Technical Guide P12y/EN FT/D22
User Guide
MiCOM P125/P126/P127 Page 107/108
5.4 Output Relays
The number of logic outputs depends on the relay model. The relays have
configurable logic outputs, which may be assigned to any available function.
The normally closed (NC) contact of the Watchdog (RL0) is not configurable. The
other contacts are configurable to functions available in the relay. A basic output
matrix is included in the relay. Some logic outputs have changeover contacts.
Logic outputs for each relay model:
Model P125 P126 P127
Logic outputs 6 8 8
The first logic output (RL0) is allocated to signalling a relay fault (Watchdog, WD) and
is not counted in the above table .
5.5 Communication
5.5.1 RS485 Rear Communication Port
All MiCOM relays have a RS485 rear communication port.
The terminals 29-30-31-32 are dedicated to the RS485 communication port. See
wiring diagrams in Annex 1 of the Technical Guide.
5.5.2 RS232 Front Communication Port
MiCOM P125, P126 & P127 relays provide the user with a RS232 communication
port on the front panel. This link is dedicated to MiCOM setting software.
The cable between the relays and the PC is a standard RS 232 shielded cable.
The relay requires a RS232 cable with a 9-pin male connector.
The wiring of the RS232 cable must be as follows:
RS232 PC PORT
9 pin male connector
MiCOM P125/6/7 end
9 pin female connector
P0073ENa
FRONT PANEL PORT COMMUNICATION RS232 CABLE WIRING
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