National Instruments 321906B-01 - page 41

Appendix E Common Questions

NI 2501/2503 User Manual E-2

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National Instruments Corporation

• Finally, verify that your code is correct. For reference, see the

examples described in the NI-SWITCH Software User Manual. The

NI-SWITCH driver also ships with several examples in source code.

Compare your algorithm to the ones in the examples.

What should I do if scanning does not work?

• First, ensure that you have configured the switch card and the

instrument to match trigger lines. The output trigger of the instrument

should connect to the trigger input of the switch card. In addition, the

scanner advanced trigger of the switch card should be connected to the

input trigger of the instrument.

• If the switch card is used to initiate the scan, make sure the DMM is

waiting for a trigger before enabling scanning on the switch card. This

is the recommended method for hardware scanning.

• If the DMM is used to initiate the scan, enable scanning on the switch

card before configuring the DMM to start taking measurements.

• Also be sure to check the return codes of the NI-SWITCH operation to

ensure that there are no errors (negative value) or warnings (positive

value). You can also use the NI-Spy utility to check for error codes.

• Finally, verify that your code is correct. For reference, see the

examples described in the NI-SWITCH Software User Manual. The

NI-SWITCH driver also ships with several examples in source code.

Compare your algorithm to the ones in the examples.

Do I need to program the switch card myself?

The NI25 01/2503 comes with the NI-SWITCH driver software, which

exports the full functionality of the card. NI-SWITCH handles the complex

issues of direct memory access, interrupts, and operating system

interfacing.

Contents

Main Page Important Information Warranty Copyright Trademarks WARNING REGARDING MEDICAL AND CLINICAL USE OF NATIONAL INSTRUMENTS PRODUCTS Compliance FCC/DOC Radio Frequency Interference Class A Compliance Federal Communications Commission Canadian Department of Communications Conventions Contents Chapter 1 Routing Signals with Your NI 2501/2503 Chapter 2 NI 2501/2503 Operation Appendix A Specifications Page Routing Signals with Your NI2501/2503 About the NI2501/2503 Analog Bus Triggers Cold-Junction Sensor Channel NI 2501 Amplifier Connecting Signals Front Connector Figure 1-1. Front Connector Pinout Assignments for Two-Wire Mode National Instruments Corporation 1-5 NI 2501/2503 User Manual Figure 1-2. Front Connector Pinout Assignments for One-Wire Mode NI 2501/2503 User Manual 1-6 National Instruments Corporation Figure 1-3. Front Connector Pinout Assignments for Four-Wire Mode National Instruments Corporation 1-7 NI 2501/2503 User Manual NI 2501/2503 User Manual 1-8 National Instruments Corporation Figure 1-4. Front Connector Pinout Assignments to Create a 6 x 4 Matrix Page Contact Protection Terminal Blocks Software Choices NI-SWITCH Driver Software National Instruments Application Software Third Party Software NI 2501/2503 Operation Functional Overview Chapter 2 NI2501/2503 Operation Figure 2-1. NI2501 Module Block Diagram NI 2501/2503 User Manual 2-2 Front Connector PXIbus Connector Chapter 2 NI2501/2503 Operation Figure 2-2. NI 2503 Module Block Diagram National Instruments Corporation 2-3 NI 2501/2503 User Manual Multiplexer Two-Wire Mode One-Wire Mode Four-Wire Mode Matrix Mode Switch Control Circuitry Random Scanning PXI Interface Triggers External Trigger Input Scanner Advanced Modes Initiating Scanning Multicard Triggering A Specifications NI 2501 Input Characteristics Transfer Characteristics Channel Amplifier (Unity Gain) Cold-Junction Sensor Channel Amplifier (Unity Gain) Dynamic Characteristics PXI Bus Interface PXI Trigger Bus Power Requirement Physical Environment Shock and Vibration Certifications and Compliances CE Mark Compliance NI 2503 Input Characteristics Transfer Characteristics Dynamic Characteristics PXI Bus Interface PXI Trigger Bus Power Requirement Page B Accessories C Customizing Your Card Current-Loop Receivers Page D Architecture Drawings Appendix D Architecture Drawings Figure D-1. NI 2501 Switch Architecture NI 2501/2503 User Manual D-2 National Instruments Corporation Bank1 BC01 HLSELECT Figure D-2. NI 2503 Switch Architecture National Instruments Corporation D-3 NI 2501/2503 User Manual Bank1 BC01 Bank3 BC23 Common Questions Page F Customer Communication Electronic Services Bulletin Board Support FTP Support Fax-on-Demand Support Telephone and Fax Support Country Telephone Fax Technical Support Form NI 2501/2503 Hardware and Software Configuration Form National Instruments Products Other Products Page Documentation Comment Form Title: NI 2501/2503 User Manual Edition Date : Part Number: 321906B-01 Mail to:Technical Publications Fax to: Technical Publications Glossary Symbols A B C D Page N P R S T V Page Index Numbers A B C G I L M N P Q R S T V