The Modbus module MR-Multi-I/O is a compact and quick-to-install solution for connecting digital and analog signals from the actuator and sensor level directly to a control or regulating unit in building automation via the Modbus RTU protocol. There are 29 I/Os to choose from for various tasks, some of which are configurable. In the case of strong inductive loads, the relay contacts must also be protected with an RC element. With a Modbus master, the inputs and outputs can be switched and queried via standard registers. The module address, bit rate and parity are set using two rotary switches on the front or via software. Suitable for decentralized installation on TH35 mounting rails in accordance with IEC 60715 in electrical distribution boards.