Distributed peer-to-peer micro-controller network based on RS-485 protocol

The authors introduce a distributed peer to peer micro controller network based on RS 485 protocol design, to meet the developing trend of control systems from concentration systems to distribution networks. With a hardware software communication module design, it implements CSMA/CD on multi node RS 485 bus, and enhances the extension and reconfiguration abilities of the system by design and implementation of repeater and network development platform. A practical system constructed in the lab verifies the feasibility of the design, and shows that the design breaks the common master slave RS 485 communication mode. It is much practicable to those low cost distributed control networks, implemented by interconnecting MCUs or PLCs.