最近因项目需求，对扫描枪和红外串口之间的通信深入的研究了一下，下面我简单说一下研发心得，供一些从来没接触过这方面开发的人员参考：
代码以C# winform为例. 供需要的人员使用。
1）红外串口通信：
首先电脑需要配置红外头及线，电脑会自动识别出对应的串口号，然后将对应的串口号和软件配置结合在一起。
/// <summary>
/// 初始化参数及串口
/// </summary>
private void initRedPortParm()
{
serialPort = new SerialPort();
serialPort.BaudRate = meterConfig.baudRate;
serialPort.PortName = meterConfig.comName;
serialPort.ReceivedBytesThreshold = 1;
serialPort.DataReceived += new
SerialDataReceivedEventHandler(Com_DataReceived);
if (serialPort.IsOpen == false)
serialPort.Open();
}/// <summary>
/// 红外串口接收数据
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Com_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
try
{
byte[] bufByte = receiveFromSerialPort(serialPort, 500);
if (bufByte != null && bufByte.Length > 0)
{
buf = bufByte;
LogWriter.WriteLog("接收串口数据："+buf);
}
}
catch (Exception ex)
{
lblStatus.Text = "红外串口接收数据异常";
LogWriter.WriteLog(ex.Message);
}
}
/// <summary>
/// 接收串口数据
/// </summary>
/// <param name="serialPort">串口</param>
/// <param name="iSleepTime">暂停时长（毫秒）</param>
/// <returns></returns>
private byte[] receiveFromSerialPort(SerialPort serialPort, int iSleepTime)
{
byte[] buffer;
int iCount;
iCount = 0;
try
{
Thread.Sleep(iSleepTime);
iCount = serialPort.BytesToRead;
buffer = new byte[iCount];
serialPort.Read(buffer, 0, iCount);
//丢弃来自串行驱动程序的接受缓冲区的数据
serialPort.DiscardInBuffer();
return buffer;
}
catch (Exception exp)
{
lblStatus.Text = "红外接收数据异常";
LogWriter.WriteLog(exp.Message);
throw;
}
}/// <summary>
/// 通过红外串口发送数据
/// </summary>
/// <param name="data">数据</param>
/// <returns></returns>
private bool SendData(byte[] data)
{
if (serialPort.IsOpen)
{
try
{
serialPort.Write(data, 0, data.Length);//发送数据
LogWriter.WriteLog("串口发送数据："+data);
return true;
}
catch (Exception ex1)
{
LogWriter.WriteLog(ex1.Message);
lblStatus.Text = "红外连接已断开";
}
}
else
{
lblStatus.Text = "串口未打开";
}
return false;
}
2）扫描枪串口通信：
扫描枪分为串口扫描枪和USB扫描枪。在开发中他们对应的实现代码是不同的，如：
- USB扫描枪代码接收事件：
private void meterCodeBox_TextChanged(object sender, EventArgs e)
{
try
{
//文本框接收值
string s = meterCodeBox.Text.Trim();
//判断接收的长度，如果扫描枪设置了Enter自动换行时会有换行字符，长度会多2位。
if ((s.Length == 17 || s.Length == 18 || s.Length == 29 || s.Length == 30) && s.Substring(s.Length - 2) == "\r\n")
{
Logger.WriteLog(s + "字符串长度：" + s.Length);
int iIndex = add(meterCodeBox.Text.Trim());
if (iIndex != -1)
{
startCheck(iIndex);
}
}
//如果扫描枪没有设置Enter自动换行，则接收的值为正常。
else if (s.Length == 15 || s.Length == 28)
{
Logger.WriteLog(s + "字符串长度：" + s.Length);
int iIndex = add(meterCodeBox.Text.Trim());
if (iIndex != -1)
{
startCheck(iIndex);
}
}
}
catch (Exception exp)
{
MessageBox.Show("错误！" + System.Environment.NewLine + "错误信息：" + exp.Message, "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}- 串口扫描枪处理方法：
private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
try
{
SerialPort serp = (SerialPort)sender;
try
{
Thread.Sleep(200); //（毫秒）等待一定时间，确保数据的完整性 int len
int len = serp.BytesToRead;
if (len != 0)
{
meterCodeBox.Invoke(new EventHandler(delegate
{
int iIndex = add(serp.ReadExisting());
if (iIndex != -1)
{
startCheck(iIndex);
}
}));
}
//丢弃来自串行驱动程序的接受缓冲区的数据
serp.DiscardInBuffer();
}
catch (Exception exp)
{
MessageBox.Show("错误：" + exp.Message, "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
catch (Exception exp)
{
MessageBox.Show("错误！" + System.Environment.NewLine + "错误信息：" + exp.Message, "系统消息", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}
注意：本文归作者所有，未经作者允许，不得转载
