Defining the audio/rs-232 wire pair, E pair (pins 3 and 6) for each tp input (see, Defining the audio – Extron Electronics MTPX Plus 6400 Series User Guide User Manual

Defining the audio/rs-232 wire pair, E pair (pins 3 and 6) for each tp input (see, Defining the audio | Rs-232 wire pair | Extron Electronics MTPX Plus 6400 Series User Guide User Manual | Page 61 / 166