using System.IO.Ports;

​

public class Program

{

    public static void Main()

    {

        SerialPort port = new SerialPort("COM4", 9600, Parity.None, 8, StopBits.One);

        port.Open();

        byte[] data =

        {

        0x1B, 0xC1, 0xA4, 0x06, 0xA4, 0x06, 0xA4, 0x06, 0xA4, 0x06, 0xA4, 0x06, 0xA4, 0x06, 0, 0, 0

        }

​

        ;

        byte Sum = 0;

        for (int i = 0; i < 14; i++)

            Sum += data[i];

        data[16] = Sum;

        port.Write(data, 0, data.Length);

        port.Close();

    }

}