Schneider Micom P123 trigger Output Relay
If anybody is still interested, I managed to trigger the relay. I guess the problem was, my own lack of knowledge on how these relays work. Basically, in each of these devices, there are built FUNCTIONS which we can program/assign which of the 8 relays to trigger. And it is assignable using the device's front panel.

For example, to use Trip TC and Close TC function, we can goto the front panel menu and set the bit for each of the relay. Lets say, under Trip TC function, I want to turn on, relay 3,4 and 5. So under the menu:

Close TC
87654321
00011100


Then, when we send command to this function Address (func: inf: no: ), then all three relays will turn ON. To turn them off, assign the following to another function and send command to it.

Trip TC
87654321
00000000


That's all.