SEL-351S to Centum VP Communication Via MODBUS

I try to communicate sel-351s relay to Centum vp (DCS) via Modbus RTU. when I go online with the relay, I did not find the ModBus protocol on the relay. only I found the DNP, MBB, SEL etc. I try to set it using command line access level 2: =>>SET P 3 enter and is show the Protocol (DNP, MBB, SEL.....) PROTO=SEL ?___ when I did put the MOD is show the message: Out of range.

Help please