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# Digital I/O Considerations for C Series Devices

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.