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Description
Overview
Essential details：RER133 Bus Connection Module ABB
The RER 133 Bus Connection Module acts as an interfacing unit between an RE_54_ host device and a SPA, Modbus or DNP 3.0 system. The RER 133 module converts RS-232 signals to RS-485 signals. 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_ 54_ host device. RER 133 is not a stand alone device. An RE_ 54_ 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.
A RER 133 delivery includes the RER 133 Bus Connection Module, a connection cable (1MRS120542) and this manual.
RER133
The RER 133 Bus Connection Module is designed to work with RE_ 54_ products. The module utilizes the RS-232 communication port located on the rear panel of the RE_ 54_. The module is not designed to be connected to any other ABB product, nor to any third party products.
The signal levels and the functionality of the RER 133 module are defined in the RS-485 standard. RER 133 module is a regular type of RS-485 interface, meaning that a maximum of 32 nodes can be connected in a daisy chain type of bus configuration.
Collision detection on the RS-485 bus is supported when a maximum of 32 nodes are connected to the same daisy chain. In order for collision detection to operate, the communication speed has to be set to 4800, 9600 or 19200 bits/s. These speeds are set by using the DIP switches on the front of the module. For an example on how to set these DIP switches, please see section ìModule configurationî on page 9. When
collision detection is not used, the communication speed does not have to be set.
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