private void button1_Click(object sender, EventArgs e)
        {
            ASCIIEncoding ascii = new ASCIIEncoding();

            Byte[] bt = ascii.GetBytes("WB20G4NBBW041696");

            //87
            //66
            //50
            //48
            //71
            //52
            //78
            //66
            //66
            //87
            //48
            //52
            //49
            //54
            //57
            //54

            foreach (Byte b in bt)
            {
                Console.WriteLine("{0}", b);
            }

            string decoding = ascii.GetString(bt);

        }

// PLC랑 I/F 많으니 이런건 기본적으로 알아두자... 아 그래도 헷갈려...ㅠ.ㅠ