C#串口操作的使用浅析

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。