做工业通信有很长时间了,特别是串口(232/485),有VB/VC/C各种版本的串口操作代码,这些代码也经过了多年的现场考验,应该说是比较健壮的代码,但是目前却没有C#相对成熟的串口操作代码,最近用Moxa的设备开发基于WinCE5.0的串口操作代码,所以就扩充完善了一下串口操作,特别是SendCommand函数,这是我比较常用的主从通信代码,不喜欢用事件或线程接数据,在规定的超时时间内直接循环判断要接收的数据。
下面是具体的代码:
public class PortData { public event PortDataReceivedEventHandle Received; public event SerialErrorReceivedEventHandler Error; public SerialPort port; public bool ReceiveEventFlag = false ; // 接收事件是否有效 false表示有效 public PortData( string sPortName, int baudrate,Parity parity,SerialInterface.SerialMode mode) { port = new SerialPort(sPortName, baudrate, parity, 8 , StopBits.One); port.RtsEnable = true ; port.ReadTimeout = 3000 ; port.DataReceived += new SerialDataReceivedEventHandler(DataReceived); port.ErrorReceived += new SerialErrorReceivedEventHandler(ErrorEvent); } ~ PortData() { Close(); } public void Open() { if ( ! port.IsOpen) { port.Open(); } } public void Close() { if (port.IsOpen) { port.Close(); } } // 数据发送 public void SendData( byte [] data) { if (port.IsOpen) { port.Write(data, 0 , data.Length); } } public void SendData( byte [] data, int offset, int count) { if (port.IsOpen) { port.Write(data, offset, count); } } // 发送命令 public int SendCommand( byte [] SendData, ref byte [] ReceiveData, int Overtime) { if (port.IsOpen) { ReceiveEventFlag = true ; // 关闭接收事件 port.DiscardInBuffer(); // 清空接收缓冲区 port.Write(SendData, 0 , SendData.Length); int num = 0 ,ret = 0 ; while (num ++ < Overtime) { if (port.BytesToRead >= ReceiveData.Length) break ; System.Threading.Thread.Sleep( 1 ); } if (port.BytesToRead >= ReceiveData.Length) ret = port.Read(ReceiveData, 0 , ReceiveData.Length); ReceiveEventFlag = false ; // 打开事件 return ret; } return - 1 ; } public void ErrorEvent( object sender, SerialErrorReceivedEventArgs e) { if (Error != null ) Error(sender, e); } // 数据接收 public void DataReceived( object sender, SerialDataReceivedEventArgs e) { // 禁止接收事件时直接退出 if (ReceiveEventFlag) return ; byte [] data = new byte [port.BytesToRead]; port.Read(data, 0 , data.Length); if (Received != null ) Received(sender, new PortDataReciveEventArgs(data)); } public bool IsOpen() { return port.IsOpen; } } public delegate void PortDataReceivedEventHandle( object sender, PortDataReciveEventArgs e); public class PortDataReciveEventArgs : EventArgs { public PortDataReciveEventArgs() { this .data = null ; } public PortDataReciveEventArgs( byte [] data) { this .data = data; } private byte [] data; public byte [] Data { get { return data; } set { data = value; } } }【附注】1~9 串口的名称是 "COMx:",>9的以前用.//COMx:比较好使,但是在moxa 661设备上却不行,要用如下格式"$device//COM" + PortNo.ToString() + "/0",也许这是moxa修改了相应的串口驱动。
叶帆工作室(csdn)相关连接:http://blog.csdn.net/yefanqiu/archive/2007/03/27/1543187.aspx