Modbus/TCP is an open M2M protocol designed for communication among various devices. The communication takes place by exchanging data messages between a client and a server in a master-slave mode.
Modbus can be used to transfer data over various networks and buses (master-slave)
  • Modbus/RTU is a protocol that uses the RS-485 bus. It is frequently used in industrial applications, such as when connecting PLCs to displays, I/O interfaces and so on.
  • Modbus/TCP extends the previous Modbus/RTU protocol and is used in LAN (Ethernet) networks. The advantage of Modbus/TCP is its openness and compatibility with a wide range of industrial devices. Disadvantages of Modbus/TCP include a total lack of any security.


Modbus/TCP is frequently used in

  • PLC  (industrial controllers)
  • SCADA systems (visualizations and basic control of industrial processes)
  • Sensors and actuators


In the context of NETIO products

  • NETIO devices support Modbus/TCP as of FW version 3.1.0.
  • PowerCable Modbus 101x supports Modbus/TCP since the first product version.
  • NETIO supports reading from/writing to the power output as a “coil”.
  • NETIO supports reading from/writing to the power output using actions 1 to 5 (writing via registers).
  • NETIO supports reading Power measurement values (all measured parameters).


NETIO specification of the Modbus/TCP M2M protocol: Download page

See: NETIO AN27 Modbus/TCP with NETIO 4x – Control and measure LAN power sockets




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