The ABB RER 103, also cataloged as the RER 103 Interface Unit, operates as a dedicated hardware component for optical-to-electrical signal conversion within RE500 devices platforms. This module translates incoming optical signals from SPA, LON, and IEC 60870-5-103 fieldbuses into balanced electrical RS-485 serial data streams. It plugs directly into the integrated 9-pin D-type serial port located on the rear chassis of the host terminal, providing galvanic isolation and noise immunity between the station bus and the internal processing electronics.
Hardware Specifications
Parameter
Specification
Model
RER 103
Brand
ABB
Origin
Finland
Weight
0.15 kg
Dimensions
35 mm x 73 mm x 20 mm (W x H x D)
Operating Temp
-10 deg C to +55 deg C
Power Consumption
Powered from the host device (5 V DC)
Interface Type
RS-485 electrical protocol conversion
Connector Type
9-pin D-type male plug
Bus Topologies
Loop and Star configurations
Data Transfer Rate
Up to 1.25 Mbps
Storage Temp
-40 deg C to +70 deg C
Backplane Bus Communication Velocity and Network Integration
The RER 103 links to host hardware architectures via a direct-mating 9-pin interface to ensure stable backplane bus communication velocity baselines up to 1.25 Mbps. It bridges localized hardware blocks to external Profinet or EtherNet/IP deterministic networks via protocol mapping proxies, sustaining fast transmission rings in both loop and star network topologies. The module maintains native firmware flash compatibility with the RE500 processor core, ensuring correct parity verification and line termination constraints are enforced across all connected communication channels during I/O density scaling procedures.
