Simple serial push button switch.

    badgerxb
    Feb 19 2014 | 8:44 pm
    Is it possible to monitor a serial port for a simple push button switch that would cross two pins of a rs232 port? I am looking for a way to trigger an event in a patch with a simple push button switch, using an Arduino board seems over kill.
    Here is an example I found on the net using a Python Serial Port Extension
    http://www.jezra.net/projects/serial_switch
    • balam
      Feb 19 2014 | 9:26 pm
      Hack an old keyboard simple and not need of extra software / just max and key events
    • badgerxb
      Feb 19 2014 | 10:30 pm
      Good suggestion but I was hoping to run the switch some distance from the computer over a XLR cable. The higher voltage would let me place the switch at some distance and the XLR connectivity allow for easy rigging and derigging.
      Messing around in Realterm, a serial terminal program, I can see handshaking going on.
      CTS, Clear to send, when pins 4 and 7 or 7 and 8 are crossed. DCD, Data Carrier Detected, when pins 1 and 4 are crossed. DRS, Data Set Ready, when pins 4 and 6 are crossed.
      I am not sure how or if max acknowledges these. This forum string from 2006 doesn't look promising https://cycling74.com/forums/serial-flow-control-rtscts-handshaking/