The Modbus module with 4 digital inputs and 2 relay outputs is designed for local switching operations. It is suitable to receive for example light switches and window contacts in a room and to operate two light bands or to be used as sunblind control. It can also be used to control two motor driven fire dampers or for many other applications. We recommend to protect the relay contacts additionally by a RC-element or high inductive loads. The relays are provided with a manual control facility. Depending on the position of the jumper [below the faceplate] the inputs can be operated as contact and voltage inputs [A1, 24 V AC/DC; jumper J - A2] or with actuation to GND [A2; jumper J - A1. Inputs and outputs can be operated and scanned via a Modbus-Master. Setting of the slave address, bit rate and parity is done with the two address switches [x1 / x10] on the front. Possible settings are addresses 00 to 99 and bit rates 1200, 2400, 4800, 9600, 19200, 38400, 57600 und 115200 Bd.