The 5300 supports RS-485 in master or slave configurations for two or more connected networks.
April 3, 2012 - Control Technology added Modbus RS-485 multi-drop support as a standard feature to its Model 5300 Automation Controller. The 5300 supports RS-485 in master or slave configurations and can fill master and slave roles concurrently for two or more connected networks. Users can run a different protocol off each port on the Model 5300, with TCP, RS-485 and RS-232 all supported, serving as a bridge between different protocols.
Modbus is easy to set up and supports unique poll rates for slave devices.