Inter-M 4 button wall remote control device for ARM-911A. Cat5 connection

ARM-911A Remote Control LM-911 is wall remote control device to control the ARM-911A’s first 4 audio sources in a remote location by synchronising with the ARM-911A. It connects to the RM contact port of ARM-911A, and uses the RS-422 communication method. By pushing any of the 4 different buttons on