With the EASY-COM-RTU-M1 communication module, a Modbus RTU connection can be established as a master or slave with a control relay from the easyE series. If the module functions as a master, the participants can be connected to the easy control relay at the field level in order to parameterize, monitor and control them and to record data. In its function as a slave, data is exchanged with a higher-level system. The connections are made using screw terminals.