有没有谁用c#编过串口通讯的，给你例子看看

Question

有没有谁用c#编过串口通讯的，
要如何制定通讯协议，通讯数据包要如何校验还有要如何接收和发送数据。
给你例子看看
有的可以将代码发到

Answer 1

/****************************************************************** 
* Copyright(c)  : Tangxu 
* Description  : 
* CreateDate    : 2006-9-01 04:53:08 
* Creater      : Tang.xu 
* LastChangeDate: 
* LastChanger  : 
* Version Info  : 1.0.0 
* ******************************************************************/ 
using System; 
using System.IO.Ports; 
using System.Threading; 
using System.Text; namespace Tangxu.Common 
{ 
    public class ReadCom 
    { 
        public ReadCom() 
        { 
            _ReadConfig = new ReadConfigure(System.Environment.CurrentDirectory + "\\Com_Info.xml"); 
        }         public ReadCom(string sCom,int nBaud):this() 
        { 
        
        }         private byte[] _ReadBuffer; 
        private SerialPort ss_port = new SerialPort(); 
        private static int nReadCount = 0; 
        private ReadConfigure _ReadConfig;         #region Initialize com port         public bool InitCom()//初始化建串口类实例 
        { 
          // return true; 
            try 
            { 
                ss_port.PortName = _ReadConfig.GetNodeValue("PORT");// _sComPort; 
                ss_port.BaudRate = int.Parse(_ReadConfig.GetNodeValue("BAUD"));//_nBaud; 
                ss_port.ReadBufferSize = 10240; 
                ss_port.DataBits = int.Parse(_ReadConfig.GetNodeValue("DATA"));//8; 
                switch (_ReadConfig.GetNodeValue("PARITY")) 
                { 
                    case "None": 
                        ss_port.Parity = Parity.None; 
                        break; 
                    case "Even": 
                        ss_port.Parity = Parity.Even; 
                        break; 
                    case "Mark": 
                        ss_port.Parity = Parity.Mark; 
                        break; 
                    case "Odd": 
                        ss_port.Parity = Parity.Odd; 
                        break; 
                    case "Space": 
                        ss_port.Parity = Parity.Mark; 
                        break; 
                } 
                switch (_ReadConfig.GetNodeValue("STOP")) 
                { 
                    case "1": 
                        ss_port.StopBits = StopBits.One; 
                        break; 
                    case "1.5": 
                        ss_port.StopBits = StopBits.OnePointFive; 
                        break; 
                    case "2": 
                        ss_port.StopBits = StopBits.Two; 
                        break; 
                } 
                ss_port.ReadTimeout = 600; 
                ss_port.WriteTimeout = 700;                 ss_port.Open();//打开串口 
                return true; 
            } 
            catch (Exception ex) 
            { 
                throw new Exception("打开串口失败!\r\n错误信息:" + ex.Message); 
            } 
        } 
        #endregion         #region FreeDrv 
        /// <summary> 
        /// free opw 
        /// </summary> 
        public void FreeDrv() 
        { 
            try 
            { 
                if (ss_port != null) 
                {                  
                    ss_port.Close();  
                } 
            } 
            catch 
            { } 
        } 
        #endregion         #region Write command to OPW 
        /// <summary> 
        /// 发操作命令给OPW设备 
        /// 并返回状态 
        /// </summary> 
        /// <param name="sCommand"> </param> 
        /// <returns> </returns> 
        public string WriteCommand(string sCommand) 
        { 
            StringBuilder sb = new StringBuilder(); 
            bool bRead = true; 
            try 
            { 
                ss_port.DiscardInBuffer(); 
                ss_port.Write(sCommand); 
                Thread.Sleep(1500); 
                while (bRead) 
                { 
                    _ReadBuffer = new byte[ss_port.BytesToRead]; 
                    ss_port.Read(_ReadBuffer, 0, _ReadBuffer.Length); 
                    sb.Append(Encoding.ASCII.GetString(_ReadBuffer)); 
                    Thread.Sleep(500); 
                    if (ss_port.BytesToRead <= 0) 
                    { 
                        bRead= false; 
                    } 
                } 
                if (sb.ToString().Length== 0) 
                { 
                    nReadCount++; 
                }                 if (nReadCount == 3) 
                { 
                    nReadCount = 0; 
                    throw new Exception("设置不正确或没有联接设备!"); 
                }              
            } 
            catch (Exception ex) 
            { 
                throw new Exception("从设备获取数据失败!\r\n错误信息:" + ex.Message); 
            } 
            return sb.ToString(); ; 
        }         public string WriteCommand(byte[] bCommand) 
        { 
            StringBuilder sb = new StringBuilder(); 
            bool bRead = true; 
            try 
            { 
                ss_port.DiscardInBuffer(); 
                ss_port.Write(bCommand,0,bCommand.Length); 
                Thread.Sleep(1500); 
                while (bRead) 
                { 
                    _ReadBuffer = new byte[ss_port.BytesToRead]; 
                    ss_port.Read(_ReadBuffer, 0, _ReadBuffer.Length); 
                    sb.Append(Encoding.ASCII.GetString(_ReadBuffer)); 
                    Thread.Sleep(500); 
                    if (ss_port.BytesToRead <= 0) 
                    { 
                        bRead = false; 
                    } 
                } 
                if (sb.ToString().Length == 0) 
                { 
                    nReadCount++; 
                }                 if (nReadCount == 3) 
                { 
                    nReadCount = 0; 
                    throw new Exception("设置不正确或没有联接设备!"); 
                }              
            } 
            catch (Exception ex) 
            { 
                throw new Exception("从设备获取数据失败!\r\n错误信息:" + ex.Message); 
            } 
            return sb.ToString(); 
        } 
        #endregion         #region Get All COM Port 
        public string[] GetAllComPort() 
        { 
            string[] sAllPort = null; 
            try 
            { 
                sAllPort = SerialPort.GetPortNames(); 
            } 
            catch (Exception ex) 
            { 
                throw new Exception("获取计算机COM口列表失败!\r\n错误信息:" + ex.Message); 
            } 
            return sAllPort; 
        } 
        #endregion 
    } }