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Second RS485 port detail in MiCOM P127 Relay

Published date: 06 August 2019

P127 MiCOM relays have one RS485 rear communication port by default. The terminals 29-30-31-32 are dedicated to the RS485 communication port.
An optional RS485 port is available on P127 which is 2nd RS485 based on cortec/mode number selected. The terminals 77-78-79-80 are dedicated for this. 

In order to avoid a transmission conflict between the two RS485 ports (optional configuration), transmission using the second port can be time-delayed. Transmission and reception with comm2 will start after the end of the “Command duration”.
Setting range available: from 0.1 to 30s, step 0.1s 

For more details please refer below links for documents: 
ID => 671732406
Title => MiCOM P125,P126&P127 P12y/EN M/Fa5 Technical Manual
URL =>

ID => FA340757_en
Title => How to do the connection and wiring for MiCOM P127 relays ?
URL =>


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