Paul Coccoli wrote: <snip> > I've figured out this much: you can wire a simple loopback by > connecting DTR to DCD and DSR and connecting RTS to CTS. What if you > insert a switch between these? E.g. connect RTS to the sleeve pin of > a female 1/4" TS jack and CTS to the tip pin. Could you then plug in > a sustain pedal? > > I've seen software that monitors the state of the pins on the serial > port, so I'm not worried about that part. I'm just not sure if the > hardware would work. Like when the switch is open, do you connect CTS > to ground? I don't know enough about this stuff. Hello Paul The answer is - it depends a little on your hardware :) A few points; 1. RS232 is nominally a +/- 13v (ish) system - you don't want to ground anything. 2. It's an I/O port, and should be safe against short circuits, but I'd recommend using at least 1K series resistance when you're poking around there :) 3. The RS232 inputs should have pull-ups/downs to bring them to valid levels when disconnected. In summary - with 99% of normal sane hardware, it should work (but I'd recommend the precaution of a 1K resistor). Best of luck Rob
