The following figure shows the hardware diagram for the NI PXIe-2738.

The following table lists relay names for the NI 2738.

Relays
kr0c0...kr0c31
kr1c0...kr1c31
kr2c0...kr2c31
kr3c0...kr3c31
kr4c0...kr4c31
kr5c0...kr5c31
kr6c0...kr6c31
kr7c0...kr7c31