C#串口操作的使用: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C#串口操作代码,所以就扩充完善了一下C#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C#串口操作的代码:
- 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();
- }
- }
- //C#串口操作之数据发送
- 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);
- }
- }
- //C#串口操作之发送命令
- 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);
- }
- //C#串口操作之数据接收
- 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; }
- }
- }
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。
C#串口操作的一些内容就向你介绍到这里,希望对你了解和学习使用C#串口操作有所帮助。
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