COMMUNICATIONS CONVERTER FOR CONTROL CABLE FOR ASYNCHRONOUS DATA END UNITS OPTICAL <-> ELECTRONIC (PILOT WIRE) CONVERTER TO ASYNCHRONOUS SERIAL COUPLING OF DEVICES WITH ASYNCHRONOUS INTERFACE 7SD51/7XV5663 TO 2 CORE PILOT WIRE CABLE UP TO 10 KM CONNECT. OPTICAL 820NM/ST-PLUG TO 62,5/125MU- METER MULTIMODE FIBER UP TO 1.5KM TO THE PROTECTION DEVICE ELECTRICAL WITH SCREW TERMINALS TO THE PILOT WIRE(5KV ISOLATED)