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MiCOM relays. Do I need to use the password to read/ write information via modbus protocol?
MiCOM Px2 - there is no need to use any password for modbus communication
MiCOM Px3 - there is no need to use any password for modbus communication
MiCOM Px4 - there is no need to use any password for modbus communication in the most part of the firmwares

Exceptions are:
RangeMajor Firmware Version
P14x46, A0, B0B
P24xD0
P34xB0, E0, B1, E1
P44xC7, E0
P44yD0, F0, D1, F1, D2, F2
P54xD0, D1, D2
P64x03, B1
P74xB0
P746B2, C2
P841C0, D0, C1, D1, C2, D2
P849B0

In the mentioned above firmwares some read/write commands should be preceded by the level 3 password. The default one is "AAAA" or "AAAA    " (41 41 41 41 or 41 41 41 41 20 20 20 20 in hexa).

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