National Instruments SCXI-1102, SCXI-1102C, SCXI-1102B User Manual

TM

SCXI

SCXI-1102/B/C User Manual

SCXI-1102/B/C User Manual

April 2006
371975D-01

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Warranty

The SCXI-1102, SCXI-1102B, and SCXI-1102C modules are warranted against defects in materials and workmanship for a period of one year
from the date of shipment, as evidenced by receipts or other documentation. National Instruments will, at its option, repair or replace equipment
that proves to be defective during the warranty period. This warranty includes parts and labor.

The media on which you receive National Instruments software are warranted not to fail to execute programming instructions, due to defects in
materials and workmanship, for a period of 90 days from date of shipment, as evidenced by receipts or other documentation. National Instruments
will, at its option, repair or replace software media that do not execute programming instruc tions if National Instruments receives notice of such defects
during the warranty period. National Instruments does not warrant that the operation of the software shall be uninterrupted or error free.

A Return Material Authorization (RMA) number must be obtained from the factory and clearly marked on the outside of the package before any
equipment will be accepted for warranty work. National Instruments will pay the shipping costs of returning to the owner parts which are covered by
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Conventions

The following conventions are used 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 Setup»Options directs you to
pull down the File menu, select the Page Setup item, and select Options
from the last dialog box.

This icon denotes a note, which alerts you to important information.

This icon denotes a caution, which advises you of precautions to take to
avoid injury, data loss, or a system crash. When this icon is marked on the
product, refer to the Read Me First: Safety and Radio-Frequency
Interference document, shipped with the product, for precautions to take.

When symbol is marked on a product it denotes a warning advising you to
take precautions to avoid electrical shock.

When symbol is marked on a product it denotes a component that may be
hot. Touching this component may result in bodily injury.

bold Bold text denotes items that you must select or click in the software, such

as menu items and dialog box options. Bold text also denotes parameter
names.

italic Italic text denotes variables, emphasis, a cross-reference, or an introduction

to a key concept. Italic text also denotes text that is a placeholder for a word
or value that you must supply.

monospace Text in this font denotes text or characters that you should enter from the

keyboard, sections of code, programming examples, and syntax examples.
This font is also used for the proper names of disk drives, paths, directories,
programs, subprograms, subroutines, device names, functions, operations,
variables, filenames, and extensions.

monospace bold Bold text in this font denotes the messages and responses that the computer

automatically prints to the screen. This font also emphasizes lines of code
that are different from the other examples.

Contents

Chapter 1
About the SCXI-1102/B/C

What You Need to Get Started ......................................................................................1-2

National Instruments Documentation ............................................................................1-3

Installing Application Software, NI-DAQ, and the DAQ Device .................................1-4

Installing the SCXI-1102/B/C Module into the SCXI Chassis .......................1-4

Connecting the SCXI-1102/B/C in an SCXI Chassis

to an E/M Series DAQ Device for Multiplexed Scanning ...........................1-5

Connecting the SCXI-1102/B/C in a PXI/SCXI Combination Chassis

to an E/M Series DAQ Device for Multiplexed Scanning ...........................1-5

Verifying the SCXI-1102/B/C Installation in Software ................................................1-5

Installing SCXI Using NI-DAQmx in Software .............................................1-5

Manually Adding Modules in NI-DAQmx .....................................................1-5

Installing SCXI Using Traditional NI-DAQ (Legacy) in Software ................1-5

Manually Adding Modules in Traditional NI-DAQ (Legacy) ........................1-6

Verifying and Self-Testing the Installation .....................................................1-6

Troubleshooting the Self-Test Verification ...................................................................1-6

Troubleshooting in NI-DAQmx ......................................................................1-6

Troubleshooting in Traditional NI-DAQ (Legacy) .........................................1-8

Chapter 2
Connecting the Signals

Front Connector .............................................................................................................2-1

Front Connector Signal Descriptions ..............................................................2-3

Analog Input Signal Connections .....................................................2-3

Cold-Junction Sensor Connection ...................................................................2-6

Rear Signal Connector ...................................................................................................2-6

Rear Signal Connector Descriptions ...............................................................2-8

Connecting Thermocouples ..............................................................2-9

Connecting RTDs..............................................................................2-9

Connecting a Current-Loop Receiver ...............................................2-9

Chapter 3
Configuring and Testing

SCXI-1102/B/C Software-Configurable Settings ..........................................................3-1

Common Software-Configurable Settings ......................................................3-1

Gain/Input Range ..............................................................................3-1

CJC Source/Value .............................................................................3-1

© National Instruments Corporation vii SCXI-1102/B/C User Manual

Contents

Configurable Settings in MAX...................................................................................... 3-2

NI-DAQmx ..................................................................................................... 3-2

Traditional NI-DAQ (Legacy) ........................................................................ 3-4

Verifying the Signal ...................................................................................................... 3-5

Verifying the Signal in NI-DAQmx Using a Task or Global Channel........... 3-6

Verifying the Signal in Traditional NI-DAQ (Legacy) .................................. 3-6

Chapter 4
Theory of Operation

Rear Signal Connector, SCXIbus Connector, and SCXIbus Interface.......................... 4-2

Digital Control Circuitry ............................................................................................... 4-2

Analog Circuitry............................................................................................................ 4-2

Analog Input Channels.................................................................................... 4-2

Theory of Multiplexed Operation.................................................................................. 4-3

Creating a Global Channel or Task .................................................. 3-3

Configuring Module Property Pages in

Traditional NI-DAQ (Legacy).......................................................3-4

Creating a Virtual Channel ...............................................................3-5

Verifying the Signal Using Virtual Channel .................................... 3-6

Verifying the Signal Using Channel Strings .................................... 3-7

Chapter 5
Using the SCXI-1102/B/C

Developing Your Application in NI-DAQmx............................................................... 5-1

Typical Program Flowchart ............................................................................ 5-1

General Discussion of Typical Flowchart....................................................... 5-3

Creating a Task Using DAQ Assistant or Programmatically ........... 5-3

Adjusting Timing and Triggering..................................................... 5-3

Configuring Channel Properties ....................................................... 5-4

Acquiring, Analyzing, and Presenting.............................................. 5-7

Completing the Application.............................................................. 5-7

Developing an Application Using LabVIEW ................................................. 5-7

Using a NI-DAQmx Channel Property Node in LabVIEW ............. 5-9

Specifying Channel Strings in NI-DAQmx ....................................................5-10

Text Based ADEs ............................................................................. 5-11

Programmable NI-DAQmx Properties ............................................. 5-13

Developing Your Application in Traditional NI-DAQ (Legacy).................................. 5-13

Other Application Documentation and Material ........................................................... 5-14

Using Software for Multiplexed Scanning...................................................... 5-15

LabVIEW and the SCXI Channel String.......................................... 5-15

LabVIEW and the Virtual Channel String ....................................... 5-15

SCXI-1102/B/C User Manual viii ni.com

Contents

Performing a Multiplexed Scan.......................................................................5-16

C and Low-Level DAQ Functions .................................................... 5-16

Traditional NI-DAQ (Legacy) CVI Examples ................................................5-17

Traditional NI-DAQ (Legacy) Measurement Studio Examples......................5-17

Calibration .....................................................................................................................5-18

Appendix A
Specifications

Appendix B
Using SCXI Channel Strings with Traditional NI-DAQ (Legacy) 7.0 or
Later

Appendix C
Removing the SCXI-1102/B/C

Appendix D
Common Questions

Appendix E
Current-Loop Receivers

Glossary

Index

© National Instruments Corporation ix SCXI-1102/B/C User Manual

Contents

Figures

Tables

Figure 2-1. Ground-Referenced Signal Connection ................................................2-5

Figure 2-2. Floating Signal Connection Referenced to Chassis Ground ................. 2-6

Figure 4-1. SCXI-1102/B/C Module Block Diagram.............................................. 4-1

Figure 5-1. Typical Program Flowchart for Voltage Measurement Channels ........ 5-2

Figure 5-2. Typical SCXI-1102/B/C Program Flow

with Traditional NI-DAQ (Legacy) ...................................................... 5-14

Figure A-1. SCXI-1102/B/C Dimensions ................................................................ A-4

Figure C-1. Removing the SCXI-1102/B/C ............................................................. C-2

Figure E-1. Bent and Trimmed Resistor .................................................................. E-2

Table 2-1. SCXI-1102/B/C Front Signal Pin Assignments ................................... 2-2

Table 2-2. Front Connector Signals ....................................................................... 2-3

Table 2-3. Rear Signal Pin Assignments................................................................ 2-7

Table 2-4. SCXI-1102/B/C Communication Signals ............................................ 2-8

Table 5-1. NI-DAQmx Voltage Measurement Properties ..................................... 5-4

Table 5-2. NI-DAQmx Thermocouple Measurement Properties .......................... 5-5

Table 5-3. NI-DAQmx RTD Measurement Properties ......................................... 5-5

Table 5-4. NI-DAQmx Thermistor Measurement Properties ............................... 5-6

Table 5-5. NI-DAQmx Current Measurement Properties ..................................... 5-6

Table 5-6. Programming a Task in LabVIEW ...................................................... 5-8

Table 5-7. NI-DAQ Functions Used to Configure SCXI-1102/B/C ...................... 5-17

Table D-1. Digital Signals on the SCXI-1102/B/C ................................................ D-2

SCXI-1102/B/C User Manual x ni.com

About the SCXI-1102/B/C

This chapter introduces the SCXI-1102/B/C module, and explains how to

install and remove the software and hardware.

The SCXI-1102/B/C modules are for signal conditioning of

thermocouples, low-bandwidth volt and millivolt sources, 4 to 20 mA

current sources, and 0 to 20 mA process-current sources. When used with

the SCXI-1581 precision current source module, you can use the

SCXI-1102/B/C to measure RTDs and thermistors. The SCXI-1102/B/C

has 32 differential analog input channels and one cold-junction sensor

channel. Each channel also has an amplifier with a selectable gain of 1 or

100. You can multiplex the SCXI-1102/B/C inputs to a single output, which

drives a single DAQ device channel.

On each channel the modules have the following:

• SCXI-1102—a two-pole lowpass filter with a 2 Hz cutoff frequency to
reject 60 Hz noise.

• SCXI-1102B—a three-pole lowpass filter with a 200 Hz cutoff
frequency.

• SCXI-1102C—a three-pole lowpass filter with a 10 kHz cutoff
frequency.

1

You can multiplex several SCXI-1102/B/C modules and other SCXI
modules into a single channel on the DAQ device, greatly increasing the
number of analog input signals that you can digitize.

Detailed specifications of the SCXI-1102/B/C modules are listed in
Appendix A, Specifications.

© National Instruments Corporation 1-1 SCXI-1102/B/C User Manual

Chapter 1 About the SCXI-1102/B/C

What You Need to Get Started

To set up and use the SCXI-1102/B/C module, you need the following:

❑ Hardware

– At least one of the following modules:

• SCXI-1102

• SCXI-1102B

• SCXI-1102C

– At least one of the following terminal blocks:

• SCXI-1300

• SCXI-1303

• SCXI-1308

• SCXI-1310

• TC-2095

• TBX-1303

•TBX-96

– An SCXI chassis or PXI/SCXI combination chassis

– One of the following:

• E/M Series DAQ device

• SCXI-1600

– A computer if using an SCXI chassis

– Cabling, cable adapter, and sensors as required for your

application

❑ Software

–NI-DAQ

– One of the following software packages:

•LabVIEW

• Measurement Studio

™

• LabWindows

SCXI-1102/B/C User Manual 1-2 ni.com

/CVI

™

❑ Documentation

– Read Me First: Safety and Radio-Frequency Interference

– DAQ Getting Started Guide

– SCXI Quick Start Guide

– SCXI-1102/B/C User Manual

– Terminal block installation guide for your application

– Documentation for your software

National Instruments Documentation

The SCXI-1102/B/C User Manual is one piece of the documentation set for
data acquisition (DAQ) systems. You could have any of several types of
manuals depending on the hardware and software in the system. Use the
manuals you have as follows:

• SCXI chassis or PXI/SCXI combination chassis manual—Read this
manual for maintenance information on the chassis and for installation
instructions.

• The DAQ Getting Started Guide—This document has information on
installing NI-DAQ and the E/M Series DAQ device. Install these
before you install the SCXI module.

• The SCXI Quick Start Guide—This document contains a quick
overview for setting up an SCXI chassis, installing SCXI modules and
terminal blocks, and attaching sensors. It also describes setting up the
SCXI system in MAX.

• The SCXI hardware user manuals—Read these manuals next
for detailed information about signal connections and module
configuration. They also explain, in greater detail, how the module
works and contain application hints.

• Accessory installation guides or manuals—Read the terminal block
and cable assembly installation guides. They explain how to physically
connect the relevant pieces of the system. Consult these guides when
you are making the connections.

• The E/M Series DAQ device documentation—This documentation has
detailed information about the E/M Series DAQ device that plugs into
or is connected to the computer. Use this documentation for hardware
installation and configuration instructions, specification information
about the E/M Series DAQ device, and application hints.

Chapter 1 About the SCXI-1102/B/C

© National Instruments Corporation 1-3 SCXI-1102/B/C User Manual

Chapter 1 About the SCXI-1102/B/C

• Software documentation—You may have both application software

• One or more of the following help files for software information:

and NI-DAQ software documentation. National Instruments (NI)
application software includes LabVIEW, LabWindows/CVI, and
Measurement Studio. After you set up the hardware system, use either
your application software documentation or the NI-DAQ
documentation to help you write your application. If you have a large,
complex system, it is worthwhile to look through the software
documentation before you configure the hardware.

– Start»Programs»National Instruments»NI-DAQ»

NI-DAQmx Help

– Start»Programs»National Instruments»NI-DAQ»

Traditional NI-DAQ User Manual

– Start»Programs»National Instruments»NI-DAQ»

Traditional NI-DAQ Function Reference Help

You can download NI documents from
the latest version of NI-DAQ, click Download Software at

ni.com/manuals. To download

ni.com.

Installing Application Software, NI-DAQ, and the DAQ Device

Refer to the DAQ Getting Started Guide packaged with the NI-DAQ
software to install your application software, NI-DAQ driver software, and
the E/M Series DAQ device to which you will connect the SCXI-1102/B/C.
NI-DAQ 7.0 or later is required to configure and program the
SCXI-1102/B/C module. If you do not have NI-DAQ 7.0 or later, you can
either contact a NI sales representative to request it on a CD or download
the latest NI-DAQ version from

Note Refer to the Read Me First: Safety and Radio-Frequency Interference document

before removing equipment covers or connecting or disconnecting any signal wires.

Installing the SCXI-1102/B/C Module into the SCXI Chassis

Refer to the SCXI Quick Start Guide to install the SCXI-1102/B/C module.

ni.com.

SCXI-1102/B/C User Manual 1-4 ni.com

Chapter 1 About the SCXI-1102/B/C

Connecting the SCXI-1102/B/C in an SCXI Chassis to an E/M Series DAQ Device for Multiplexed Scanning

Refer to the SCXI Quick Start Guide to install the cable adapter and connect
the SCXI modules to the E/M Series DAQ device.

If you have already installed the appropriate software, refer to Chapter 3,

Configuring and Testing, to configure the SCXI-1102/B/C module(s).

Connecting the SCXI-1102/B/C in a PXI/SCXI Combination Chassis to an E/M Series DAQ Device for Multiplexed Scanning

Refer to the SCXI Quick Start Guide to connect the SCXI modules to the
E/M Series DAQ device.

If you have already installed the appropriate software, refer to Chapter 3,

Configuring and Testing, to configure the SCXI-1102/B/C module(s).

Verifying the SCXI-1102/B/C Installation in Software

Refer to the SCXI Quick Start Guide for information on verifying the SCXI
installation.

Installing SCXI Using NI-DAQmx in Software

Refer to the SCXI Quick Start Guide for information on installing modules
using NI-DAQmx in software.

Manually Adding Modules in NI-DAQmx

If you did not auto-detect the SCXI modules, you must manually add each
of the modules. Refer to the SCXI Quick Start Guide to manually add
modules.

Note NI recommends auto-detecting modules for the first time configuration of the

chassis.

Installing SCXI Using Traditional NI-DAQ (Legacy) in Software

Refer to the SCXI Quick Start Guide for information on installing modules
using Traditional NI-DAQ (Legacy) in software.

© National Instruments Corporation 1-5 SCXI-1102/B/C User Manual

Chapter 1 About the SCXI-1102/B/C

Manually Adding Modules in Traditional NI-DAQ (Legacy)

If you did not auto-detect the SCXI modules, you must manually add each
of the modules. Refer to the SCXI Quick Start Guide to manually add
modules.

Note NI recommends auto-detecting modules for the first time configuration of the

chassis.

Verifying and Self-Testing the Installation

The verification procedure for the SCXI chassis is the same for both
NI-DAQmx and Traditional NI-DAQ (Legacy). To test the successful
installation for the SCXI chassis, refer to the SCXI Quick Start Guide.
Verify that the chassis is powered on and correctly connected to an
E/M Series DAQ device.

After verifying and self-testing the installation, the SCXI system should
operate properly with your ADE software. If the test did not complete
successfully, refer to Chapter 3, Configuring and Testing, for
troubleshooting steps.

Troubleshooting the Self-Test Verification

If the self-test verification did not verify the chassis configuration,
complete the steps in this section to troubleshoot the SCXI configuration.

Troubleshooting in NI-DAQmx

• If you get a Verify SCXI Chassis message box showing the SCXI
chassis model number, Chassis ID: x, and one or more messages
stating Slot Number: x Configuration has module: SCXI-XXXX
or 1102/B/C, hardware in chassis is: Empty, take the following
troubleshooting actions:

– Make sure the SCXI chassis is powered on.

– Make sure all SCXI modules are properly installed in the chassis.

Refer to the SCXI Quick Start Guide for proper installation
instructions.

– Make sure the cable between the SCXI chassis and E/M Series

DAQ device is properly connected.

– Inspect the cable connectors for bent pins.

SCXI-1102/B/C User Manual 1-6 ni.com

Chapter 1 About the SCXI-1102/B/C

– Make sure you are using the correct NI cable assembly.

– Test the E/M Series DAQ device to verify it is working properly.

Refer to the E/M Series DAQ device help file for more
information.

• If you get a Verify SCXI Chassis message box showing the SCXI
chassis model number, Chassis ID: x, and the message Slot

Number: x Configuration has module: SCXI-XXXX or 1102/B/C,
hardware in chassis is: SCXI-YYYY, 1102/B/C, or Empty, complete

the following troubleshooting steps to correct the error.

1. Expand the list of NI-DAQmx devices by clicking the + next to

NI-DAQmx Devices.

2. Right-click the SCXI chassis and click Properties to load the

chassis configurator.

3. Under the Modules tab, ensure that the cabled module is listed in

the correct slot.

4. If the cabled module is not listed in the correct slot, complete the

following troubleshooting steps:

a. If the cabled module is not listed in the correct slot and the

slot is empty, click the drop-down listbox next to the correct
slot and select the cabled module. Configure the cabled
module following the steps listed in the SCXI Quick Start
Guide. Click OK.

b. If another module appears where the cabled module should

be, click the drop-down listbox next to the correct slot and
select the cabled module. A message box appears asking you
to confirm the module replacement. Click OK. Configure the
cabled module following the steps listed in the SCXI Quick
Start Guide. Click OK.

• If you have more than one kind of SCXI module in the SCXI chassis,
ensure that you have the highest priority SCXI module cabled to the
E/M Series DAQ device. Refer to the SCXI Quick Start Guide to find
out which SCXI module in the chassis should be cabled to the
E/M Series DAQ device.

• After checking the preceding items, return to the Troubleshooting the

Self-Test Verification section and retest the SCXI chassis.

If these measures do not successfully configure the SCXI system, contact
NI. Refer to the Technical Support Information document for contact
information.

© National Instruments Corporation 1-7 SCXI-1102/B/C User Manual

Chapter 1 About the SCXI-1102/B/C

Troubleshooting in Traditional NI-DAQ (Legacy)

• If you get the message Unable to test chassis at this time,
you have not designated at least one module as connected to a E Series
DAQ device. Refer to the Traditional NI-DAQ (Legacy) section of
Chapter 3, Configuring and Testing,
the cabled module in the system from Connected to: None to
Connected to: Device x.

• If you get the message
codes and the message
take the following troubleshooting actions:

– Make sure the SCXI chassis is powered on.

– Make sure the cable between the SCXI chassis and E Series DAQ

device is properly connected.

– Inspect the cable connectors for bent pins.

– Make sure you are using the correct NI cable assembly.

– Test the E Series DAQ device to verify it is working properly.

Refer to the E Series DAQ device help file for more information.

• If you get the message
and the message
to the Traditional NI-DAQ (Legacy) section of Chapter 3, Configuring

and Testing, and make sure the correct module is in the specified slot.

Delete the incorrect module as described in Appendix C, Removing the

SCXI-1102/B/C, and add the correct module as described in the
Traditional NI-DAQ (Legacy) section of Chapter 3, Configuring and
Testing.

• If you get the message
and the message
is installed in the specified slot. If not, install the module by following
the instructions in the SCXI Quick Start Guide. If the module is
installed in the correct slot, power off the chassis, remove the module
as specified in Appendix C, Removing the SCXI-1102/B/C, and verify
that no connector pins are bent on the rear signal connector. Reinstall
the module as described in the SCXI Quick Start Guide, ensuring
the module is fully inserted and properly aligned in the slot.

• After checking the preceding items, return to the Troubleshooting the

Self-Test Verification section and retest the SCXI chassis.

Failed to find followed by the module
Unable to communicate with chassis,

Failed to find, followed by module codes

Instead found: module with ID 0Xxx, refer

Failed to find, followed by a module code

Slot x is empty, make sure the configured module

and change the configuration of

If these measures do not successfully configure the SCXI system, contact
NI. Refer to the Technical Support Information document for contact
information.

SCXI-1102/B/C User Manual 1-8 ni.com

Connecting the Signals

This chapter describes the input and output signal connections to the
SCXI-1102/B/C module with the module front connector and rear signal
connector. This chapter also includes connection instructions for the
signals on the SCXI-1102/B/C module connectors.

Refer to the installation guide of the terminal block for detailed information
regarding connecting the signals. If you are using a custom cable or
connector block, refer to the Front Connector section.

Front Connector

Table 2-1 shows the pin assignments for the SCXI-1102/B/C module front
connector.

2

© National Instruments Corporation 2-1 SCXI-1102/B/C User Manual

Chapter 2 Connecting the Signals

Table 2-1. SCXI-1102/B/C Front Signal Pin Assignments

Front Connector Diagram Pin Number Column A Column B Column C

32 CH GND AI 0 – AI 0 +

Column

ABC

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

NC—No Connection

31 NC AI 1 – AI 1 +

30 NC AI 2 – AI 2 +

29 NC AI 3 – AI 3 +

28 NC AI 4 – AI 4 +

27 NC AI 5 – AI 5 +

26 NC AI 6 – AI 6 +

25 NC AI 7 – AI 7 +

24 CH GND AI 8 – AI 8 +

23 NC AI 9 – AI 9 +

22 NC AI 10 – AI 10 +

21 NC AI 11 – AI 11 +

20 NC AI 12– AI 12 +

19 NC AI 13 – AI 13 +

18 NC AI 14 – AI 14 +

17 NC AI 15 – AI 15 +

16 CH GND AI 16 – AI 16 +

15 NC AI 17 – AI 17 +

14 NC AI 18 – AI 18 +

13 NC AI 19 – AI 19 +

12 NC AI 20 – AI 20 +

11 NC AI 21 – AI 21 +

10 NC AI 22 – AI 22 +

9 NC AI 23 – AI 23 +

8 NC AI 24 – AI 24 +

7 NC AI 25 – AI 25 +

6 NC AI 26 – AI 26 +

5 CH GND AI 27 – AI 27 +

4 CJ SENSOR AI 28 – AI 28 +

3 CJ SENSOR AI 29 – AI 29 +

2 CH GND AI 30 – AI 30 +

1 +5 V AI 31 – AI 31 +

SCXI-1102/B/C User Manual 2-2 ni.com

Chapter 2 Connecting the Signals

Front Connector Signal Descriptions

Table 2-2. Front Connector Signals

Pin Signal Name Description

A1 +5 V +5 VDC Source—Used to power the

temperature sensor on the terminal block.

0.2 mA of source not protected.

A2, A5, A16, A24,
A32

A3, A4 CJ SENSOR Cold-junction Temperature Sensor

B1–B32 AI 31 – through AI 0 – Negative Input Channels—Negative side of

C1–C32 AI 31 + through AI 0 + Positive Input Channels 31 through

Note: All other pins are not connected.

CH GND Chassis Ground—Tied to the SCXI chassis.

Input—Connects to the temperature sensor
of the terminal block.

differential input channels.

0—Positive side of differential input
channels.

Analog Input Signal Connections

The signal terminals for the negative input channel are located in column B
of the connector. The signal terminal for each corresponding positive input
channel is located in column C of the connector. Each input goes to a
separate filter and amplifier that is multiplexed to the module output buffer.
If the terminal block has a temperature sensor, the sensor output—
connected to pins A3 and A4 (CJ SENSOR)—is also filtered and
multiplexed to the module output buffer.

The differential input signal range of an SCXI-1102/B/C module input
channel is ±10 V when using a gain of 1 or ±0.1 V when using a gain of

100. This differential input range is the maximum measurable voltage
difference between the positive and negative channel inputs. The
common-mode input signal range of an SCXI-1102/B/C module input
channel is ±10 V. This common-mode input range for either positive or
negative channel input is the maximum input voltage that results in a valid
measurement. Each channel includes input protection circuitry to withstand
the accidental application of voltages up to ±42 VAC peak or 60 VDC.

© National Instruments Corporation 2-3 SCXI-1102/B/C User Manual

Chapter 2 Connecting the Signals

Cautions Exceeding the input damage level (±42 VAC peak or 60 VDC between input

channels and chassis ground) can damage the SCXI-1102/B/C module, the SCXIbus, and
the DAQ device. NI is not liable for any injuries resulting from such signal connections.

Applying a voltage greater than ±42 VAC peak or 60 VDC to the SCXI-1102/B/C is an
electrical shock hazard. NI is not liable for any damages or injuries resulting from such
voltage application.

Note Exceeding the differential or common-mode input channel ranges results in a

distorted signal measurement, and can also increase the settling time requirement of the
connected E/M Series DAQ device.

Ground-Referencing the Signals

The input signals can be either ground-referenced, as shown in Figure 2-1,
or floating, as shown in Figure 2-2. Before you connect the thermocouple
or any other signal, determine whether it is floating or ground-referenced.
If it is a floating signal, you must ground-reference the signal in one of two
ways. You can connect the negative channel input to chassis ground
through a bias resistor as shown in Figure 2-2 or you can use the bias
resistors that are included with some terminal blocks such as the
SCXI-1303. The SCXI-1303 also has a resistor pack for pulling up the
positive inputs for open-thermocouple detection. Consult the installation
guide of your terminal block for details.

Do not ground signals that are already ground-referenced; doing so results
in a ground loop, which adversely affects the measurement accuracy.
Directly grounding floating signals to the chassis ground without using a
bias resistor is not recommended as this can result in noisy readings.

SCXI-1102/B/C User Manual 2-4 ni.com

Chapter 2 Connecting the Signals

CH 0+

CH 0–

+

–

+

V

s

–

CH 1+

CH 1–

Connector

Front Signal

CH 31+

CH 31–

+

–

+

–

SCXI - 1102/B/C

Figure 2-1. Ground-Referenced Signal Connection

© National Instruments Corporation 2-5 SCXI-1102/B/C User Manual

Chapter 2 Connecting the Signals

CH 0+

CH 0–

Floating

Signal

Make This

Connection

to Ground
Reference
the Signal

+

V

s

–

Referenced to

Chassis Ground

CH 1+

CH 1–

R

bias

Connector

Front Signal

CH 31+

CH 31–

CH GND

Figure 2-2. Floating Signal Connection Referenced to Chassis Ground

Cold-Junction Sensor Connection

Pins A3 and A4 (CJ SENSOR) connect the temperature sensor located on
the SCXI-1300 or SCXI-1303 terminal blocks to the SCXI-1102/B/C
module. The CJ SENSOR signal is measured relative to CH GND. Pins A3
and A4 are connected within the SCXI-1102/B/C module so the position of
the MTEMP/DTEMP jumper on the SCXI-1300 or SCXI-1303 does not
matter. The input is overvoltage-protected to 15 VDC with power on
and off.

+

–

+

–

+

–

SCXI - 1102/B/C

Caution Exceeding the overvoltage protection on the CJ SENSOR input can damage the

SCXI-1102/B/C module, the SCXIbus, and the DAQ device. NI is not liable for any
damages or injuries resulting from such signal connections.

Rear Signal Connector

Table 2-3 shows the SCXI-1102/B/C module rear signal connector pin
assignments.

SCXI-1102/B/C User Manual 2-6 ni.com

Rear Connector

Diagram

2

1

4

3

6

5

8

7

10

9

12

11

14

13

16

15

18

17

20

19

22

21

24

23

26

25

28

27

30

29

32

31

34

33

36

35

38

37

40

39

42

41

44

43

46

45

48

47

50

49

Chapter 2 Connecting the Signals

Table 2-3. Rear Signal Pin Assignments

Signal Name Pin Number Pin Number Signal Name

AI GND 1 2 AI GND

CH 0 + 3 4 CH 0 –

NC 5 6 NC

NC 7 8 NC

NC 9 10 NC

NC 11 12 NC

NC 13 14 NC

NC 15 16 NC

NC 17 18 NC

OUT REF 19 20 NC

NC 21 22 NC

NC 23 24 D GND

SER DAT IN 25 26 SER DAT OUT

DAQ D*/A 27 28 NC

SLOT 0 SEL* 29 30 NC

D GND 31 32 NC

NC 33 34 NC

NC 35 36 AI HOLD COMP, AI HOLD

SER CLK 37 38 NC

NC 39 40 NC

NC 41 42 NC

RSVD 43 44 NC

NC—No

Connection

© National Instruments Corporation 2-7 SCXI-1102/B/C User Manual

NC 45 46 RSVD

NC 47 48 NC

NC 49 50 NC

Chapter 2 Connecting the Signals

Rear Signal Connector Descriptions

The rear signal connector on the cabled module is the interface between
the DAQ device and all modules in the SCXI chassis. CH 0 is used to
differentially multiplex all 32 channels, the CJ sensor, and analog signals
from the modules to the connected DAQ device.

The communication signals between the DAQ device and the SCXI
system are listed in Table 2-4. If the DAQ device is connected to the
SCXI-1102/B/C, these digital lines are unavailable for general-purpose
digital I/O.

Table 2-4. SCXI-1102/B/C Communication Signals

NI-DAQmx

SCXI

Pin

24, 33 DIG GND D GND DGND — Digital ground—these

25 SER DAT IN P0.0 DIO0 Input Serial data in—this

26 SER DAT OUT P0.4 DIO4 Output Serial data out—this

27 DAQ D*/A P0.1 DIO1 Input Board data/address

Signal Name

Device Signal

Name

Traditional NI-DAQ

(Legacy) Device

Signal Name

Direction Description

pins supply the
reference for
E/M Series DAQ device
digital signals and are
connected to the
module digital ground.

signal taps into the
SCXIbus MOSI line to
send serial input data to
a module or Slot 0.

signal taps into the
SCXIbus MISO line to
accept serial output data
from a module.

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.

SCXI-1102/B/C User Manual 2-8 ni.com

Chapter 2 Connecting the Signals

Table 2-4. SCXI-1102/B/C Communication Signals (Continued)

NI-DAQmx

SCXI

Pin

29 SLOT0SEL* P0.2 DIO2 Input Slot 0 select—this

36 SCANCLK AI HOLD COMP,

37 SER CLK EXTSTROBE* EXTSTROBE* Input Serial clock—this

43, 46 RSVD RSVD RSVD Input Reserved.

Note: All other pins are not connected.

Signal Name

Device Signal

Name

AI HOLD

Traditional NI-DAQ

(Legacy) Device

Signal Name

SCANCLK Input Scan clock—a rising

Direction Description

signal taps into the
SCXIbus INTR* line to
indicate whether the
information on MOSI is
being sent to a module
or Slot 0.

edge indicates to the
scanned SCXI module
that the E/M Series
DAQ device has taken a
sample and causes the
module to advance
channels.

signal taps into the
SCXIbus SPICLK line
to clock the data on the
MOSI and MISO lines.

Connecting Thermocouples

Refer to the terminal block installation guide, such as the SCXI-1303, for
information about connecting thermocouples. NI recommends using an
isothermal terminal block, such as the SCXI-1303, for accurate
thermocouple measurements.

Connecting RTDs

Refer to the SCXI-1581 User Manual for information about connecting
RTDs and for additional RTD theory.

Connecting a Current-Loop Receiver

Refer to Appendix E, Current-Loop Receivers, for information about
connecting current loop receivers.

© National Instruments Corporation 2-9 SCXI-1102/B/C User Manual

Configuring and Testing

This chapter discusses configuring the SCXI-1102/B/C in MAX for use
with either NI-DAQmx or Traditional NI-DAQ (Legacy), creating and
testing a virtual channel, global channel, and/or task.

SCXI-1102/B/C Software-Configurable Settings

This section describes how to set the gain/input signal range and how to
configure your software for compatible sensor types. It also describes how
to perform configuration of these settings for the SCXI-1102/B/C in
NI-DAQmx and Traditional NI-DAQ (Legacy). For more information on
the relationship between the settings and the measurements and how to
configure settings in your application, refer to Chapter 4, Theory of

Operation.

Common Software-Configurable Settings

This section describes the most frequently used software-configurable
settings for the SCXI-1102/B/C. Refer to Chapter 4, Theory of Operation,
for a complete list of software-configurable settings.

3

Gain/Input Range

Gain/input range is a software-configurable setting that allows you to
choose the appropriate amplification to fully utilize the range of the
E/M Series DAQ device. In most applications NI-DAQ chooses and sets
the gain for you determined by the input range. This feature is described in
Chapter 4, Theory of Operation. Otherwise, you should determine the
appropriate gain using the input signal voltage range and the full-scale
limits of the SCXI-1102/B/C output. You can select a gain of 1 or 100 on a
per channel basis.

CJC Source/Value

When using a terminal block that has a CJ sensor for thermocouple
measurements, you can set the CJC source as internal, which scans the
sensor at the beginning of each measurement and scales the readings
accordingly.

© National Instruments Corporation 3-1 SCXI-1102/B/C User Manual