ABB REF 54 Series Technical Reference Manual, General page 79

1MRS750527-MUM Feeder Terminal
Technical Reference Manual, General
to NCC
Modbus
Modem
RS232C
RS232 / isolated RS485
converter
2W or 4W connection
REX 521
REX 521
CAP 501
Fig. 5.1.13.9.-8 Modbus- and SPA-based substation automation system
C
E
Fig. 5.1.13.9.-9 IEC61850-based substation automation system
master
REF 54_ terminals
RER 133 connected to X3.2
Modbus
RER 103 connected to X3.3
RER 133
REX 521
RER 103
Optical SMS-bus (SPA, loop)
REF 54_
SMS 510
RS232C
SPA-ZC 22
A050778
A050779
79