Modbus relay

Need some help. I have a modbus relay and to turn on and off I have to write FF 00 for on and 00 00 for off to the relay with function code 5 (Write to single relay) how do I do it in jigsaw? Byte 1 adress byte 2 function code byte 3 4 adress of register (big-endian) byte 5 6 data of register (big-endian).