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Services
Modbus Messaging Service Description
The Modbus Messaging Services
The Modbus messaging service handles the transfer of data or commands between two devices.
One device is the client and the other is the server. The client initiates the request and the server
responds to the request. These services use the Modbus protocol (or Modbus over TCP/IP in
Ethernet applications) to support the data transfer between devices.
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SCADA and HMI data requests
PLC data transfer
device data gathering
Modbus Communication Standard
Modbus has been the industrial communication standard since 1979. It is now combined with
Ethernet TCP/IP to support Transparent Ready solutions.
Modbus over TCP/IP is a completely open Ethernet protocol. The development of a connection to
Modbus TCP/IP requires no proprietary component or license purchase. The protocol may be
easily combined with any device that supports a standard TCP/IP communication stack.
Specifications can be obtained free of charge from www.modbus.org.
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