The bus connection module RER 133 acts as an interfacing unit between a RE_541/3/5 host device and a Modbus or DNP 3.0 system.
The RER 133 module converts an RS-232 signal to an RS-485 signal. RS-485 can be connected by using 2- or 4-wire mode.
The RER 133 module is connected by a cable to the RS-232 D-type connector marked X3.2 on the rear panel of the RE_541/3/5 host device. RER 133 is not a stand-alone device. A RE_541/3/5 host
device is always required to power the module. No external power supply is supported.
RER 133 supports communication speeds from 300 to 19200 bits/s. Collision detection and collision avoidance is supported for communication speeds 4800, 9600 and 19200 bits/s.