Maintained by: Michael Oberdorf IT-Consulting

Source code: GitHub

• latest, 1.1.2

The Modbus TCP Server is a simple, in python written, Modbus TCP server. It listens to port 5020 and respond to any register types with a 0x0000. The Modbus registers can be also predefined with values.

Step - 1 : Pull the Modbus TCP Server

docker pull oitc/modbus-server

Step - 2 : Run the Modbus TCP Server

docker run --rm -p 5020:5020 oitc/modbus-server:latest

Step - 3 : Predefine registers

The default configuration file is configured to initialize every register with a 0x0000. To set register values, you need to create your own configuration file.

An example can be found in the GIT repo: abb_coretec_example.json

docker run --rm -p 5020:5020 -v ./server_config.json:/server_config.json oitc/modbus-server:latest -f /server_config.json

{
"server": {
  "listenerAddress": "0.0.0.0",
  "listenerPort": 5020,
  "tlsParams": {
    "description": "path to certificate and private key to enable tls",
    "privateKey": null,
    "certificate": null
    },
  "logging": {
    "format": "%(asctime)-15s %(threadName)-15s  %(levelname)-8s %(module)-15s:%(lineno)-8s %(message)s",
    "logLevel": "DEBUG"
    }
  },
"registers": {
  "description": "initial values for the register types",
  "zeroMode": false,
  "initializeUndefinedRegisters": true,
  "discreteInput": {},
  "coils": {},
  "holdingRegister": {},
  "inputRegister": {}
  }
}

{
"server": {
  "listenerAddress": "0.0.0.0",
  "listenerPort": 5020,
  "tlsParams": {
    "description": "path to certificate and private key to enable tls",
    "privateKey": null,
    "certificate": null
    },
  "logging": {
    "format": "%(asctime)-15s %(threadName)-15s  %(levelname)-8s %(module)-15s:%(lineno)-8s %(message)s",
    "logLevel": "DEBUG"
    }
  },
"registers": {
  "description": "initial values for the register types",
  "zeroMode": false,
  "initializeUndefinedRegisters": true,
  "discreteInput": {},
  "coils": {},
  "holdingRegister": {
    "123": "0xAABB",
    "246": "0x0101"
  },
  "inputRegister": {}
  }
}

    modbus-server:
      container_name: modbus-server
      image: oitc/modbus-server
      restart: always
      command: -f /server_config.json
      ports:
        - 5020:5020
      volumes:
        - ./server.json:/server_config.json:ro

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