The module REP485 is an amplifier of interface signals used by serial data interconnection standard RS485. It is intended to amplify signals when building networks comprising of many devices or long data lines. Usually this is necessary when the number of the devices in one segment of the network is bigger than 32 or the length of the line id more than 1 km.
The module CRS485 is an interface transmitter between the serial data interconnection standards RS232 and RS485. It can be used to make a connection between two devices with different interfaces, as well as for implementation of “MASTER SLAVE” type networks.