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POError opening serial port
 

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    <p>I'm trying to open and read from a serial port using the System.IO.Ports.SerialPort class. I dragged the serial port from the tool pane (VS 2008) on to my windows form. I've got a property grid set up so I can easily change properties of the serial port at runtime. When I try to open the port, I get the error shown below. I don't understand why because I can open and read from the port using Hyperterminal. Any ideas?</p> <pre><code>System.IO.IOException Error connection: A device attached to the system is not functioning at System.IO.Ports.InternalResources.WinIOError(Int32 errorCode, String str) at System.IO.Ports.InternalResources.WinIOError() at System.IO.Ports.SerialStream.set_DtrEnable(Boolean value) at System.IO.Ports.SerialStream..ctor(String portName, Int32 baudRate, Parity parity, Int32 dataBits, StopBits stopBits, Int32 readTimeout, Int32 writeTimeout, Handshake handshake, Boolean dtrEnable, Boolean rtsEnable, Boolean discardNull, Byte parityReplace) at System.IO.Ports.SerialPort.Open() at Test.CardReader.frmMain.Connect() in D:\Develop\2.0\Projects\Kiosk\EmbeddedBrowser\Windows Forms\Test.CardReader\Form1.cs:line 166 </code></pre> <p>Note, this is a USB connection so it's actuall a virtual serial port My settings are as follows:<br/> BaudRate = 9600 <br/> DataBits = 8 <br/> DiscardNull = false <br/> DtrEnable = false <br/> Handshake = None <br/> Parity = None <br/> ParityReplace = 63 <br/> PortName = COM3 <br/> ReadBufferSize = 4096 <br/> ReadTimeout = -1 <br/> ReceivedBytes = 1 <br/> TrsEnable = False <br/> StopBits = One <br/> WriteBufferSize = 2048 <br/> WriteTimeout = -1<br/></p> <p>I downloaded PortMon from sysinternals. I've captured 2 logs, the first is the log how what happens when Hyperterminal opens the port, the second is what happends when The .net SerialPort class tries to open the port:</p> <p>Hyperterminal:</p> <pre><code>IRP_MJ_CREATE USBSER000 SUCCESS Options: Open IOCTL_SERIAL_SET_QUEUE_SIZE USBSER000 SUCCESS InSize: 8192 OutSize: 8192 IOCTL_SERIAL_CONFIG_SIZE USBSER000 SUCCESS Size: 0 IOCTL_SERIAL_GET_BAUD_RATE USBSER000 SUCCESS IOCTL_SERIAL_GET_LINE_CONTROL USBSER000 SUCCESS IOCTL_SERIAL_GET_CHARS USBSER000 SUCCESS IOCTL_SERIAL_GET_HANDFLOW USBSER000 SUCCESS IOCTL_SERIAL_GET_BAUD_RATE USBSER000 SUCCESS IOCTL_SERIAL_GET_LINE_CONTROL USBSER000 SUCCESS IOCTL_SERIAL_GET_CHARS USBSER000 SUCCESS IOCTL_SERIAL_GET_HANDFLOW USBSER000 SUCCESS IOCTL_SERIAL_SET_BAUD_RATE USBSER000 SUCCESS Rate: 9600 IOCTL_SERIAL_SET_RTS USBSER000 SUCCESS IOCTL_SERIAL_SET_DTR USBSER000 * 0xC0000001 IOCTL_SERIAL_SET_LINE_CONTROL USBSER000 SUCCESS StopBits: 1 Parity: NONE WordLength: 8 IOCTL_SERIAL_SET_CHAR USBSER000 SUCCESS EOF:1a ERR:0 BRK:0 EVT:1a XON:f6 XOFF:6 IOCTL_SERIAL_SET_HANDFLOW USBSER000 SUCCESS Shake:80000001 Replace:80000040 XonLimit:80 XoffLimit:200 IOCTL_SERIAL_SET_TIMEOUTS USBSER000 SUCCESS RI:10 RM:0 RC:0 WM:0 WC:5000 IOCTL_SERIAL_SET_WAIT_MASK USBSER000 SUCCESS Mask: RLSD ERR IOCTL_SERIAL_GET_MODEMSTATUS USBSER000 SUCCESS IOCTL_SERIAL_WAIT_ON_MASK USBSER000 IRP_MJ_READ USBSER000 Length 80 </code></pre> <p>.Net SerialPort:</p> <pre><code>IRP_MJ_CREATE USBSER000 SUCCESS Options: Open IOCTL_SERIAL_GET_PROPERTIES USBSER000 SUCCESS IOCTL_SERIAL_GET_MODEMSTATUS USBSER000 SUCCESS IOCTL_SERIAL_GET_BAUD_RATE USBSER000 SUCCESS IOCTL_SERIAL_GET_LINE_CONTROL USBSER000 SUCCESS IOCTL_SERIAL_GET_CHARS USBSER000 SUCCESS IOCTL_SERIAL_GET_HANDFLOW USBSER000 SUCCESS IOCTL_SERIAL_GET_BAUD_RATE USBSER000 SUCCESS IOCTL_SERIAL_GET_LINE_CONTROL USBSER000 SUCCESS IOCTL_SERIAL_GET_CHARS USBSER000 SUCCESS IOCTL_SERIAL_GET_HANDFLOW USBSER000 SUCCESS IOCTL_SERIAL_SET_BAUD_RATE USBSER000 SUCCESS Rate: 9600 IOCTL_SERIAL_CLR_RTS USBSER000 SUCCESS IOCTL_SERIAL_CLR_DTR USBSER000 * 0xC0000001 IOCTL_SERIAL_SET_LINE_CONTROL USBSER000 SUCCESS StopBits: 1 Parity: NONE WordLength: 8 IOCTL_SERIAL_SET_CHAR USBSER000 SUCCESS EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13 IOCTL_SERIAL_SET_HANDFLOW USBSER000 SUCCESS Shake:0 Replace:0 XonLimit:4096 XoffLimit:4096 IOCTL_SERIAL_GET_BAUD_RATE USBSER000 SUCCESS IOCTL_SERIAL_GET_LINE_CONTROL USBSER000 SUCCESS IOCTL_SERIAL_GET_CHARS USBSER000 SUCCESS IOCTL_SERIAL_GET_HANDFLOW USBSER000 SUCCESS IOCTL_SERIAL_SET_BAUD_RATE USBSER000 SUCCESS Rate: 9600 IOCTL_SERIAL_CLR_RTS USBSER000 SUCCESS IOCTL_SERIAL_CLR_DTR USBSER000 * 0xC0000001 IOCTL_SERIAL_SET_LINE_CONTROL USBSER000 SUCCESS StopBits: 1 Parity: NONE WordLength: 8 IOCTL_SERIAL_SET_CHAR USBSER000 SUCCESS EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13 IOCTL_SERIAL_SET_HANDFLOW USBSER000 SUCCESS Shake:0 Replace:0 XonLimit:4096 XoffLimit:4096 IOCTL_SERIAL_CLR_DTR USBSER000 * 0xC0000001 IRP_MJ_CLEANUP USBSER000 SUCCESS IRP_MJ_CLOSE USBSER000 SUCCESS </code></pre>
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    1. CODoes the InnerException of the IOException have any more details? Also, can you open this in HyperTerminal (or another terminal)?
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    2. CO@Jon B, There is no inner exception in this error, and it does work in hyperterminal.
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    3. COIn the Win32 API, DTR is controlled by one of the flags in the `DCB` structure: http://msdn.microsoft.com/en-us/library/aa363436(VS.85).aspx
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