Tag: modbus

Modbus TCP Client Example

public class run {
	public static void main(String[] args)
	{
		ModbusClient modbusClient = new ModbusClient("127.0.0.1",502);
		try
		{
			modbusClient.Connect();
			modbusClient.WriteSingleCoil(0, true);
			modbusClient.WriteSingleRegister(0, 1234);
			modbusClient.WriteMultipleRegisters(11, ModbusClient.ConvertFloatToTwoRegisters((float) 123.56));
			System.out.println(modbusClient.ReadCoils(0, 1)[0]);
			System.out.println(modbusClient.ReadHoldingRegisters(0, 1)[0]);
			System.out.println(ModbusClient.ConvertRegistersToFloat(modbusClient.ReadHoldingRegisters(11, 2)));
		}
		catch (Exception e)
		{		
		}	
	}
}

Read an Write 32 Bit Values

    public static void main(String[] args) 
    {
        ModbusClient modbusClient = new ModbusClient("127.0.0.1", 1536);
        try
        {
            modbusClient.Connect();
            //Write Float value to Register 10 and 11
            modbusClient.WriteMultipleRegisters(9, ModbusClient.ConvertFloatToTwoRegisters((float)(1323.55)));
            //Write 32 bit value to Register 12 and 13
            modbusClient.WriteMultipleRegisters(11, ModbusClient.ConvertDoubleToTwoRegisters((1323554)));
            //Read Float Value from Register 10 and 11
            System.out.println(ModbusClient.ConvertRegistersToFloat(modbusClient.ReadHoldingRegisters(9, 2)));
            //Read 32 Bit Value from Register 12 and 13
            System.out.println(ModbusClient.ConvertRegistersToDouble(modbusClient.ReadHoldingRegisters(11, 2)));
        }
        catch (Exception e)
        {
        System.out.println(e.toString());
        }   
    }

References
https://www.youtube.com/user/emileackbarali/videos
https://www.udemy.com/the-1-hour-modbus-rs485-primer/
https://www.rtaautomation.com/technologies/modbus-rtu/
http://easymodbustcp.net/java-modbus-tcp-client-example
http://easymodbustcp.net/java-read-an-write-32-bit-values
https://en.wikipedia.org/wiki/Modbus