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Thread: Com Port and Resistance

  1. Apr 15th, 2002, 12:14 PM #1
    Jeff Carlin
    Jeff Carlin is offline

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    Com Port and Resistance

    My client has a device that he wants to monitor. It has 3 buttons on it and, according to him, when each button is pressed, it lowers the resistance on a specific pin. I have the device connected to my Com 1 input, but I see nothing there using MsComm Control (using the .Input property). The port opens ok, but nothing is there. Anybody out there with a plan??

    Thanks,
    Jeff
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  2. Apr 15th, 2002, 01:00 PM #2
    jim mcnamara
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    Assuming I understand what you're doing -

    The RS232 specification senses voltage changes, not resistance changes. You will have to install some kind of intermediate device that detects delta Ohms, and sends a signal to the COM port. There a lots of digital VOM's out there, some of which offer continous output signals of different types.

    Start with a local Radio Shack if you're in the US.
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