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Table Of Contents

Digital I/O Considerations for C Series Devices

Last Modified: April 18, 2018

Digital I/O module capabilities depend on the type of digital signals that the module can measure or generate and the chassis the module is used in.

The NI 9375, NI 9403, NI 9425, NI 9426, NI 9476, NI 9477, and NI 9478 are serial digital I/O modules.

The NI 9344, NI 9401, NI 9402, NI 9411, NI 9421, NI 9422, NI 9423, NI 9435, NI 9436, NI 9437, NI 9472, NI 9474, NI 9475, NI 9481, NI 9482, and NI 9485 are parallel digital I/O modules.

The following table shows what types of tasks these modules can perform in the different chassis.

Chassis Tasks
cDAQ-9132, 9133, 9134, 9135, 9136, 9137, 9138, 9139, 9171, 9174, 9178, 9179, 9181, 9184, 9185, 9188, 9188XT, 9189, and 9191 Serial and parallel modules:
  • Software and hardware-timed digital input/output tasks[1]
Parallel modules:
  • Counter/timer tasks
  • Accessing PFI signal tasks (can be used in up to two slots)
  • 1 Timed digital input/output restrictions:
    • You cannot use parallel and serial modules together on the same hardware timed task, unless they are in separate cDAQ chassis using multichassis device tasks.
    • You cannot use serial modules for triggering.
    • You cannot do both static and timed tasks at the same time on a single serial module.
    • You can only do hardware timing in one direction at a time on a serial module.

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