Question

我在向串口发送字符串后对CRLF有疑问。让我解释一下我想做什么，在这里有一个例子。

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

这就是我想要做但我无法到达的地方，有人可以帮我这个。我想我必须做CRLF来开始换行，但如果你有其他建议，他们会更受欢迎这就是我所做的：

代码：

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

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

或者使用已经执行此操作的WriteLine方法。所以：

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

变为：

_comport.WriteLine(content);

Answer 2

您需要发送命令CR（回车）和LF（换行或换行）。

这只是发送你的命令加上CR和LF，如下所示：

string command = "myCommand";

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

\ r \ n = CR + LF - ＆gt;用作Windows中的换行符

串行通信和CRLF C＃

2 个答案: