MODBUS Schneider Automation uses an open data communications network called Modbus as the basis for the exchange of information among products on the factory floor. In a typical Modbus network, Modbus messages are sent over an RS232 asynchronous serial communication link (EIA standard). This link inputs and outputs data alternately rather than concurrently. The two modes of communication within Modbus are 10-bit ASCII and 11-bit RTU.

The common language used by all Modicon controllers is the Modbus protocol. Modbus is the de facto industry standard, with support from over 500 industrial suppliers. On-line programming or data acquisition applications are easily supported directly from the serial port of any computer. Modbus can be used in either a simple point-to-point manner with a pair of devices or in a network architecture with up to 247 slave devices.

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Last modified: July 18, 2002