Abb is renowned for various types of communication units. The company offers fiber optic iec star coupler and rer 111 is a device that enables various modules to be interconnected over the lon bus. Salient features are as follows:
1 speed - 1.25 mbit/sec
2 multiple communication media
3 low maintenance
4 multi-vendor equipment
5 low support cost.
The rer 111 unit provides a star connection point where other lon devices can be connected. This is achieved by means of option cards, which are located in the nine slots available in the rer 111 unit. Another type star coupler is the rer 125 unit which functions as an inter connector of devices using the iec 60870-5-103 protocol.
