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:

Range	Major Firmware Version
P14x	46, A0, B0B
P24x	D0
P34x	B0, E0, B1, E1
P44x	C7, E0
P44y	D0, F0, D1, F1, D2, F2
P54x	D0, D1, D2
P64x	03, B1
P74x	B0
P746	B2, C2
P841	C0, D0, C1, D1, C2, D2
P849	B0

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).

Released for:Schneider Electric Nigeria