FBs-CM5H is a RS485 repeater module of FBs-PLC series. This module is designed for stand along operation and can work not only with the FBs-PLC but also other brands of controller. The feature of isolation between each ports protect this module from damaging when the voltage difference between the sub systems is high. This module can concentrates the multiple RS485 bus segments into one unify RS485 network. The RS485 network can only suit for bus structure topology, when there is a need to deploy the star topology then using this module is a right answer. While installation, the module can be mounted on DIN-Rail or securely be fastened by screw.