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Is it ok to connect only one of power supply V-,V+ of A and B connection on ACE949-2 for use data line of A and B?

ACE949-2 communication interface is used for 2-wire RS-485 communication and the serial ports A and B are used for daisy chain connectivity. 
So if it is using with the other sepam relays then you have to take all the terminals A & B for the wiring means all connection of power supply on all ports has to be done.
Refer the attached sheet for the connections and other details.
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