Paul Coccoli wrote: > Hmm...so if DTR is set to +13V (0) and RTS is set to -13V (1) for > example, then I can use switches connected to CD, DSR, and CTS so that > each pin can read 0 or 1. Is that correct? That sounds correct. > Where do the resistors > go? Between DTR and the 3 switches and RTS and the 3 switches? I'd be inclined to put series resistance onto each DB9 pin you utilise. In the event of a damaged cable this would limit any short circuit currents to levels which shouldn't cause irreparable harm. If it were my motherboard/serial-port, I'd find the highest value resistance that reliably works between DTR and an input (hint: use a variable resistor and measure it's value when disconnected): I'd then use fixed resistors of at most half that value. > Thanks for the suggestions, Rob. You're welcome. I look forward to seeing a footswitch-virmidi app soon :) Rob
