121 User Manual D SCXI 1121 Front Connector This appendix describes the pinout and signal names for the SCXI 1121 front connector including a description of each connection ...

Page 120: ...front connector Figure D 1 SCXI 1121 Front Connector Pin Assignment Pin Number Signal Name Column A B C Signal Name 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 CGND 5 V EGND2 EX1 EGND3 EX3 CH3 EX2 CH2 EGND1 CH1 EGND0 EX0 EX3 CH3 EX2 DTEMP MTEMP CH2 EX1 CH1 EX0 CH0 CH0 SCAL RSVD RSVD ...

Page 121: ... 1321 shunt calibration switch CMOS TTL output not protected C6 C8 RSVD Reserved These pins are reserved Do not connect any signal to these pins A8 C10 C16 C22 C28 No Connect Do not connect any signal to these pins A10 EGND3 Excitation Ground 3 This pin connects to the excitation ground 3 via a 51 kΩ resistor A12 EX3 Positive Excitation Output 3 This pin is connected to the excitation channel 3 po...

Page 122: ...sitive output C24 EX1 Negative Excitation Output 1 This pin is connected to the excitation channel 1 negative output A26 CH1 Positive Input Channel 1 This pin is connected to the input channel 1 positive input C26 CH1 Negative Input Channel 1 This pin is connected to the input channel 1 negative input A28 EGND0 Excitation Ground 0 This pin connects to the excitation ground 0 via a 51 kΩ resistor A...

Page 123: ...e connector at the other end The female connector connects to the I O connector of the MIO 16 board Attached to the mounting bracket is a 50 pin female mounting bracket connector that connects to the module rear signal connector To extend the signals of the MIO 16 board to an SCXI 1180 feedthrough panel or an SCXI 1181 breadboard module you can use the male breakout connector that is near the moun...

Page 124: ...onnection to the MIO 16 board The SCXI 1340 rear panel gives the module and the chassis both mechanical and electrical shielding Table E 1 lists the pin equivalences of the MIO 16 and the SCXI 1121 Table E 1 SCXI 1121 and MIO 16 Pinout Equivalences Pin SCXI 1121 Rear Signal Connector MIO 16 Equivalent 1 2 AOGND AIGND 3 MCH 0 ACH0 4 MCH 0 ACH8 5 MCH 1 ACH1 6 MCH1 ACH9 7 MCH2 ACH2 8 MCH2 ACH10 9 MCH...

Page 125: ...the chassis 4 Screw the mounting bracket to the threaded strips in the rear of the chassis 5 Connect the loose end of the cable assembly to the MIO 16 board rear signal connector 6 Check the installation After step 1 the order of these steps is not critical however it is easier to locate the correct position for the mounting bracket with a module installed in the chassis If you will attach a cable...

Page 126: ... rear connector of the adapter board The adapter board converts the signals from the Lab board I O connectors to a format compatible with the SCXI 1121 rear signal connector pinout at the front connector of the SCXI 1341 or SCXI 1344 The adapter board also has an additional male breakout connector that makes the unmodified Lab board signals accessible to an SCXI 1180 feedthrough panel or an SCXI 1...

Page 127: ... the board for single ended inputs Table E 2 SCXI 1341 and SCXI 1344 Pin Translations Lab Board Pin Lab Board Signal SCXI 1121 Pin SCXI 1121 Signal 1 ACH0 3 MCH0 2 ACH1 5 MCH1 3 ACH2 7 MCH2 4 ACH3 9 MCH3 5 ACH4 11 MCH4 6 ACH5 13 No Connect 7 ACH6 15 No Connect 8 ACH7 17 No Connect 9 AIGND 1 2 AOGND 10 DAC0OUT 20 No Connect 11 AOGND 23 No Connect 12 DAC1OUT 21 No Connect 13 50 DGND 24 33 DIG GND 26...

Page 128: ...ors to the Lab LC according to the instructions given in the Hardware Installation section of Chapter 2 Configuration and Installation of the Lab LC User Manual 7 Check the installation SCXI 1342 PC LPM 16 Cable Assembly The SCXI 1342 PC LPM 16 cable assembly connects a PC LPM 16 board to an SCXI 1121 module The SCXI 1342 cable assembly consists of two pieces an adapter board and a 50 conductor ri...

Page 129: ...ions PC LPM 16 Pin PC LPM 16 Signal Rear Signal Connector Pin SCXI 1121 Use 1 2 AIGND 1 2 AOGND 3 ACH0 3 MCH0 4 ACH8 4 MCH0 5 ACH1 5 MCH1 6 ACH9 6 MCH1 7 ACH2 7 MCH2 8 ACH10 8 MCH2 9 ACH3 9 MCH3 10 ACH11 10 MCH3 11 ACH4 11 MCH4 12 ACH12 12 MCH4 13 ACH5 13 No Connect 14 ACH13 14 No Connect 15 ACH6 15 No Connect 16 ACH14 16 No Connect 17 ACH7 17 No Connect 18 ACH15 18 No Connect 19 50 DGND 24 33 DIG...

Page 130: ... SCXI 1180 feedthrough panel provides front panel access to the signals of any data acquisition board that uses a 50 pin I O connector The SCXI 1180 consists of a front panel with a 50 pin male front panel connector that occupies one slot in the SCXI chassis and a ribbon cable with a female rear connector and a male breakout connector You can attach the rear connector to the male breakout connecto...

Page 131: ...e slot where you will insert the SCXI 1180 3 Thread the rear connector through the front of the chassis to the rear of the chassis Attach the rear connector to the breakout connector of the adjacent cable assembly or slot extender as shown in Figure E 2 Figure E 2 SCXI 1180 Rear Connections 4 Screw in the rear panel to the threaded strip in the rear of the chassis 5 Screw the front panel into the ...

Page 132: ...ect all the wiring and replace the cover The procedure for this is as follows 1 Unscrew the rear grounding screw on the back of the terminal block as shown in Figure E 4 2 With a flathead screwdriver carefully pry the cover off the terminal block 3 Insert each wire through the terminal block strain relief opening 4 Connect the wires to the screw terminals 5 Tighten the large strain relief screws t...

Page 133: ...stallation section 2 Wire the terminal block as described in the SCXI 1302 Wiring Procedure section 3 Connect the SCXI 1302 terminal block to the front panel connector on the SCXI 1180 feedthrough panel Be careful to fit the thumbscrews in the thumbscrew cutouts 4 Tighten the top and bottom captive screws on the back of the terminal block into the screw holes in the front panel This will hold the ...

Page 134: ...o the breakout connector in the adjacent slot This attachment is similar to step 3 in the SCXI 1180 Installation section as shown in Figure E 2 4 Plug the mounting bracket connector to the module rear signal connector Make sure the alignment tab on the bracket enters the upper board guide of the chassis 5 Screw the mounting bracket to the threaded strips in the rear of the chassis 6 Check the inst...

Page 135: ...ibbon cable to the MIO board 4 Connect the other end of the ribbon cable to the rear connector of the first SCXI 1350 5 Connect another ribbon cable or cable assembly to the chassis extender connector 6 Plug the adapter board front connector to the module rear signal connector Make sure a corner of the adapter board enters the upper board guide of the chassis 7 Screw the rear panel to the threaded...

Page 136: ...e adapter board enters the upper board guide of the chassis 6 Screw the rear panel to the threaded strips in the rear of the chassis Table E 4 SCXI 1343 Pin Connections Rear Signal Connector Pin SCXI 1121 Use Connection Type 1 AOGND Solder pad 2 AOGND Screw terminal 3 MCH0 Screw terminal 4 MCH0 Screw terminal 5 MCH1 Screw terminal 6 MCH1 Screw terminal 7 MCH2 Screw terminal 8 MCH2 Screw terminal 9...

Page 137: ...A Solder pad 28 No Connect Solder pad 29 SLOT0SEL Solder pad 30 No Connect Solder pad 31 No Connect Solder pad 32 No Connect Solder pad 33 No Connect Solder pad 34 35 No Connect Solder pad 36 SCANCLK Solder pad 37 SERCLK Solder pad 38 No Connect Solder pad 39 No Connect Solder pad 40 No Connect Solder pad 41 No Connect Solder pad 42 No Connect Solder pad 43 RSVD Solder pad 44 No Connect Solder pad...

Page 138: ...ni com 45 No Connect Solder pad 46 No Connect Solder pad 47 No Connect Solder pad 48 No Connect Solder pad 49 No Connect Solder pad 50 No Connect Solder pad Table E 4 SCXI 1343 Pin Connections Continued Rear Signal Connector Pin SCXI 1121 Use Connection Type ...

Page 139: ... a photograph of the Revision A and B SCXI 1121 signal conditioning module and the general and detailed parts locator diagrams Figure F 1 shows the SCXI 1121 module Figures F 2 and F 3 show the general and detailed parts locator diagrams of the Revision A and B SCXI 1121 Figure F 1 Revision A and B SCXI 1121 Signal Conditioning Module ...

Page 140: ...Appendix F Revision A and B Photo and Parts Locator Diagrams SCXI 1121 User Manual F 2 ni com Figure F 2 Revision A and B SCXI 1121 General Parts Locator Diagram ...

Page 141: ...Appendix F Revision A and B Photo and Parts Locator Diagrams National Instruments Corporation F 3 SCXI 1121 User Manual Figure F 3 Revision A and B SCXI 1121 Detailed Parts Locator Diagram ...

Page 142: ...M mega 106 Numbers Symbols degrees Ω ohms ε strain 5 V signal 5 VDC source signal A A amperes A D analog to digital AB0 negative analog bus 0 line signal AB0 positive analog bus 0 line signal AB0EN analog bus 0 enable bit AB2 negative analog bus 2 line signal AB2 positive analog bus 2 line signal ACH data acquisition board analog input channel number ...

Page 143: ...nnel number signal CH positive input channel number signal CHAN channel select bit CHS chassis bit CHSGND chassis ground signal CJR cold junction reference CLKEN clock enable bit CLKOUTEN scanclock output enable bit CLKSELECT scanclock select bit CNT count bit D D A digital to analog D A data address line signal DAQD A data acquisition board data address line signal dB decibels ...

Page 144: ...perature sensor DTS direct temperature sensor E EGND excitation ground number signal EX negative excitation output number signal EX positive excitation output number signal F F Fahrenheit FIFO first in first out FOUTEN forced output enable bit FRT forced retransmit bit G GBWP gain bandwidth product GUARD guard signal H hex hexadecimal HSCR hardscan control register ...

Page 145: ...inches INTR interrupt signal K K kelvin L LOAD load bit LSB least significant bit M m meters M megabytes of memory MCH negative analog output channel number signal MCH positive analog output channel number signal MISO master in slave out signal MOD module number bit MOSI master out slave in signal MSB most significant bit ...

Page 146: ...gle ended input O ONCE once bit OUTREF output reference signal P ppm parts per million R RAM random access memory RD read bit RESET reset signal rms root mean square RSE referenced single ended input RSVD reserved bit signal RTD resistance temperature detector RTEMP read temperature bit RTI referred to input RTO referred to output RTSI real time system integration ...

Page 147: ...an control enable bit SCXI Signal Conditioning eXtensions for Instrumentation bus SDK software developer s kit sec seconds SERCLK serial clock signal SERDATIN serial data in signal SERDATOUT serial data out signal SL slot bit SLOT0SEL slot 0 select signal SPI serial peripheral interface SPICLK serial peripheral interface clock signal SS slot select signal T tempco temperature coefficient TRIG0 tri...

Page 148: ...er Manual U UL Underwriters Laboratory V V volts V negative analog supply signal V positive analog supply signal VDC volts direct current VIH volts input high VIL volts input low VOH volts output high VOL volts output low Vrms volts root mean square W W watts ...

Page 149: ...nal half bridge completion 2 13 grounding shielding and reference mode selection 2 7 input channel jumpers excitation jumpers 2 10 filter jumpers 2 10 gain jumpers 2 9 jumper W33 2 7 analog input channels block diagram 3 9 signal connections AC coupled with high common mode voltage figure 2 20 exceeding input range and common mode input range caution 2 21 floating AC coupled figure 2 20 floating r...

Page 150: ...t 0 2 42 writing to Configuration Register 2 43 completion network jumpers table 2 13 configuration analog excitation jumpers 2 10 filter jumpers 2 10 gain jumpers 2 9 grounding shielding and reference mode selection 2 7 input channel jumpers 2 9 jumper W33 2 7 digital signal connections jumper settings table 2 6 jumper W32 2 5 jumper W38 2 5 jumper W44 2 4 using jumpers W32 and W38 2 5 excitation...

Page 151: ...ivalents table 2 40 specifications and ratings 2 40 timing signals 2 40 using jumpers W32 and W38 2 5 direct measurements single channel multiplexed output 5 4 parallel output 5 4 single channel measurements 5 4 direct multiplexed scanning single module 5 11 documentation conventions used in manual xi NI resources G 1 related documentation xii drivers NI resources G 1 DTEMP signal table 2 17 D 3 D...

Page 152: ...e 2 19 GUARD signal table 3 4 C 3 H half bridge completion completion network jumpers table 2 13 using internal half bridge completion 2 13 Hardscan Control Register HSCR description 4 7 register writes 5 1 hardware installation 2 14 help technical support G 1 HSRS bit 4 7 I indirect measurements single channel from other modules 5 5 from SCXI 1121 via another module 5 6 indirect multiplexed scann...

Page 153: ...320 terminal block table 2 31 SCXI 1328 terminal block table 2 31 W2 nulling circuit setting table 2 27 W3 table 2 28 W32 configuration 2 5 description 2 5 settings table 2 7 W33 2 7 W38 configuration 2 5 description 2 5 settings table 2 6 W4 table 2 28 W44 configuration 2 4 settings table 2 7 W45 table 2 6 W5 table 2 32 K KnowledgeBase G 1 L LabVIEW for Macintosh software 1 3 LabVIEW for Windows ...

Page 154: ... range 2 26 jumper settings table 2 27 nulling resistors and corresponding channel table 2 25 trimmer potentiometer and corresponding channel table 2 25 O offset null terminal block See SCXI 1321 terminal block ONCE bit 4 7 operation of SCXI 1121 See theory of operation optional equipment table 1 4 software 1 2 OUTREF signal table 2 37 B 2 P parallel output single channel measurements 5 4 parallel...

Page 155: ... another module 5 6 indirect measurements 5 5 multiplexed output 5 4 parallel output 5 4 programming examples NI resources G 1 programming languages SCXI 1121 support for 1 3 R RD bit 4 7 rear signal connector analog output 2 38 communication signals 2 41 digital I O 2 39 pin assignments figure 2 36 B 1 SCXIbus to SCXI 1121 to DAQ board pin equivalences table 2 40 signal descriptions table 2 37 B ...

Page 156: ...ltiple chassis scanning 5 13 multiple module multiplexed scanning 5 12 single module multiplexed scanning direct 5 11 indirect 5 11 single module parallel scanning 5 11 Slot 0 hardscan circuitry 5 13 scanning modes analog output circuitry 3 12 multiple chassis scanning 3 17 multiple module multiplexed scanning 3 16 multiplexed scanning 3 14 single module multiplexed scanning 3 15 single module par...

Page 157: ... signal connections 2 32 temperature sensor 2 29 trimmer potentiometer and corresponding channel table 2 25 using with RTDs and thermistors 2 27 SCXI 1328 terminal block See SCXI 1320 and SCXI 1328 terminal block SCXI 1340 cable assembly description E 1 installation E 3 SCXI 1121 and MIO 16 pinout equivalences table E 2 SCXI 1341 Lab NB Lab PC or Lab PC cable assembly description E 4 installation ...

Page 158: ...23 signal descriptions table 2 17 D 3 temperature sensor connection 2 21 rear signal connector analog output 2 38 communication signals 2 41 digital I O 2 39 pin assignments figure 2 36 B 1 signal description table 2 37 B 2 timing requirements and communication protocol 2 40 safety precautions 2 15 SCXIbus connector equivalents for rear signal connector table 3 5 pin assignments figure 3 3 C 2 sig...

Page 159: ...cuitry analog input channels 3 8 analog output circuitry 3 12 excitation output channels 3 11 block diagram of SCXI 1121 3 1 digital control circuitry 3 7 digital interface 3 6 major components of SCXI 1121 3 2 scanning modes multiple chassis scanning 3 17 multiple module multiplexed scanning 3 16 multiplexed scanning 3 14 single module multiplexed scanning 3 15 single module parallel scanning 3 1...

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