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The transparent and open protocol communication
Introduced in 1979 by Schneider Electric (Modicon), the Modbus® fieldbus is an essential, open communication standard, supported by a large number of products and vendors on the market today.
With over 7 million nodes in North America and Europe alone, Modbus is the de facto standard in multi vendor integration.
In a typical Modbus network, messages are sent over an RS232/RS485 serial communication link (EIA standard). The Modbus protocol is based on a master/slave principle, eg. the master sends a request and the addressed slave sends back a response.
As Modbus is a protocol which is independent of the physical network layer, Modbus serial line can be integrated seamlessly into Modbus TCP networks, using simple gateways. This is transparent for the Client application.
A "de facto" standard and the most widely used network protocol in the industrial manufacturing environment