I am trying to emulate the open-collector output of a fan tachometer, which outputs either Low or Hi-Z, with a cRIO module. I haven't been able to find any, however, that will accomplish this; the best I could find was switching the IO direction on a 9401 between input and output, but four of the eight channels must be set to input/output at a time and the switching time between directions is unspecified. Am I overlooking something?
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