Modbus
Modbus is a high-level communication protocol, initially developed for data transfer on an RS-232 serial line and later included in the TCP-IP frame, that exceeds the transfer speed limit imposed by the physical means.The protocol is based on the exchange of messages between devices in master/slave or client/server mode.Industries use many versions of Modbus, the most important being:
- Modbus/RTU: for asynchronous serial communication on RS-232 and RS-485 interfaces
- Modbus/TCP: for data exchange on Ethernet networks