CONVERTER OPTICAL FIBRE CABLE 820NM TO RS485 LINE STRUCTURE UP TO 115KBAUD AUXILIARY SUPPLY 24-250V DC AND 110/220V AC WITH ALARM RELAY CONNECT. PROTECTION RELAYS WITH RS485 INTERFACE VIA 9POL. SUB-D-PLUG GLASS FIBRE CONNECTION FOR 62,5/125MU-METER MULTI-MODE FIBRE VIA ST-PLUG