NI 9425E Operating Instructions and Specifications
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© National Instruments
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5
Each channel has a DI pin to which you can connect a digital input
signal. The NI 9425E has four common pins, COM, that are
internally connected to the isolated reference of the module.
The NI 9425E has sinking inputs, meaning that when the device
drives a current or applies a voltage to the DI pin, the pin provides
a path to COM for the current or voltage. The NI 9425E internally
limits current signals connected to DI. For more information about
input current levels, refer to the
You can connect 2-, 3-, and 4-wire sourcing-output
devices to
the NI 9425E. A sourcing-output device drives current or applies
voltage to the DI pin. An example of a sourcing-output device is an
open collector PNP.
