On Wed, Nov 29, 2017 at 2:53 PM, Ron Lauzon <[email protected]> wrote:
> > I broke out the RS-232 shifters that supports DSR/DTR and set them up > to loopback on the RS-232 side, but I couldn't get them to work. > I have a couple of things I need to check, but I think those shifters > simply don't work. > > Hello Ron, Some confusion here, at least as to what I'm suggesting. DSR / DTR loopback is completely on the Model 100 side of the cabling. Has nothing to do with the level shifter or the Arduino. Imagine on the M100's DB25, directly wiring the M100's DTR pin to M100's DSR pin. That's it. So if you have a custom cable you're just shorting one pin to another at the DB25 end. No wire in the cable is involved, just at the connector. The old Club100 "comp-link" cable did this. It completely defeats the M100's DSR check, since whenever serial port is activated, the DTR is kept asserted. -- John.
