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Message: [QUOTE="Guest, post: 7537715"] Hi, can I know how can I get the port settings at the point before sending out the data as the port is an IntPtr type? I checked the settings I sent out when I open the device: bool bReturn = CommAPI.SetupComm(hPort, rxBufferSize, txBufferSize); // transfer the port settings to a DCB structure dcb.BaudRate = (uint)portSettings.BasicSettings.BaudRate; dcb.ByteSize = portSettings.BasicSettings.ByteSize; dcb.EofChar = (sbyte)portSettings.EOFChar; dcb.ErrorChar = (sbyte)portSettings.ErrorChar; dcb.EvtChar = (sbyte)portSettings.EVTChar; dcb.fAbortOnError = portSettings.AbortOnError; dcb.fBinary = true; dcb.fDsrSensitivity = portSettings.DSRSensitive; dcb.fDtrControl = (DCB.DtrControlFlags)portSettings.DTRControl; dcb.fErrorChar = portSettings.ReplaceErrorChar; dcb.fInX = portSettings.InX; dcb.fNull = portSettings.DiscardNulls; dcb.fOutX = portSettings.OutX; dcb.fOutxCtsFlow = portSettings.OutCTS; dcb.fOutxDsrFlow = portSettings.OutDSR; dcb.fParity = (portSettings.BasicSettings.Parity == Parity.none) ? false : true; dcb.fRtsControl = (DCB.RtsControlFlags)portSettings.RTSControl; dcb.fTXContinueOnXoff = portSettings.TxContinueOnXOff; dcb.Parity = (byte)portSettings.BasicSettings.Parity; dcb.StopBits = (byte)portSettings.BasicSettings.StopBits; dcb.XoffChar = (sbyte)portSettings.XoffChar; dcb.XonChar = (sbyte)portSettings.XonChar; dcb.XonLim = dcb.XoffLim = (ushort)(rxBufferSize / 10); CommAPI.SetCommState(hPort, dcb); and I am sure the settings is correct because when I tested on HyperTerminal using the same setting, it works. Any idea? [/QUOTE]

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