Thanks for the reply.
Its a Modbus TCP IP communication between Unistream 10 and V700. V700 has a timer to control the water heater not to work forewer but to stop after some time. With Unistream I am doing building management system where I have separate slaves such as air control units and 3 v700. Where to find the timer in Unistream Modbus section, I see only coils and registers, do the timers start at certain registers?