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Theory of Operation

Chapter 3

SCXI-1120 User Manual

3-2

© National Instruments Corporation

The major components of the SCXI-1120 are as follows:

•

SCXIbus connector

•

Digital interface

•

Digital control circuitry

•

Timing and analog circuitry

The SCXI-1120 consists of eight isolated amplifier channels with gains of 1, 2, 5, 10, 20, 50,
100, 200, 500, 1,000, and 2,000.  The SCXI-1120 also has a digital section for automatic control
of channel scanning, temperature selection, and MUXCOUNTER clock selection.

The theory of operation of each of these components is explained in the rest of this chapter.

SCXIbus Connector

Figure 3-2 shows the pinout of the SCXIbus connector.

Содержание SCXI-1120

Страница 1: ...opyright 1992 1994 National Instruments Corporation All Rights Reserved SCXI 1120 User Manual Eight Channel Isolated Analog Input Module for Signal Conditioning August 1994 Edition Part Number 320425B 01 ...

Страница 2: ...fices Australia 03 879 9422 Austria 0662 435986 Belgium 02 757 00 20 Canada Ontario 519 622 9310 Canada Québec 514 694 8521 Denmark 45 76 26 00 Finland 90 527 2321 France 1 48 14 24 24 Germany 089 741 31 30 Italy 02 48301892 Japan 03 3788 1921 Netherlands 03480 33466 Norway 32 848400 Spain 91 640 0085 Sweden 08 730 49 70 Switzerland 056 20 51 51 U K 0635 523545 ...

Страница 3: ...brought within one year after the cause of action accrues National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control The warranty provided herein does not cover damages defects malfunctions or service failures caused by owner s failure to follow the National Instruments installation operation or maintenance instructions owner s modification of...

Страница 4: ...42 and W43 2 5 Analog Configuration 2 7 Grounding Shielding and Reference Mode Selection 2 7 Jumper W46 2 7 Direct Temperature Connection 2 8 Jumper 41 2 8 Gain Jumpers 2 9 Filter Jumpers 2 10 Hardware Installation 2 11 Signal Connections 2 11 Front Connector 2 12 Front Connector Signal Descriptions 2 13 Analog Input Channels 2 13 Temperature Sensor Connection 2 15 Connector and Shell Assembly 2 1...

Страница 5: ...cuitry 3 12 Scanning Modes 3 13 Single Module Parallel Scanning 3 14 Multiplexed Scanning 3 14 Single Module Multiplexed Scanning 3 14 Single Module Multiplexed Scanning Direct 3 14 Single Module Multiplexed Scanning Indirect 3 15 Multiple Module Multiplexed Scanning 3 15 Multiple Chassis Scanning 3 16 Chapter 4 Register Descriptions 4 1 Register Description 4 1 Register Description Format 4 1 SCX...

Страница 6: ... Indirect 5 9 Channel Scanning from Other Modules 5 9 Channel Scanning From the SCXI 1120 via Another Module 5 9 Multiple Module Multiplexed Scanning 5 9 Multiple Chassis Scanning 5 10 3 Programming the Slot 0 Hardscan Circuitry 5 10 4 Acquisition Enable Triggering and Servicing 5 12 Scanning Examples 5 12 Example 1 5 12 Example 2 5 13 Example 3 5 14 Appendix A Specifications A 1 Analog Input A 1 ...

Страница 7: ...XI 1342 Installation E 6 SCXI 1180 Feedthrough Panel E 6 SCXI 1180 Installation E 6 SCXI 1302 50 Pin Terminal Block E 8 SCXI 1302 Wiring Procedure E 8 SCXI 1302 Installation E 9 SCXI 1351 One Slot Cable Extender E 9 SCXI 1351 Installation E 10 SCXI 1350 Multichassis Adapter E 10 SCXI 1350 Installation E 10 SCXI 1343 Rear Screw Terminal Adapter E 11 SCXI 1343 Installation E 11 Appendix F Revision A...

Страница 8: ...ter Write Timing Diagram 2 31 Figure 2 16 SCXI 1120 Module ID Register Timing Diagram 2 31 Figure 3 1 SCXI 1120 Block Diagram 3 1 Figure 3 2 SCXIbus Connector Pin Assignment 3 3 Figure 3 3 Digital Interface Circuitry Block Diagram 3 6 Figure 3 4 SCXI 1120 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...

Страница 9: ... Block 2 19 Table 2 8 Jumper Settings on the SCXI 1328 Terminal Block 2 20 Table 2 9 SCXIbus to SCXI 1120 Rear Signal Connector to Data Acquisition Board Pin Equivalences 2 27 Table 3 1 SCXIbus Equivalents for the Rear Signal Connector 3 5 Table 3 2 Calibration Potentiometers Reference Designators 3 12 Table 5 1 SCXI 1120 Rear Signal Connector Pin Equivalences 5 2 Table E 1 SCXI 1120 and MIO 16 Bo...

Страница 10: ...nual The SCXI 1120 User Manual is organized as follows Chapter 1 Introduction describes the SCXI 1120 lists the contents of your SCXI 1120 kit describes the optional software optional equipment and custom cables and explains how to unpack the SCXI 1120 kit Chapter 2 Configuration and Installation describes the SCXI 1120 jumper configurations installation of the SCXI 1120 into the SCXI chassis sign...

Страница 11: ...d each one Conventions Used in This Manual The following conventions are used in this manual italic Italic text denotes emphasis a cross reference or an introduction to a key concept Lab board Lab board refers to the Lab LC Lab NB Lab PC and Lab PC boards unless otherwise noted MC MC refers to the Micro Channel series computers MIO board MIO board refers to the AT MIO 16 AT MIO 16D AT MIO 16F 5 AT...

Страница 12: ...sary Related Documentation The following documents contain information that you may find helpful as you read this manual Your DAQ board user manual Your SCXI chassis user manual Customer Communication National Instruments wants to receive your comments on our products and manuals We are interested in the applications you develop with our products and we want to help if you have problems with them ...

Страница 13: ...The SCXI 1120 operates with full functionality with the National Instruments MIO 16 boards You can use the Lab NB the Lab PC the Lab PC the Lab LC and the PC LPM 16 boards with the SCXI 1120 but these boards 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 1120 with other systems th...

Страница 14: ...alled from your application programming environment These functions include routines for analog input A D conversion buffered data acquisition high speed A D conversion analog output D A conversion waveform generation digital I O counter timer SCXI RTSI and self calibration NI DAQ maintains a consistent software interface among its different versions so you can switch between platforms with minima...

Страница 15: ... 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 cable 776574 471 776574 472 776574 475 776574 47...

Страница 16: ...acturer part number used by National Instruments for this connector is as follows Panduit Corporation part number 100 932 023 The mating connector for the SCXI 1120 front connector is a 32 pin DIN C female connector National Instruments uses a polarized connector to prevent inadvertent upside down connection to the SCXI 1120 Recommended manufacturer part numbers for this mating connector are as fo...

Страница 17: ...llation This chapter describes the SCXI 1120 jumper configurations installation of the SCXI 1120 into the SCXI chassis signal connections to the SCXI 1120 and cable wiring Module Configuration The SCXI 1120 includes 46 jumpers that are shown in the parts locator diagrams in Figures 2 1 and 2 2 ...

Страница 18: ...Configuration and Installation Chapter 2 SCXI 1120 User Manual 2 2 National Instruments Corporation Figure 2 1 SCXI 1120 General Parts Locator Diagram ...

Страница 19: ...pter 2 Configuration and Installation National Instruments Corporation 2 3 SCXI 1120 User Manual Figure 2 2 shows a detailed parts locator diagram of the SCXI 1120 Figure 2 2 Detailed Parts Locator Diagram ...

Страница 20: ...the guard the analog output ground and enables the Pseudodifferential Reference mode Jumpers W1 through W8 configure the first stage gain of channels 0 through 7 respectively Jumpers W9 through W16 configure the second stage gain of channels 0 through 7 respectively Jumpers W17 through W24 configure the first stage filtering of input channels 0 through 7 respectively Jumpers W25 through W40 config...

Страница 21: ... O connector Position 3 disconnects SERDATOUT from the SCXIbus MISO line Jumper W42 On Revision A and B modules jumper W42 should not be connected On Revision C and later modules position 1 connects a 2 2 kΩ pullup resistor to the SERDATOUT line Position 3 does not connect the pullup resistor to the SERDATOUT line Using Jumpers W42 and W43 If the SCXI 1120 is not cabled to a data acquisition board...

Страница 22: ...ance state relying on a pullup resistor to make the signal line go high When using a single chassis leave W42 and W43 in position 1 the factory default on the SCXI 1120 that is connected to the data acquisition board In this setting the module drives MISO to SERDATOUT and connects the necessary pullup resistor to the SERDATOUT line When using multiple chassis leave jumper W43 in position 1 on all ...

Страница 23: ...actory default setting Position AB R0 connects the analog reference to the analog output ground pins 1 and 2 on the rear signal connector Select this configuration when using an RSE data acquisition board You should not use differential input data acquisition boards when jumper W46 is in the AB R0 position Position AB R1 connects the analog reference to the SCXIbus guard Position AB R2 enables the...

Страница 24: ...ed in a differential mode such as the MIO board you can access the temperature sensor only in the Multiplexed Output mode Direct temperature connection is not permissible to the data acquisition board This is the factory setting and is position 1 of the jumper block Position 3 is not explicitly marked If the temperature sensor needs to be accessed in parallel with the other eight outputs or scanne...

Страница 25: ...show how to set up the gain for each channel Table 2 4 Gain Jumper Allocation Input Channel Number First Gain Jumper Second Gain Jumper 0 W1 W9 1 W2 W10 2 W3 W11 3 W4 W12 4 W5 W13 5 W6 W14 6 W7 W15 7 W8 W16 The board is shipped with the first stage gain set to 100 position A and a second stage gain set to 10 position D To change the gain of your module move the appropriate jumper on your module to...

Страница 26: ...iminates the noise generated by the isolation amplifier producing a higher signal to noise ratio Furthermore two filter bandwidths are available 10 kHz and 4 Hz Table 2 6 Filter Jumper Allocation Input Channel First Filter Jumper Second Filter Jumper Number 4 Hz Factory Setting 10 kHz 4 Hz Factory Setting 10 kHz 0 W17 A W17 B W25 W26 1 W18 A W18 B W27 W28 2 W19 A W19 B W29 W30 3 W20 A W20 B W31 W3...

Страница 27: ... 1120 to the top and bottom threaded strips of your SCXI chassis 5 If this module is to be connected to an MIO 16 data acquisition board attach the connector at the metal end of the SCXI 1340 cable assembly to the rear signal connector on the SCXI 1120 module Screw the rear panel to the rear threaded strip Attach the loose end of the cable to the MIO 16 board Note For installation procedures with ...

Страница 28: ... pin assignments for the SCXI 1120 front connector 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 CHSGND 5 V CH3 CH7 CH6 CH5 CH4 CH2 CH1 CH7 CH6 CH5 DTEMP MTEMP CH4 CH3 CH2 CH1 CH0 CH0 RSVD RSVD RSVD Figure 2 3 SCXI 1120 Front Connector Pin Assignment ...

Страница 29: ...ls 7 through 0 respectively A30 A32 C12 C14 C18 CH7 through CH0 Negative Input Channels The negative inputs to C20 C24 C26 channels 7 through 0 respectively C30 C32 The signals on the front connector are all analog with the exceptions of pins A6 C6 and C8 The analog signals can be divided into two groups the analog input channels and the temperature sensor Analog Input Channels The positive input ...

Страница 30: ...ion I Vs Vcm High CMV Vout Module Figure 2 4 Ground Referenced Signal Connection with High Common Mode Voltage I Vs Vout Module Figure 2 5 Floating Signal Connection Referenced to Chassis Ground for Better Signal to Noise Ratio I Vs Vout Rbias Module Figure 2 6 Floating AC Coupled Signal Connection ...

Страница 31: ...ng equation Vofsbias Ibias x Rbias The input signal range of an SCXI 1120 input channel is 5 V Gtotal referenced to its negative input where Gtotal is equal to the product of the first stage and second stage gains In addition the input channels are overvoltage protected to 240 Vrms with power on or off at a maximum of 4 5 mArms sink or source Warning Exceeding the input signal range and the common...

Страница 32: ...e 1 Refer to Figure 2 8 Assembling and Mounting the SCXI 1330 Connector and Shell Assembly and the diagram included with your SCXI 1330 kit to build the connector and shell assembly 2 Turn off the computer that contains your data acquisition 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 cove...

Страница 33: ...h an onboard temperature sensor and screw terminals for easy connection One 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 SCXI 1320 terminal block and SCXI 1328 high accuracy isothermal terminal block consist of a shielded board with supports fo...

Страница 34: ...ted along the module type row for the SCXI 1120 as indicated in Figure 2 10 Terminal Block Temperature Sensor To accommodate thermocouples with the SCXI 1120 the terminal block has a temperature sensor for cold junction compensation You can connect the 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...

Страница 35: ... temperature sensor to the SCXI 1120 output multiplexer This is the factory setting The DTEMP position connects the temperature sensor to SCXI 1120 jumper W41 In both MTS and DTS modes the reference to the temperature sensor signal is the SCXI 1120 analog ground that is connected to MCHO in the MTS mode or to OUTREF or AOGND with SCXI 1120 jumper W46 set in positions AB R2 and AB R0 respectively i...

Страница 36: ...om inadequate safety earth ground connections Shock Hazard This unit should only be opened by qualified personnel aware of the dangers involved Disconnect all power before removing cover Always install grounding screw To connect 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 ...

Страница 37: ...Chapter 2 Configuration and Installation National Instruments Corporation 2 21 SCXI 1120 User Manual Figure 2 9 SCXI 1320 Parts Locator Diagram ...

Страница 38: ...Configuration and Installation Chapter 2 SCXI 1120 User Manual 2 22 National Instruments Corporation Figure 2 10 SCXI 1328 Parts Locator Diagram ...

Страница 39: ... 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 Rear Signal Connector Note If you will be using the SCXI 1120 with a National Instruments data acquisition board and cable assembly you do not need to read the remainder of this chapter If you will also be using the SCXI 1180 feedthrough panel the SCXI 1343 rear scre...

Страница 40: ...15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 AOGND MCH0 MCH1 OUTREF SERDATIN DAQD A SLOT0SEL DIG GND SERCLK RSVD AOGND MCH0 MCH1 DIG GND SERDATOUT SCANCLK MCH2 MCH3 MCH4 MCH2 MCH3 MCH4 MCH5 MCH6 MCH7 MCH5 MCH6 MCH7 Figure 2 11 SCXI 1120 Rear Signal Connector Pin Assignment ...

Страница 41: ...digital ground 25 SERDATIN Serial Data In Taps into the SCXIbus MOSI line to provide serial input data to a module or Slot 0 26 SERDATOUT Serial Data Out Taps into the SCXIbus MISO line to accept serial output data from a module 27 DAQD A Data Acquisition Board Data Address Line Taps into the SCXIbus D A line to indicate to the module whether the incoming serial stream is data or address informati...

Страница 42: ...W41 is in position 3 Notice that the temperature sensor is located on the terminal block For further details on configuring the temperature sensor output refer to the SCXI 1320 and SCXI 1328 Terminal Blocks section earlier in this chapter Warning The SCXI 1120 analog outputs are not overvoltage protected Applying external voltage to these outputs can result in damage to the SCXI 1120 National Inst...

Страница 43: ...C PC LPM 16 MOSI SERDATIN ADIO0 PB4 DOUT4 D A DAQD A ADIO1 PB5 DOUT5 INTR SLOT0SEL ADIO2 PB6 DOUT6 SPICLK SERCLK EXTSTROBE PB7 DOUT7 MISO SERDATOUT BDIO0 PC1 DIN6 The digital timing signals are pins 36 and 43 Pin 36 is used as a clock by the SCXI 1120 to increment the MUXCOUNTER after each conversion by the data acquisition board during scanning This signal is referred to as SCANCLK See Chapter 3 ...

Страница 44: ...and SERCLK Furthermore SS is produced by Slot 0 according to data acquisition board programming and SS timing relationships will also be discussed For information on the Slot 0 Slot Select Register consult Chapter 4 Register Descriptions The 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 det...

Страница 45: ...0 This will deassert all SS lines to all modules in all chassis 3 For each bit starting with the MSB perform the following action a SERDATIN bit to be sent These bits are the data that are being written to the Slot Select Register b SERCLK 0 c SERCLK 1 This 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...

Страница 46: ...lot 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 data will be written to Configuration Register SLOT0SEL 1 SERCLK 1 and has not transitioned since SS went low 2 For each bit to be writ...

Страница 47: ... to be read SERCLK 0 SERCLK 1 Clock the data Read the level of the SERDATOUT line 3 Pull SLOT0SEL low to deassert the SS line and establish conditions for writing a new slot select number to the Slot 0 Slot Select Register 4 If you are not selecting another slot you should write zero to the Slot 0 Slot Select Register Figure 2 16 illustrates a read of the SCXI 1120 Module ID Register SLOT0SEL SS S...

Страница 48: ...l unit making up the SCXI 1120 Functional Overview The block diagram in Figure 3 1 illustrates the key functional components of the SCXI 1120 SCXIbus Digital Interface and Control Timing and Analog Output Stage Rear Signal Connector Isolated Section Nonisolated Section Input Channel 0 Input Channel 1 Input Channel 6 Input Channel 7 Temperature Sensor Front Connector Figure 3 1 SCXI 1120 Block Diag...

Страница 49: ...ircuitry The SCXI 1120 consists of eight isolated amplifier channels with gains of 1 2 5 10 20 50 100 200 500 1 000 and 2 000 The SCXI 1120 also has a digital section for automatic control of channel scanning temperature selection and MUXCOUNTER clock selection The theory of operation of each of these components is explained in the rest of this chapter SCXIbus Connector Figure 3 2 shows the pinout...

Страница 50: ...B6 A7 B7 A8 B8 A9 B9 A10 B10 A11 B11 A12 B12 A13 B13 A14 B14 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 CHSGN...

Страница 51: ...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 ...

Страница 52: ... must tap into the open collector backplane signal lines as a master to write to the module The signal connections from the rear signal connector to the backplane are shown in Table 3 1 Table 3 1 SCXIbus Equivalents for the Rear Signal Connector Rear Signal Connector Signal SCXIbus Equivalent SERDATIN MOSI DAQD A D A SLOT0SEL INTR Jumper W44 must be set to position 1 Revision A and B modules only ...

Страница 53: ...ignal Connector MISO SPICLK INTR D A MOSI SS Figure 3 3 Digital Interface Circuitry Block Diagram The digital interface circuitry is divided into a data acquisition section and an SCXIbus section The SCXI 1120 connects to the SCXIbus via a 4x24 metral receptacle and to the data acquisition board via a 50 pin ribbon cable header The digital interface circuitry buffers the digital signals from the d...

Страница 54: ... is enabled and D A indicates data transfer D A low The Configuration Register provides channel selection and configures the SCXI 1120 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 W...

Страница 55: ...ex 00000004 Analog and Timing Circuitry The SCXIbus provides analog power 18 5 VDC that is regulated on the SCXI 1120 to 15 VDC a guard an analog bus AB0 and a chassis ground CHSGND AB0 buses the SCXI 1120 output to other modules or receives outputs from other modules via the SCXIbus The guard guards the analog bus and can be connected via jumper W46 to the analog ground reference or can be left f...

Страница 56: ...nput Channel 1 LPF I LPF To Output Stage Input Channel 2 LPF I LPF To Output Stage Input Channel 3 LPF I LPF To Output Stage Input Channel 4 LPF I LPF To Output Stage Input Channel 5 LPF I LPF To Output Stage Input Channel 6 LPF I LPF To Output Stage Input Channel 7 LPF I LPF To Output Stage Front Connector Figure 3 5 Analog Input Block Diagram ...

Страница 57: ...nacceptable you should spread the gains over both stages thus increasing the BW of each amplifier stage This will introduce in most cases a negligible effect on the channel bandwidth For example to achieve a gain of 100 use G1st 10 and G2nd 10 for a gain of 1 000 use G1st 50 and G2nd 20 All the amplifier input channels are overvoltage protected to 240 Vrms with power on or off The isolated amplifi...

Страница 58: ...the DMM display This is the DMM inherent offset and it should be subtracted from subsequent measurements 4 Short the desired channel inputs together and then to chassis ground 5 Set the amplifier gain to 1 6 Connect the amplifier output to the DMM Make sure that the DMM can achieve the accuracy and resolution you need 7 Adjust the output potentiometer of the desired channel until the output is 0 3...

Страница 59: ... 2 R12 R26 3 R14 R27 4 R16 R28 5 R18 R29 6 R20 R30 7 R21 R31 Analog Output Circuitry Figure 3 6 shows the SCXI 1120 analog output circuitry AB0 Switch Buffer MCH0 Output Mux Channel 0 Channel 7 MCH0 MCH1 From Channel 1 From Channel 6 MCH1 DTEMP MCH6 MCH6 W41 MCH7 MTEMP Analog Reference SCXIbus Rear Signal Connector Output Stage Control Output Stage and Hardware Scan Control From Channel 7 MCH7 Fig...

Страница 60: ...stallation The multiplexer output connects to the MCH0 and is connected to the data acquisition board analog channel input In the case of the MIO data acquisition boards MCH0 on the rear signal connector corresponds to ACH0 and ACH8 Furthermore the multiplexed output of the SCXI 1120 can be bused via switches to AB0 on the SCXIbus to other modules When you use multiple modules it is possible to bu...

Страница 61: ...xed Scanning Only the MIO 16 data acquisition boards support multiplexed scanning on the SCXI 1120 During multiplexed scanning a module sends the SCANCLK signal to Slot 0 over the TRIG0 backplane line and Slot 0 sends SCANCON signals to each module Each module uses its SCANCON signal to reload MUXCOUNTER and to determine when the SCXI 1120 output is enabled Slot 0 contains a module scan list first...

Страница 62: ...le Module Multiplexed Scanning Indirect In this mode the SCXI 1120 is not directly cabled to the data acquisition board Instead you connect another module to the data acquisition board and the analog output of the SCXI 1120 is sent over Analog Bus 0 through the intermediate module and then to the data acquisition board The SCXI 1120 receives its MUXCOUNTER clock from TRIG0 which is sent by the int...

Страница 63: ...ed channel of the data acquisition board Within each chassis scanning operations act as if the other chassis are not being used with one exception you must program the Slot 0 scan list in each chassis with dummy entries 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 tha...

Страница 64: ...of 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 uniqu...

Страница 65: ...tes will appear least significant byte first Within each byte data is sent out MSB 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 1120 is deselected by the SS signal on the backplane Type Read only Word Size 4 byte Bit Map Byte 0 7 6 5 4 3 2 1 0 0 0 0 0 0 1 0 0 Byte 1 7 6 5 4 3 2 ...

Страница 66: ...Scan Clock Output Enable This bit determines whether the SCANCLK signal from the rear signal connector is sent out in inverted form to the TRIG0 backplane signal 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 Scan Clock Select This bit determines whether the SCXI 1120 uses SCANCLK or the inverted form of TRIG0 to...

Страница 67: ...XCOUNTER will not be clocked 2 SCANCONEN Scan Control Enable This bit when set to 1 enables the SCANCON signal 1 AB0EN Analog Bus 0 Enable This bit determines whether Analog Bus 0 on the SCXIbus drives MCH0 on the rear signal connector If AB0EN is cleared to 0 Analog Bus 0 doesnot drive MCH0 If AB0EN is set to 1 Analog Bus 0 drives MCH0 through a buffer and a Analog Bus 0 is connected to MCH0 0 FO...

Страница 68: ...ister 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 You should maintain software copies of the Slot Select Register HSCRs and all the Slot 0 scan lists that correspond to the writes to FIFO Registers If you are using multiple chassis it is important to understand the architectural differences o...

Страница 69: ...he chassis number written The Slot Select Register will shift in the data present on the MOSI line bit 16 first when SLOT0SEL is low Type Write only Word Size 16 bit Bit Map 15 14 13 12 11 10 9 8 X X X X X X X CHS4 7 6 5 4 3 2 1 0 CHS3 CHS2 CHS1 CHS0 SL3 SL2 SL1 SL0 Bit Name Description 15 9 X Don t care bits Unused 8 4 CHS 4 0 Chassis Bit 4 through 0 These bits determine which chassis is selected...

Страница 70: ...st 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 shut down at the end of the scan list circuitry during a data acquisi...

Страница 71: ...er 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 15 14 13 12 11 10 9 8 X X X X X MOD3 MOD2 MOD1 7 6 5 4 3 2 1 0 MOD0 CNT6 CNT5 CNT4 CNT3 CNT2 CNT1 CNT0 Bit Name Descripti...

Страница 72: ...ting channel for scanned measurements The 16 bit patterns are presented MSB first left to right Register Writes This section describes how to write to the Configuration Register HSCR and FIFO Register including the procedure for writing to the Slot Select Register to select the appropriate slot For timing specifics refer to the Timing Requirements and Communication Protocol section in Chapter 2 Co...

Страница 73: ...sing an MIO 16 board writing to the EXTSTROBE register will pulse EXTSTROBE low and then high accomplishing steps 3b and 3c 4 Set SLOT0SEL to 1 This will assert the SS line of the module whose slot number was written to Slot 0 If you are using multiple chassis only the appropriate slot in the chassis whose address corresponds to the written chassis number will be selected automatically When no com...

Страница 74: ...odule is disconnected from Analog Bus 0 and disabled from scanning Single Channel Measurements This section describes how to program the SCXI 1120 either alone or in conjunction with other modules to make single channel or nonscanned measurements Direct Measurements Parallel Output To perform a parallel output measurement you must cable the SCXI 1120 rear signal connector to a data acquisition boa...

Страница 75: ...olve 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 1120 rear signal connector to a data acquisition board See Chapter 2 Configuration and Installation for more information To make a measurement from another module per...

Страница 76: ... 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 pattern 00XXXXXX XX100010 to the SCXI 1120 Configuration Register 4 Measure the voltage with the data acquisition board Scanning Measurements Programming for scanned data acquisition involves programming your data acquisition board modules and Slot 0 In ge...

Страница 77: ...us AT MIO 16F 5 User Manual Posttrigger Data Acquisition with Continuous Channel Scanning Posttrigger Data Acquisition with Interval Channel Scanning AT MIO 16X User Manual Continuous Channel Scanning Data Acquisition Interval Channel Scanning Data Acquisition AT MIO 64F 5 User Manual Continuous Channel Scanning Data Acquisition Interval Channel Scanning Data Acquisition Lab LC User Manual Program...

Страница 78: ...nterval channel scanning in the AT MIO 16X and AT MIO 64F 5 user manuals Do not continue to the part labeled Enable a Scanning Data Acquisition Operation or Enable an Interval Scanning Data Acquisition Operation You will do this after you have programmed the modules and Slot 0 Note For multiplexed scanning with an MIO board it is important that you follow the instructions in the channel scanning s...

Страница 79: ... Data Acquisition Operation section in the appropriate data acquisition board user manual 1 Write FF01 to the Am9513 Command Register to select Counter 1 Mode Register 2 Write 0325 hex to the Am9513 Data Register to store Counter 1 Mode Value for most MIO boards For the AT MIO 16F 5 and the AT MIO 16X and the AT MIO 64F 5 write 1325 hex 3 Write FF09 to the Am9513 Command Register to select Counter...

Страница 80: ...to the SCXI 1120 Configuration Register This step disables the SCXI 1120 from driving Analog Bus 0 and allows Analog Bus 0 to drive MCH0 through the output buffer 3 Program the other module to be scanned Channel Scanning from the SCXI 1120 via Another Module To scan the SCXI 1120 via other modules you must cable the other module to a data acquisition board and the other module must be able to tran...

Страница 81: ...assis you must use the SCXI 1001 chassis The cable from the data acquisition board must bus the digital lines to one module on each chassis Additionally the cable must provide each chassis with its own analog channel The data acquisition board must be able to take several readings at a time on a given channel before accessing a new channel See the Counter 1 and SCANDIV subsection of the 1 Data Acq...

Страница 82: ...o the HSCR In the preceding steps S 0 if you want the scanning to repeat when the end of the list is reached S 1 if you want the circuitry to 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 t...

Страница 83: ...ition operation 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 in Chapter 4 Register Descriptions Example 1 You want to scan...

Страница 84: ... the SCXI 1120 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 10XXX000 00001111 to the Configuration Register of the SCXI 1120 in Slot 4 4 Following the procedure given in the Register Writes section write ...

Страница 85: ...should be as follows Chassis 1 Chassis 2 Chassis 3 Entry Slot Number Count Entry Slot Number Count Entry Slot Number Count 1 4 5 1 13 5 1 13 12 2 13 11 2 11 7 2 3 3 3 13 4 3 8 1 Other solutions are possible In the section earlier in this chapter 3 Programming the Slot 0 Hardscan Circuitry step 3 Write the Slot 0 scan list to the FIFO consists of the following steps 1 Select Slot 14 in Chassis 1 2 ...

Страница 86: ...rogramming National Instruments Corporation 5 15 SCXI 1120 User Manual 13 Toggle SLOT0SEL 14 Write XXXXX001 00000010 over MOSI 15 Toggle SLOT0SEL 16 Write XXXXX011 10000000 over MOSI 17 Select Slot 0 in Chassis 0 ...

Страница 87: ...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 40 MΩ Power off 50 kΩ Overload 50 kΩ Output resistance Multiplexed Output mode 100 Ω Parallel Output mode 330 Ω Filtering jumper selectable 4 Hz 10 dB or 10 kHz 3 dB 3 pole RC Output selection time with 5 V step all gains 0 012 accura...

Страница 88: ...n continuous 250 Vrms maximum Output protection Continuous short to ground Power dissipation 7 5 W maximum Cold Junction Sensor3 SCXI 1320 Accuracy 1 0 from 0 to 55 C Output 10 mV C SCXI 1328 Accuracy4 0 35 from 15 to 35 C 0 65 from 0 to 15 and 35 to 55 C Output 1 91 to 0 58 V from 0 to 55 C 1Includes the combined effects of the SCXI 1120 and the AT MIO 16F 5 2Includes the combined effects of the ...

Страница 89: ...tance of the thermistor in Ω RT 50 000 VTEMPOUT 2 5 VTEMPOUT VTEMPOUT output voltage of the temperature sensor Physical Dimensions 1 2 by 6 8 by 8 0 in Connectors 50 pin male ribbon cable rear connector 32 pin DIN C male front connector 18 screw terminal adapter available Operating Environment Temperature 0 to 50 C Relative humidity 5 to 90 at 35 C Storage Environment Temperature 55 to 150 C 55 to...

Страница 90: ...re B 1 shows the pin assignments for the SCXI 1120 rear signal connector 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 AOGND MCH0 MCH1 OUTREF SERDATIN DAQD A SLOT0SEL DIG GND SERCLK RSVD AOGND MCH0 MCH1 DIG GND SERDATOUT SCANCLK MCH2 MCH3 MCH4 MCH2 MCH3 MCH4 MCH5 MCH6 MCH7 MCH5 MCH6 MCH7 Figure B 1 SCXI ...

Страница 91: ...uisition board digital signals and are tied to the module digital ground 25 SERDATIN Serial Data In Taps into the SCXIbus MOSI line to provide serial input data to a module or Slot 0 26 SERDATOUT Serial Data Out Taps into the SCXIbus MISO line to accept serial output data from a module 27 DAQD A Data Acquisition Board Data Address Line Taps into the SCXIbus D A line to indicate to the module wheth...

Страница 92: ...ents Corporation B 3 SCXI 1120 User Manual See the Timing Requirements and Communication Protocol section in Chapter 2 Configuration and Installation for more detailed information on timing Detailed signal specifications are also included in Chapter 2 ...

Страница 93: ...120 User Manual Appendix C SCXIbus Connector This appendix describes the pinout and signal names for the SCXI 1120 96 pin SCXIbus connector including a description of each connection Figure C 1 shows the pinout of the SCXI 1120 SCXIbus connector ...

Страница 94: ...B6 A7 B7 A8 B8 A9 B9 A10 B10 A11 B11 A12 B12 A13 B13 A14 B14 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 CHSGN...

Страница 95: ...w 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 R...

Страница 96: ...0 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 All other pins are not connected Further information is given in Chapter 3 Theory of Operation ...

Страница 97: ... a description of each connection Figure D 1 shows the pin assignments for the SCXI 1120 front connector 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 CHSGND 5 V CH3 CH7 CH6 CH5 CH4 CH2 CH1 CH7 CH6 CH5 DTEMP MTEMP CH4 CH3 CH2 CH1 CH0 CH0 RSVD RSVD RSVD Figure D 1 SCXI 1120 Front Connector Pin Assignment ...

Страница 98: ... terminal block 0 2 mA of source not protected C4 MTEMP Multiplexed Temperature Sensor Connects the temperature sensor to the output multiplexer A6 C6 C8 RSVD Reserved Reserved for future use Do not connect any signals to these pins TTL CMOS output They are not protected A8 A10 C10 No Connect Do not connect any signals to these pins A16 C16 A22 C22 A28 C28 A12 A14 A18 CH7 through CH0 Positive Inpu...

Страница 99: ...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 mounting bracket on the ribbon cable All 50 pins from the MIO 16 board go straight through to the rear signal connector You can use a standard 50 pin ribbon cable instead of the SCXI 1340 cable assembly The SCXI...

Страница 100: ...ACH14 17 MCH7 ACH7 18 MCH7 ACH15 19 OUTREF AISENSE 24 33 DIG GND DIG GND 25 SERDATIN ADIO0 26 SERDATOUT BDIO0 27 DAQD A ADIO1 29 SLOT0SEL ADIO2 36 SCANCLK SCANCLK 37 SERCLK EXTSTROBE 43 RSVD OUT1 No other pins are connected on the SCXI 1120 SCXI 1340 Installation Follow these steps to install the SCXI 1340 1 Make sure that the computer and the SCXI chassis are turned off 2 Install the SCXI module ...

Страница 101: ... E 1 SCXI 1340 Installation SCXI 1341 Lab NB Lab PC or Lab PC and SCXI 1344 Lab LC Cable Assembly The SCXI 1341 Lab NB Lab PC or Lab PC cable assembly connects a Lab NB Lab PC or Lab PC board to an SCXI 1120 module The SCXI 1344 Lab LC cable assembly connects a Lab LC board to an SCXI 1120 module The SCXI 1341 and SCXI 1344 cable assemblies consist of two pieces an adapter board and a 50 conductor...

Страница 102: ...UT 20 No Connect 11 AOGND 23 No Connect 12 DAC1OUT 21 No Connect 13 50 DGND 24 33 DIG GND 26 PB4 25 SERDATIN 27 PB5 27 DAQD A 28 PB6 29 SLOT0SEL 29 PB7 37 SERCLK 31 PC1 26 SERDATOUT 32 PC2 28 No Connect 40 EXTCONV 36 SCANCLK 43 OUTB1 46 No Connect 49 5 V 34 35 No Connect All other pins of the Lab board pinout are not sent to the SCXI 1120 rear signal connector SCXI 1341 and SCXI 1344 Installation ...

Страница 103: ...120 rear signal connector pinout The adapter board also has an additional male breakout connector that makes the unmodified PC LPM 16 signals accessible to an SCXI 1180 feedthrough panel or SCXI 1181 breadboard module The adapter board gives the PC LPM 16 full access to the digital control lines and analog signals but the PC LPM 16 cannot scan channels in the Multiplexed mode Leave jumper W1 in po...

Страница 104: ... to the PC LPM 16 I O connector Check the installation SCXI 1180 Feedthrough Panel The 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 m...

Страница 105: ...the chassis Attach the rear connector to the breakout connector of the adjacent cable assembly or slot extender as shown in Figure E 2 Step 3 SCXI 1180 Breakout Connector Ribbon Cable to Front Panel Rear Connector Breakout Connector from SCXI 1340 Threaded Strip in Rear of Chassis Step 4 Rear Panel Figure E 2 SCXI 1180 Rear Connections 4 Screw in the rear panel to the threaded strip in the rear of...

Страница 106: ...ire the SCXI 1302 terminal block you must remove the cover connect 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...

Страница 107: ...el 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 SCXI 1302 securely in place Check the installation SCXI 1351 One Slot Cable Extender The SCXI 1351 cable extender is a miniature SCXI 1340 cable assembly Instead of connecting to an MIO board 1 m away...

Страница 108: ...h chassis to chassis connection and a ribbon cable for the connection from the MIO board to the first chassis Note Use 0 5 m ribbon cable when connecting multiple chassis together to minimize cable length and maintain signal integrity You can use a 1 m cable from the MIO board to the first chassis The adapter board has a male rear connector a female front connector and a male chassis extender conn...

Страница 109: ... until all chassis are connected For N chassis you will need N ribbon cables and N multichassis adapters SCXI 1343 Rear Screw Terminal Adapter You use the SCXI 1343 universal adapter to adapt custom wiring to the SCXI 1120 The SCXI 1343 has screw terminals for the analog output connections and solder pads for the rest of the signals A strain relief clamp is on the outside of the rear panel SCXI 13...

Страница 110: ...nal 18 MCH7 Screw terminal 19 OUTREF Screw terminal 20 No Connect Solder pad 21 No Connect Solder pad 22 No Connect Solder pad 23 No Connect Solder pad 24 33 DIG GND Solder pad 26 SERDATOUT Solder pad 27 DAQD 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...

Страница 111: ...ins a photograph of the Revision A and B SCXI 1120 signal conditioning module and the general and detailed parts locator diagrams Figure F 1 shows the Revision A and B SCXI 1120 signal conditioning module Figures F 2 and F 3 show the general and detailed parts locator diagrams Figure F 1 Revision A and B SCXI 1120 Signal Conditioning Module ...

Страница 112: ...Revision A and B Photo and Parts Locator Diagrams Appendix F SCXI 1120 User Manual F 2 National Instruments Corporation Figure F 2 Revision A and B SCXI 1120 General Parts Locator Diagram ...

Страница 113: ...Appendix F Revision A and B Photo and Parts Locator Diagrams National Instruments Corporation F 3 SCXI 1120 User Manual Figure F 3 Revision A and B SCXI 1120 Detailed Parts Locator Diagram ...

Страница 114: ...ble Monday through Friday from 8 00 a m to 6 00 p m central time In other countries contact the nearest branch office You may fax questions to us at any time Corporate Headquarters 512 795 8248 Technical support fax 800 328 2203 512 794 5678 Branch Offices Phone Number Fax Number Australia 03 879 9422 03 879 9179 Austria 0662 435986 0662 437010 19 Belgium 02 757 00 20 02 757 03 11 Denmark 45 76 26...

Страница 115: ...ficiently If you are using any National Instruments hardware or software products related to this problem include the configuration forms from their user manuals Include additional pages if necessary Name Company Address Fax Phone Computer brand Model Processor Operating system Speed MHz RAM MB Display adapter Mouse yes no Other adapters installed Hard disk capacity MB Brand Instruments used Natio...

Страница 116: ... Shielding and Reference Mode Selection Factory Setting Parked W46 B R0R1 Input Channel Gain Configuration Input Channel First Stage Gain Second Stage Gain Total Gain Factory Setting User Setting Factory Setting User Setting Factory Setting 1 000 0 100 W1 A 10 W9 D 1 100 W2 A 10 W10 D 2 100 W3 A 10 W11 D 3 100 W4 A 10 W12 D 4 100 W5 A 10 W13 D 5 100 W6 A 10 W14 D 6 100 W7 A 10 W15 D 7 100 W8 A 10 ...

Страница 117: ...Part Number 320425B 01 Please comment on the completeness clarity and organization of the manual If you find errors in the manual please record the page numbers and describe the errors Thank you for your help Name Title Company Address Phone Mail to Technical Publications Fax to Technical Publications National Instruments Corporation National Instruments Corporation 6504 Bridge Point Parkway MS 53...

Страница 118: ...al AB0EN Analog Bus 0 Enable bit ACH data acquisition board Analog Input Channel Number A D analog to digital AOGND Analog Output Ground signal Arms amperes root mean square AWG American Wire Gauge B BW bandwidth C C Celsius CH Positive Input Channel Number signal CH Negative Input Channel Number signal CHAN Channel Select bit CHS Chassis bit CHSGND Chassis Ground signal CJR cold junction referenc...

Страница 119: ... DMM digital multimeter DTEMP Direct Temperature Sensor signal DTS direct temperature sensor 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 HSRS Hardscan Reset bit Hz hertz I II input current leakage in inches INTR Interrupt signal I O input output K K...

Страница 120: ...ultiplexed temperature sensor N NRSE nonreferenced single 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 RTSI Real Time System Integration S SCANCLK Scan Clock sig...

Страница 121: ...l Peripheral Interface SPICLK Serial Peripheral Interface Clock signal SS Slot Select signal T tempco temperature coefficient TRIG0 Trigger 0 signal U UL Underwriters Laboratory V V volts V Positive Analog Supply signal V Negative Analog Supply signal VDC volts direct current VIH input logic high voltage VIL input logic low voltage VOH output logic high voltage VOL output logic low voltage Vrms vo...

Страница 122: ...ting AC coupled signal connection 2 14 floating signal connection 2 14 ground referenced signal connection 2 14 warning against exceeding input range 2 15 theory of operation 3 8 to 3 10 analog input specifications A 1 to A 2 analog output circuitry 3 12 to 3 13 analog output signal connections 2 26 AOGND signal analog output signal connections 2 26 rear signal connector 2 25 B 2 B bit description...

Страница 123: ...r SPI bus 2 28 to 2 31 Configuration Register write timing diagram 2 31 Module ID Register timing diagram 2 31 serial data timing diagram 2 30 slot select procedure 2 28 to 2 29 slot select timing diagram 2 29 writing to Configuration Register 2 30 configuration See also signal connections analog configuration direct temperature connection jumper W41 2 8 to 2 9 filter jumpers 2 10 gain jumpers 2 9...

Страница 124: ...input channels 2 13 to 2 15 AC coupled signal connection 2 15 floating AC coupled signal connection 2 14 floating signal connection 2 14 ground referenced signal connection 2 14 pin assignments 2 12 D 1 SCXI 1320 terminal block connecting 2 17 to 2 18 installation 2 23 jumper configuration 2 19 parts locator diagram 2 21 signal connection 2 20 temperature sensor 2 18 SCXI 1328 terminal block conne...

Страница 125: ...software 1 2 to 1 3 LOAD bit 4 7 M manual See documentation MCH0 through MCH7 signal analog output signal connections 2 26 3 13 rear signal connector 2 25 B 2 MISO signal description of 3 4 C 3 digital control circuitry 3 8 jumper connection 2 4 2 5 2 6 and SPI bus 3 5 MOD 3 0 bit 4 8 module configuration See configuration Module ID Register description of 4 2 theory of operation 3 8 timing diagra...

Страница 126: ...procedure 5 2 to 5 3 scanning examples 5 12 to 5 15 scanning measurements 5 5 to 5 12 acquisition enable triggering and servicing 5 12 data acquisition and board programming 5 6 to 5 8 Counter 1 and SCANDIV 5 8 module programming 5 8 to 5 10 channel scanning from other modules 5 9 channel scanning from SCXI 1120 via another module 5 9 multiple chassis scanning 5 10 multiple module multiplexed scan...

Страница 127: ...4 to 3 15 SCXIbus connector 3 5 C 4 SCANCONEN bit 4 4 4 7 scanning measurements module programming 5 8 to 5 10 channel scanning from other modules 5 9 channel scanning from SCXI 1120 via another module 5 9 multiple chassis scanning 5 10 multiple module multiplexed scanning 5 9 to 5 10 single module multiplexed scanning direct 5 9 single module multiplexed scanning indirect 5 9 single module parall...

Страница 128: ...y E 3 to E 4 installation E 4 to E 5 pin equivalences E 4 SCXI 1350 multichassis adapter cable assembly E 10 installation E 10 to E 11 SCXI 1351 one slot cable extender cable assembly E 9 installation E 10 SCXIbus connector pin assignments 3 3 C 2 pin equivalences with rear signal connector 3 5 with rear signal connector and data acquisition boards 2 27 5 2 signal descriptions 3 4 to 3 5 C 3 to C ...

Страница 129: ... 0 bit 4 6 Slot 0 hardscan circuitry programming 5 10 to 5 11 Slot 0 registers 4 5 to 4 8 FIFO Register 4 8 Hardscan Control Register HSCR 4 7 Slot Select Register 4 6 slot selection register selection and write procedure 5 2 to 5 3 slot select timing diagram 2 29 writing 16 bit slot select number 2 29 SLOT0SEL signal communicating on SPI bus 2 28 to 2 31 digital I O signal connections 2 26 to 2 2...

Страница 130: ...circuitry 3 7 to 3 8 digital interface circuitry 3 6 scanning modes 3 13 to 3 16 multiple chassis scanning 3 16 multiple module multiplexed scanning 3 15 to 3 16 single module multiplexed scanning 3 14 to 3 15 single module parallel scanning 3 14 SCXIbus connector equivalents for rear signal connector 3 5 pin assignments 3 3 signal descriptions 3 4 to 3 5 timing signal SCANCLK 2 28 TRIG0 signal 3 ...

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