using System;

using System.Text;

namespace DemoApplication {

   public class Program {

      static void Main(string[] args) {

          //Console.WriteLine(Convert.ToByte("32", 16));

          string input = "34705";//8000

            var bytes = HexToBytes(input);

            ushort us = 34705;//Crc16.ComputeChecksum(bytes);

                string hex = us.ToString("x2");

            Console.WriteLine($"{us} {hex} {string.Join("-", HexToBytes(hex))}"); //c061

        byte[] bt = new byte[7];

        bt[0] = 0x43;//C // ascii

        bt[1] = 0x4D;//M // ascii

        bt[2] = 0x30;//0 // ascii

        bt[3] = 0x30;//0 // ascii

        bt[4] = HexToBytes(hex)[0];//0x87;// CRC-16

        bt[5] = HexToBytes(hex)[1];//0x91;// CRC-16

        bt[6] = 0x0D;// CR - end of line

        string str2 = Encoding.ASCII.GetString(bt);

        Console.WriteLine($"String is: {str2}");

         /*

         byte[] byteArray = Encoding.ASCII.GetBytes("CM00__13");

         Console.WriteLine($"Byte Array is: {string.Join(" ", byteArray)}");

          byte[] byteArrayRes = Encoding.Default.GetBytes("RE0099|DATA");

         Console.WriteLine($"Byte Array Res is: {string.Join(" ", byteArrayRes)}");

         string str = Encoding.ASCII.GetString(byteArray);

         Console.WriteLine($"String is: {str}");

          byte[] bt = new byte[13];

          bt[0] =   255;

            bt[1] = 251;

            bt[2] = 1;

            bt[3] = 255;

            bt[4] = 251;

            bt[5] = 3;

            bt[6] = 255;

            bt[7] = 250;

            bt[8] = 44;

            bt[9] = 106;

            bt[10] =    96;

            bt[11] =    255;

            bt[12] =    240;

          string str2 = Encoding.ASCII.GetString(bt);

         Console.WriteLine($"String is: {str2}");

          */

         Console.ReadLine();

      }

       static byte[] HexToBytes(string input)

    {

        byte[] result = new byte[input.Length / 2];

        for(int i = 0; i < result.Length; i++)

        {

            result[i] = Convert.ToByte(input.Substring(2 * i, 2), 16);

        }

        return result;

    }

   }

    public static class Crc16

    {

        const ushort polynomial = 0xA001;

        static readonly ushort[] table = new ushort[256];

​

        public static ushort ComputeChecksum(byte[] bytes)

        {

            ushort crc = 0;

            for (int i = 0; i < bytes.Length; ++i)

            {

                byte index = (byte)(crc ^ bytes[i]);

                crc = (ushort)((crc >> 8) ^ table[index]);

            }

            return crc;

        }

​

        static Crc16()

        {

            ushort value;

            ushort temp;

            for (ushort i = 0; i < table.Length; ++i)

            {

                value = 0;

                temp = i;

                for (byte j = 0; j < 8; ++j)

                {

                    if (((value ^ temp) & 0x0001) != 0)

                    {

                        value = (ushort)((value >> 1) ^ polynomial);

                    }

                    else

                    {

                        value >>= 1;

                    }

                    temp >>= 1;

                }

                table[i] = value;

            }

        }

    }

}