B9 - 3 wire is all the model 100 / 200 actually uses unless you're using HTERM or you like the godlike simplicity of the cable check lockup, or you cannot disable the cable check in software. Given that it wasn't actually using flow control I see no reason to make a simple 3 wire cable fail. It's punishingly opinionated. Sort of like Frank Lloyd Wright building interior walls at an angle because he didn't like people hanging pictures in the houses he made for them.
Generally prefer full null cables since they work with everything. Except... this embedded wimodem seems to be a different beast. It appears it doesn't set DSR high, and it doesn't implement the jumpers it is supposed to have to set it. So proper through wiring doesn't work. So you have to defeat it in the connector. And modifying the t200 rom is probably not an option either. > -- John.
