Connect the 4-wire cable from the digital audio matrix board to the PT1001-A1. Make sure that the cable is fixed on the front door and in the cabinet with pull reliefs. The cable should give enough room to open the cabinet door completely.
Connect the 4-wire cable with the 2-pole connector PT1001-A1 24 V and the 3-pole to RS485. Connect the other end of the cable to the digital audio matrix board RS485 connector '1-RS485'. See PACE-Bus RS485.