Modbus connections

Use modbus with the most popular connection types, like RS485, TCP and UDP. The last two can be transferred with a simple LAN cable. Unlike RS485 which requires at least two wires. Check the RS485 website for further details. Collect some information to select the connection you need.


RS485
It is a connection between a master and slaves. You can use 2 or 4 wires per slave, depending on half-duplex or full-duplex connection. Each slave is connected to a common GND. The RS485 wiring can use RTU and ASCII data formats. Do not forget to power each slave with a required voltage.
The basics of RS485 connection

TCP
The Transmission Control Protocol (TCP) is one of the main protocols of the Internet protocol suite. TCP is used extensively by many applications available by internet, including www, E-mail, File Transfer Protocol, Secure Shell, peer-to-peer file sharing, and streaming media applications.
Learn the TCP protocol basics

UDP
The User Datagram Protocol (UDP) is one of the core members of the Internet protocol suite. Applications that do not require reliable data stream service may use the User Datagram Protocol. It provides a connectionless datagram service that emphasizes reduced latency over reliability.
See the UDP protocol basics

More information