// This function checks to see if the port is a modem, by sending
// an AT command to the port. if the port responds, it is assumed to
// be a modem. The function returns a bool.
private bool IsPortAModem(int port)
{
// Always wrap up working with Comm Ports in exception handlers.
try
{
// Attempt to open the port.
m_CommPort.Open(port, 115200, 8, Rs232.DataParity.Parity_None, Rs232.DataStopBit.StopBit_1, 4096);
// Write an AT Command to the Port.
m_CommPort.Write(Encoding.ASCII.GetBytes("AT" + "\n"));
// Sleep long enough for the modem to respond.
System.Threading.Thread.Sleep(200);
Application.DoEvents();
// try { to get info from the Comm Port.
try
{
Byte b;
// try { to read a single byte. if you get it, then assume
// that the port contains a modem. Clear the buffer before
// leaving.
m_CommPort.Read(1);
m_CommPort.ClearInputBuffer();
m_CommPort.Close();
return(true);
}
catch (Exception exc)
{
// null to read from the Comm Port, so set to false
m_CommPort.Close();
return(false);
}
}
catch (Exception exc)
{
// Port could not be opened or written to.
this.clstPorts.SetItemChecked(port - 1, false);
MessageBox.Show("Could not open port.", this.Text);
return(false);
}
}
private void _RS232_DataReceived(Rs232 Source, byte[] DataBuffer)
{
mScannerTimeout.Stop();
//接受到了数据
//校验数据
if (DataBuffer.Length != 5)
{
Source.ClearInputBuffer();
StartNextCheckInformationRequest();
return;
}
byte[] ReceiveData = DataBuffer;
//Special CheckSum校验
int CheckSumFlag = 0;
for (int i = 1; i <= ReceiveData.Length - 2; i++)
{
CheckSumFlag += ReceiveData[i];
}
if ((byte)(CheckSumFlag % 256) != ReceiveData[ReceiveData.Length - 1])
{
StartNextCheckInformationRequest(); return;
}
;
if ((256 - (mCurrentRoom.Number + mCurrentRoom.MyFloor.Number) % 256) != ReceiveData[0])
{
StartNextCheckInformationRequest(); return;
}
;
if (mCurrentReceiveDataCheckRepeatTimes == 0)
{
mReceiveCheckData = ReceiveData;
}
else
{
//判断是不是与前几次相同
if (!Utility.ArrayDataEquals(mReceiveCheckData, ReceiveData))
{
StartNextCheckInformationRequest(); return;
}
;
}
//下一步
mCurrentReceiveDataCheckRepeatTimes++;
if (mCurrentReceiveDataCheckRepeatTimes >= mReceiveDataCheckRepeatTimes)
{
//数据都正确
ApplyData();
//判断是否断网
if (mDisconnectList[mCurrentRoom.ToString()] != null)
{
mDisconnectList.Remove(mCurrentRoom.ToString());
}
mCurrentRoom.MyATM.Connect();
//延时一段时间再查询下一个房间
mScanNextRoomDelay.Start();
}
else
{
//下一次校验查询
mScannerTimeout.Start();
SendRequestRoomInformationData();
}
}