Open collector inputs

[mmcgahan]

The ATE system I want to build with a CompactDAQ platform includes open collector inputs. Is the NI-9361 the only module with internal switchable pull-up resistors?

[santo_13]

So, to rephrase, you're looking for Digital Inputs with internal pull-up to allow reading signals from open-collector outputs.

Why is the internal pull-up so important?, you can externally add those pull-ups and then you have much larger selection of C-series input modules.

[mmcgahan]

Yes, that is true. Internal pull-ups are are not essential. I was just trying to determine if there were internal pull-up options available other than the 9361 module. Thanks for your reply.

[santo_13]

Looks like NI-9422 also supports open-collector signals.