I'm using a 6259 DAQ card to sink some FETs, which in turn sink some solenoids. I have 10 of these, and it works fine. However, lets say I just want to test one solenoid. When I just install one solenoid, it will not work. I have to have all the solenoids hooked up, or at least some kind of load, to get just one solenoid to work. Note that when the solenoid is disconnected, the FET is still there, although there's no load for it. I understand why that particular line, with the missing load, may be flaky, but why does that interfere with the line that is loaded?

Multifunction DAQ

Can't have floating D.O. lines even for unsued pins?

Author

Thanks for the information S_.

5V isn't available on the UUT. I think we need a much stronger pullup, but that is also part of the UUT. It's obvious that the load satisfies part of the requirement of pulling up the line.

Richard

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Multifunction DAQ

Can't have floating D.O. lines even for unsued pins?

Re: Can't have floating D.O. lines even for unsued pins?