关于检测com串口通讯是否正常

Question

问题的描述是这样的:我写了一个程序，但是缺少一个模块，就是用来检测com串口通讯是否正常工作的，而且这个检测一定要在程序运行的过程中，不断的检测。

Answer 1

我以前写了一个读写串的程序 ,我是在读或是写的时候检查串口是否能正常通信的,其它不用专门检测的!
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!");
                }           
如果发了命令后,连续三次读不到数据的话程序就认为是通信失败的!     
   #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

Answer 2

如果你用的是C#下的SerialPort控件的话，在发送数据前判断一下serialPort1.CtsHolding属性时候可有发送就可以了。