Using this resource as inspiration, i have created a component for Max/MSP which can control two gates on the standard PC serial port. The software is in place; a max MSP component can be wired which creates a link with the physical COM port. Signals sent to the component will either toggle the RTS or DTR gates on the port from +9 to -9 volt.
Right now it only works on windows; macs do not have a serial port at all (i think).
If you’re interested, the source code is here: serialcontrol.c.
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