The RDF302, RDF302/VB and RDF302.B thermostats support communication protocol (Modbus RTU mode) as per the Modbus specification (refer to: http://www.modbus.org).
The device address range is from 1 to 247.
The device address can be changed via parameter P81. (factory setting = 1)
The available baud rates are 4800 bps, 9600 bps, 19200bps and 38400 bps.
The baud rate can be changed via parameter P68. (factory setting = 19200 bps)
The parity can be set to none (no parity), odd or even.
The parity can be changed via parameter P70. (factory setting = even)
Any change, e.g. device address, baud rate and parity, will become effective only after turning the power supply off then on again.