Mine refuses to work without RTS/CTS on. DTR is a must for TS-DOS. So it looks like the 200 needs both enabled or both as a loop back.
Kurt On Thu, Jul 18, 2019, at 4:33 PM, Jim Anderson wrote: > > -----Original Message----- > > > > Agreed. TELCOM only uses XON/XOFF. > > > > I'm curious about this so I'll dust off my 200 and do some testing. > > Here's where I got to: > > The flaw in my methodology was testing TELCOM with nothing plugged in (on the > assumption that if it isn't paying attention to hardware flow control lines > for flow control purposes, it shouldn't be paying attention to them at all). > When I plugged it in to the cable to my PC which I was using for talking to > Mcomm, TELCOM works fine and doesn't lock up. > > I also noticed that when nothing is plugged in, TELCOM only actually freezes > after you type one or more characters. It lets you quit with F8 as long as > you don't send anything. > > The serial cable for this particular TNC (basically, a radio modem) has only > 3 wires, because it goes to a 2.5mm TRS audio-style plug which plugs into a > handheld radio transceiver (Kenwood TH-D7A, if anybody is curious). The > handheld radio has a built-in TNC and the cable only carries the TD, RD, and > SG RS-232 signals. The other end of the cable has a DB-9 female plug and is > wired DCE to plug into a PC. > > Fortunately, the DB-9 plug comes apart, so I didn't spend a lot of time > experimenting with which signals it needed, I just jumpered RTS to CTS and > DTR to DSR, and now the T200 is perfectly happy to talk to it. Maybe it only > needed DSR, or maybe it only needed CTS, but once I had the soldering iron > out I was more interested in getting it working than fiddling around, sorry. > > > > > > > > jim > >
