The thermostat supports the communication protocol (Modbus RTU mode) as per the Modbus specification (see http://www.modbus.org).
Device address
The device address is assigned to "1" (factory setting). Engineer/installer can change the address value via parameter P93 as needed.
Baud rate
The baud rate is selectable. Four settings are available for the Modbus network: Auto, 9600 bps, 19200 bps and 38400 bps (19200 bps is default).
Modbus data frame format
The Modbus data frame format can be set to 1 = 1/8/E/1, 2 = 1/8/O/1, 3 = 1/8/N/1 or 4 = 1/8/N/2 (1/8/E/1 is default).