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Introduction

Chapter 1

SCXI-1124 User Manual

1-4

© National Instruments Corporation

Always consider using NI-DAQ, LabVIEW, or LabWindows to program your National
Instruments data acquisition hardware.  Using the NI-DAQ, LabVIEW, or LabWindows software
is easier than, and as flexible as register-level programming, and can save you weeks of
development time.

Complete instructions for programming your module or DAQ board with NI-DAQ, LabVIEW,
or LabWindows are in the corresponding software manuals.  If you are using NI-DAQ,
LabVIEW, or LabWindows to control your board, you should not need the register-level
programmer manual.  The SCXI-1124 Register-Level Programmer Manual contains low-level
programming details, such as register maps, bit descriptions, and register programming hints,
that you will need only for register-level programming.  If you want to obtain the register-level
programmer manual, please fill out the Register-Level Programmer Manual Request Form at the
end of this manual and send it to National Instruments.

Optional Equipment

Equipment

Part Number

SCXI-1325 front terminal block

776573-25

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

776575-44

SCXI-1345 SCXI shielded cable assembly

with 1 m cable
with 2 m cable
with 5 m cable
with 10 m cable

776574-451
776574-452
776574-455
776574-450

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
776574-470

SCXI-1348 DIO-32F cable assembly

776574-48

SCXI-1350 multichassis adapter

776575-50

SCXI-1351 one-slot cable extender

776575-51

Standard ribbon cable

0.5 m
1.0 m

180524-05
180524-10

NB5 cable

0.5 m
1.0 m

181304-05
181304-10

NB6 cable

0.5 m
1.0 m

181305-05
181305-10

Refer to Chapter 3, Signal Connections, the accessory installation guides, and the National
Instruments Catalog for additional information on cabling, connectors, and adapters.

Содержание SCXI -1124

Страница 1: ...SCXI 1124 TM Copyright 1994 1999 National Instruments Corporation All Rights Reserved User Manual Six Channel Isolated Digital to Analog Converter Module September 1999 Edition Part Number 320712B 01...

Страница 2: ...905 785 0085 Canada Qu bec 514 694 8521 China 0755 3904939 Denmark 45 76 26 00 Finland 09 725 725 11 France 01 48 14 24 24 Greece 30 1 42 96 427 Germany 089 741 31 30 Hong Kong 2645 3186 India 918052...

Страница 3: ...AUSED BY FAULT OR NEGLIGENCE ON THE PART OF NATIONAL INSTRUMENTS SHALL BE LIMITED TO THE AMOUNT THERETOFORE PAID BY THE CUSTOMER NATIONAL INSTRUMENTS WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM LOSS...

Страница 4: ...ART OF THE USER OR APPLICATIONS DESIGNER ADVERSE FACTORS SUCH AS THESE ARE HEREAFTER COLLECTIVELY TERMED SYSTEM FAILURES ANY APPLICATION WHERE A SYSTEM FAILURE WOULD CREATE A RISK OF HARM TO PROPERTY...

Страница 5: ...4 Custom Cables 1 5 Unpacking 1 5 Chapter 2 Configuration and Installation 2 1 Module Configuration 2 1 Supplementary Jumper Configuration Information 2 3 Hardware Installation 2 3 Chapter 3 Signal Co...

Страница 6: ...ront Connector Pin Assignments 3 3 Figure 3 2 DAC Channel Connection as Voltage Output 3 5 Figure 3 3 DAC Channel Connection as Current Output Internal Loop Supply 3 5 Figure 3 4 DAC Channel Connectio...

Страница 7: ...allation of the SCXI 1124 into the SCXI chassis and cable wiring Chapter 3 Signal Connections describes the signal connections to the SCXI 1124 module via the SCXI 1124 front connector and via the rea...

Страница 8: ...al Instruments AT MIO 16 AT MIO 16D AT MIO 16F 5 AT MIO 16X AT MIO 64F 5 MC MIO 16 NB MIO 16 and NB MIO 16X multichannel I O data acquisition boards unless otherwise noted MIO type board MIO type boar...

Страница 9: ...ware system use either the application software LabVIEW or LabWindows manuals or the NI DAQ manuals to help you write your application If you have a large and complicated system it is worthwhile to lo...

Страница 10: ...mments 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 To make it easy for you to contact us this man...

Страница 11: ...ntrol several SCXI 1124s in a single chassis with one data acquisition board and in combination with other SCXI module types The SCXI 1325 shielded terminal block has screw terminals for easy signal a...

Страница 12: ...cquisition libraries are functionally equivalent to the NI DAQ software Using LabVIEW or LabWindows software will greatly diminish the development time for your data acquisition and control applicatio...

Страница 13: ...dware with NI DAQ software for PC compatibles The National Instruments NB Series data acquisition boards are packaged with NI DAQ software for Macintosh NI DAQ software for Macintosh comes with langua...

Страница 14: ...rammer Manual Request Form at the end of this manual and send it to National Instruments Optional Equipment Equipment Part Number SCXI 1325 front terminal block 776573 25 SCXI 1340 cable assembly 7765...

Страница 15: ...ctor is a special 48 pin DIN C male connector The manufacturer part number for the connector National Instruments uses is as follows ERNI Components Inc part number 033 273 The mating connector for th...

Страница 16: ...allation This chapter describes the SCXI 1124 jumper configurations installation of the SCXI 1124 into the SCXI chassis and cable wiring Module Configuration The SCXI 1124 includes four jumpers that a...

Страница 17: ...nicate with all of the other modules in each chassis On the unconnected modules the jumper settings are irrelevant Tables 2 1 and 2 2 list the description and configuration of the jumper settings You...

Страница 18: ...W4 in the M position If you are using the SCXI 1124 and MIO type board as well as modules with analog inputs you should cable the MIO type board to one of the analog input modules The SCXI 1124 cannot...

Страница 19: ...ion and configuration instructions are in Chapter 1 Introduction to NI DAQ Find the installation and system configuration section for your operating system and follow the instructions given there If y...

Страница 20: ...ategory requires local level supply mains connected installation DO NOT OPERATE DAMAGED EQUIPMENT The safety protection features built into this device can become impaired if the module becomes damage...

Страница 21: ...e terminal block is not connected to the chassis To connect the safety earth when the terminal block is not connected to the chassis To connect the safety earth ground to the safety ground solder lug...

Страница 22: ...124 front connector Pin Number Signal Name Column A B C Signal Name 30 29 26 25 22 21 18 17 14 13 10 9 6 5 2 1 ISINK 0 SUPPLY 0 GND 0 VOUT 0 ISINK 1 SUPPLY 1 GND 1 VOUT 1 ISINK 2 SUPPLY 2 GND 2 VOUT 2...

Страница 23: ...oltage output and the loop supply C1 CHASSIS GND Chassis Ground This pin provides a ground reference for floating signals It is not a safety earth ground All other pins are not connected Analog Output...

Страница 24: ...D SCXI 1124 SCXI 1124 High CMV VOUT VOUT load load VCM Figure 3 2 DAC Channel Connection as Voltage Output Figure 3 3 shows how to connect a DAC channel as a current output using the channel loop supp...

Страница 25: ...ommon mode voltage ISINK c Load with high common mode voltage VEXT load I VCM High CMV SCXI 1124 VCM High CMV load VEXT I I ISINK I GND 0 20 mA 0 20 mA GND ISINK Figure 3 4 DAC Channel Connection as C...

Страница 26: ...h ground connect the isolated ground of the channel to the chassis ground pin Do not use this pin as a safety earth ground because the ground trace cannot handle the potentially large currents that re...

Страница 27: ...ATIN DAQD A SLOT0SEL MIO SERCLK DIGGND MIO SERDATOUT MIO DIO SERCLK DIO SERDATOUT DIGGND DIO Figure 3 6 SCXI 1124 Rear Signal Connector Pin Assignments Rear Signal Connector Signal Descriptions Pin Si...

Страница 28: ...es active low All other pins are not connected See the Timing Requirements and Communication Protocol section in the SCXI 1124 Register Level Programmer Manual for more detailed information on timing...

Страница 29: ...6 or 47 SERDATOUT is equivalent to SCXIbus MISO when jumper W2 is in position 1 Pins 26 and 47 are not tied together Pin 26 is for MIO type boards when SCXI 1124 jumpers W2 W3 and W4 are in the MIO po...

Страница 30: ...XTSTROBE BDIO0 PB4 PB5 PB6 PB7 PC1 DOUT4 DOUT5 DOUT6 DOUT7 DIN6 PB3 PB2 PB1 PB0 PA0 APB3 APB2 APB1 APB0 APA0 DIOB3 DIOB2 DIOB1 DIOB0 DIOA0 The following specifications and ratings apply to the digital...

Страница 31: ...ation Rear Signal Connector SCXIbus Connector SCXIbus Interface Circuitry Digital Interface and Control Calibration EEPROM Output Channel 0 Output Channel 5 Front Signal Connector Chassis Ground Buffe...

Страница 32: ...ontains a Module ID register write circuitry for updating the DACs and an EEPROM for storing calibration constants The Module ID register contains the module ID 14 hex a code unique to the SCXI 1124 Y...

Страница 33: ...llowing table shows typical ranges Table 4 1 Typical DAC Channel Ranges Nominal Range Typical Range 0 to 1 V 9 mV to 1 006 V 0 to 5 V 46 mV to 5 028 V 0 to 10 V 92 mV to 10 055 V 1 V 1 015 V to 1 015...

Страница 34: ...of a channel to earth ground If the isolated ground of the channel is at a large common mode voltage with respect to earth shorting the voltage output to earth ground damages the module The voltage ou...

Страница 35: ...p supply for sourcing current The current sink is an N channel power MOSFET sink to ground The current sink converts the voltage from the output of the unipolar or bipolar selection circuit In order f...

Страница 36: ...of 3 to 42 V If the voltage is too low the SCXI 1124 cannot sink the full 20 mA If the voltage is too high overheating can occur and the module can be damaged You can use the loop supply on each SCXI...

Страница 37: ...stics 1 5 or 10 V BL BH 4 095 Code Code Bipolar Voltage Output Characteristics 0 V 0 V 20 mA BL BH Code 4 095 0 mA Current Output Characteristics 1 5 or 10 V Figure 5 1 SCXI 1124 Output Characteristic...

Страница 38: ...s chapter describes how to determine the calibration constants Calibration Methods Two Point Calibration Method With this method you program a channel with two different DAC codes measure the circuit...

Страница 39: ...t Fit Actual Output LSB INL Boundary Not to Scale 1 2 Code 4 095 Figure 5 2 DAC Characteristics Second the INL of the DAC is specified on an endpoint fit The SCXI 1124 DACs have an INL of 0 5 LSB Ther...

Страница 40: ...curve has a bend see Figure 5 1 you must use two codes that are on the sloped portion of the curve You should use 4 095 as the upper code For the lower code using the code 255 is recommended for simp...

Страница 41: ...able to fit BL and BH onto the EEPROM In this case you will need to keep track of BL and BH elsewhere Measurement Technique When you measure voltage or current from the SCXI 1124 you should use a vol...

Страница 42: ...istics Relative accuracy INL 1 2 LSB Absolute accuracy Current output 0 1 of full scale range max Voltage outputs 0 05 of full scale max DNL 1 LSB guaranteed monotonic Monotonicity Guaranteed over tem...

Страница 43: ...temperature coefficient Unipolar range 1 ppm C typical 5 ppm C max Bipolar range 10 ppm C typical 20 ppm C max Gain temperature coefficient 25 ppm C typical 40 ppm C max Physical Dimensions 1 2 by 6 8...

Страница 44: ...central time In other countries contact the nearest branch office You may fax questions to us at any time Corporate Headquarters 512 795 8248 Branch Offices Phone Number Australia 03 9879 5166 Austria...

Страница 45: ...iciently 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 N...

Страница 46: ...urrent configuration Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your questions more efficiently SCXI 1124 Revi...

Страница 47: ...l programmer manual Check all that apply National Instruments does not support your operating system or programming language You are an experienced register level programmer who is more comfortable wr...

Страница 48: ...ptember 1999 Part Number 320694B 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 Th...

Страница 49: ...Analog Output Ground signal Arms amperes root mean square AWG American Wire Gauge C Celsius CHASSISGND Chassis Ground signal cm centimeters D A digital to analog D A Data Address signal DAC digital to...

Страница 50: ...significant bit ppm parts per million RAM random access memory RC resistor capacitor RESET Reset signal rms root mean square RTSI Real Time System Integration SCXI Signal Conditioning eXtensions for I...

Страница 51: ...rrect codes for current output 4 5 to 4 6 for voltage output circuitry 4 3 to 4 4 limitations 5 4 modification of constants 4 2 CHASSIS GND signal 3 4 chassis ground connections 3 7 configuration jump...

Страница 52: ...on 3 5 internal loop supply illustration 3 5 as voltage output illustration 3 5 pin assignments illustration 3 3 signal descriptions 3 5 G GND 0 5 signal 3 4 H hardware installation 2 3 to 2 4 hazardo...

Страница 53: ...3 to 1 4 unpacking 1 5 communication signals emulation by digital I O signal lines 3 9 to 3 10 SCXIbus to SCXI 1124 pin equivalences table 3 11 purpose 4 2 SERCLK signal 3 9 3 10 SERDATIN signal 3 9 S...

Страница 54: ...4 3 to 4 4 block diagram 4 1 digital control circuitry 4 2 functional overview 4 1 major components of SCXI 1124 4 2 rear signal connector 4 2 SCXIbus connector and interface 4 2 U unipolar mode 4 3 u...

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