ABB REG316 4 Series Operating Instructions Manual page 691

REG 316*4 1MRB520049-Uen / Rev. E
9. INTERBAY BUS (IBB) INTERFACE
9.1. Connection to a station control system
An electrical-to-optical converter Type 316BM61b is plugged
onto the rear of the protection to convert the electrical RS232
signals from the 316VC61a or 316VC61b into optical signals.
Fig. 9.1 Electrical-to-optical converter Type 316BM61b
RS232 interface:
Pin 2: Rx
Pin 3: Tx
Pin 4: +12 V
Pin 5: 0 V
Pin 9: -12 V
ABB Switzerland Ltd
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9-3