On 5/6/05, Rob Fell <robin.fell@xxxxxxxxxxxx> wrote: > 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). > 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? Where do the resistors go? Between DTR and the 3 switches and RTS and the 3 switches? I'm going to refrain from making an ASCII diagram and hope I've made myself clear. Thanks for the suggestions, Rob. As for the other suggestions, my box does not have a parallel port or a gameport (Shuttle XPC). I think I can add a parallel port, but that would cost money. I've seen a number of DIY parallel port digital joystick interfaces, and apparently some of them even have kernel support. A joystick port would be great, since it gives you four analog signals (expression pedals/MIDI CCs). Alas, all I have is the lowly serial port.
