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modjn

Modbus TCP client/server implementation in Java with Netty 4.x

Currently implemented modbus functions

  • READ COILS | 0x01
  • READ DISCRETE INPUTS | 0x02
  • READ HOLDING REGISTERS | 0x03
  • READ INPUT REGISTERS | 0x04
  • WRITE SINGLE COIL | 0x05
  • WRITE SINGLE REGISTER | 0x06
  • WRITE MULTIPLE COILS | 0x0F
  • WRITE MULTIPLE REGISTERS | 0x10

Usage

Server

implement ModbusRequestHandler for server business logic, example here...

ModbusServer modbusServer = new ModbusServer(502);

try {
    modbusServer.setup(new ModbusRequestHandler());
} catch(ConnectionException ex) {
    System.out.println(ex.getLocalizedMessage());
}

modbusServer.close();

Client

switch to async requests by passing an instance of ModbusResponseHandler to the setup function and handle responses by yourself

ModbusClient modbusClient = new ModbusClient("localhost"; 502);

try {
    modbusClient.setup();

    ReadCoilsResponse readCoils = modbusClient.readCoils(12321, 10);

    //modbusClient.[other functions] ...

    System.out.println(readCoils);
} catch (NoResponseException | ErrorResponseException | ConnectionException ex) {
    System.out.println(ex.getLocalizedMessage());
}

modbusClient.close();

modjn's People

Contributors

gandev avatar klymenek avatar

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