Modbus RTU
The controller can be controlled with Modbus RTU. The Master has to support function code 2Bh MEI Type 0Dh (Encapsulated Interface Transport) in order to set parameter. Otherwise a parametrising via the configuration file is also possible (see chapter Configuration file).
RS-232 and RS-485
When using connector RS-485 keep in mind setting jumper J1 and J2 to the correct position (see also chapter Jumper J1/J2). For the use of the RS-232 interface only the correct connector is to be used, a configuration is not necessary.
The "Two-Wire Modbus Interface" in accordance with EIA/TIA-485 (RS-485) standard is supported.
In principle the Modbus RTU can be used on RS-232 and RS-485 in parallel. An unused bus can be switched off with the objects 2102h. The object 2103h tells the active field busses.