As the oldest industrial automation communication protocol, Modbus has become a standard language for connecting automation devices and equipment, allowing communication within a network or industrial setting.

Although Modbus was originally designed for Serial networks, it now supports message transmission over Ethernet and TCP/IP.

Developed and managed by the Modbus organization, it has evolved into a free open-source tool that provides an automation protocol for industrial devices. Modbus primarily operates over serial lines, supporting RS-232 and RS-485 serial communication standards, and it is also compatible with Serial RS-422 and Ethernet.

The versatility and reliability of Modbus have made it a preferred choice for many industries, including manufacturing, energy, and transportation. Its ease of implementation and robust performance in various industrial environments ensure that it remains a crucial component in the realm of industrial automation and control systems.