Serial communication and CRLF C#

Question

i Have question about CRLF after sending a string to the serial port. Let me explain what im trying to do, Under here there is an example.

[ACR]  CRLF
10:90  CRLF
11:20  CRLF
12:2.1 CRLF

That is what im trying to do but i cant get anywhere, Can someone help me with this. i think i have to do the CRLF to start a newline but if you have other suggestions they will be more then welcome This is what i've done:

Code:

private void SendMessageTest()
        {
            var content = _durCleaningTextbox.Text;

            byte[] array = ComPort.StringToBytes(content);




                _comport.WriteBytes(array);
                _comport.ReadBytes(array, array.Length, 1000);
                string result = Encoding.ASCII.GetString(array);
            MessageBox.Show(result);
        }

---

using System;
using System.IO;
using System.Text;
using System.IO.Ports;

namespace Communication
{
    public class ComPort
    {
        private readonly SerialPort _serialPort;

        public ComPort(string portName, int baudRate)
        {
            _serialPort = new SerialPort();

            _serialPort.PortName = portName;
            _serialPort.BaudRate = baudRate;

            _serialPort.StopBits = StopBits.One;
            _serialPort.DataBits = 8;
            _serialPort.Parity = Parity.None;

            _serialPort.Handshake = Handshake.None;


            // _serialPort.WriteBufferSize = 1;
            _serialPort.DtrEnable = true;
            _serialPort.RtsEnable = true;

            _serialPort.Open();

            _serialPort.ReadTimeout = 20000;
            _serialPort.WriteTimeout = 20000;
        }

        public void Clear()
        {
            while (ReadByte() != -1)
                continue;
        }

        private byte[] _array = new byte[] {0};

        public void WriteByte(byte value)
        {
            _array[0] = value;
            _serialPort.Write(_array, 0, 1);
            // _serialPort.BaseStream.WriteByte(value);
            _serialPort.BaseStream.Flush();
        }

        public void WriteBytes(byte[] array)
        {
            _serialPort.Write(array, 0, array.Length);
        }

        public void WriteBytes(byte[] array, int index, int length )
        {
            _serialPort.Write(array, index, length);
        }

        private int _readTimeOut = -1;

        public int ReadByte(int timeOut = 200)
        {
            if (timeOut != _readTimeOut)
                _serialPort.ReadTimeout = _readTimeOut = timeOut;
            try
            {
                //return _serialPort.BaseStream.ReadByte();
                return _serialPort.ReadByte();
                // _serialPort.Read(array, 0, 1);
                // return array[0];
            }
            catch (TimeoutException)
            {
                return -1;
            }
        }

        public int ReadBytes(byte[] array, int length, int timeOut = 200)
        {
            if (timeOut != _readTimeOut)
                _serialPort.ReadTimeout = _readTimeOut = timeOut;
            try
            {
                //return _serialPort.BaseStream.ReadByte();

                int bytesRead = 0;
                while ( bytesRead < length )
                    bytesRead += _serialPort.Read(array, bytesRead, length - bytesRead);

                // _serialPort.Read(array, 0, 1);
                // return array[0];
                return bytesRead;
            }
            catch (TimeoutException)
            {
                return -1;
            }
        }

        /// <summary>
        /// sends string followed by CR - LF
        /// </summary>
        /// <param name="line"></param>
        public void WriteLine(String line)
        {
            WriteBytes(StringToBytes(line + "\r\n"));
        }

        public static byte[] StringToBytes(string input)
        {
            return Encoding.ASCII.GetBytes(input);
        }

        public void Close()
        {
            try
            {
                _serialPort.DtrEnable = false;
                _serialPort.RtsEnable = false;
                _serialPort.Close();
            }
            catch(IOException)
            {

            }
        }

        public bool Dtr
        {
            get { return _serialPort.DtrEnable; }
            set { _serialPort.DtrEnable = value; }
        }

        public bool Rts
        {
            get { return _serialPort.RtsEnable; }
            set { _serialPort.RtsEnable = value; }
        }
    }
}

Answer 1

You need send the commands CR (Carriage Return) and LF (Line Feed, or new line).

For this is just to send your command plus the the CR and LF like this:

string command = "myCommand";

port.write(string.format("{0}\r\n", command));

\r\n = CR + LF -> Used as a new line character in Windows

Answer 2

byte[] array = ComPort.StringToBytes(content + "\r\n");

Or use your WriteLine method which already does this. So:

byte[] array = ComPort.StringToBytes(content);
_comport.WriteBytes(array);

Becomes:

_comport.WriteLine(content);