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Thread: qextserialport problem

  1. 18th May 2010, 17:17 #1
    cae
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    Default qextserialport problem

    Hi, i'm trying to send orders to a controler by RS232 using Qextserialport, but it doesnt seem to work well...

    Controler comunication channel:
    RS232, 9600 baud, No parity, 8 bits, 1 stop bit, monodirectional

    and what i do its this:

    Qt Code: 
    1. PortSettings portSet;
    2.  
    3.      portSet.BaudRate=BAUD9600;
    4.      portSet.DataBits=DATA_8;
    5.      portSet.Parity=PAR_NONE;
    6.  
    7.      portSet.StopBits=STOP_1;
    8.      portSet.FlowControl=FLOW_OFF;
    9.      portSet.Timeout_Millisec=0;
    10.      serial=new QextSerialPort("COM6",portSet);
    11.  
    12.      if(serial->open(QextSerialPort::WriteOnly))
    13.      {
    15.          msg.setText("good");
    16.          msg.exec();
    17.  
    18.      }
    19.      else
    20.      {
    22.          msg.setText("bad");
    23.          msg.exec();
    24.      }
    25.  
    26.      QTime dieTime;
    27.  
    28.      QString mesage(QString("CHR$(254);"));
    29.      serial->write(mesage.toAscii());
    30.  
    31.              dieTime=QTime::currentTime().addMSecs(10);
    32.              while(QTime::currentTime()<dieTime)
    33.                  QCoreApplication::processEvents(QEventLoop::AllEvents,100);
    34.  
    35.      QString mesage2("CHR$(19);");
    36.      serial->write(mesage2.toAscii());
    37.  
    38.              dieTime=QTime::currentTime().addMSecs(10);
    39.              while(QTime::currentTime()<dieTime)
    40.                  QCoreApplication::processEvents(QEventLoop::AllEvents,100);
    41.  
    42.  
    43.      QString mesage3("CHR$(3);");
    44.      serial->write(mesage3.toAscii());
    45.  
    46.              dieTime=QTime::currentTime().addMSecs(1000);
    47.              while(QTime::currentTime()<dieTime)
    48.                  QCoreApplication::processEvents(QEventLoop::AllEvents,100);
    49.  
    50.      QString mesage4(QString("CHR$(254);"));
    51.      serial->write(mesage4.toAscii());
    52.  
    53.              dieTime=QTime::currentTime().addMSecs(10);
    54.              while(QTime::currentTime()<dieTime)
    55.                  QCoreApplication::processEvents(QEventLoop::AllEvents,100);
    56.  
    57.      QString mesage5("CHR$(25);");
    58.      serial->write(mesage5.toAscii());
    59.  
    60.  
    61.              dieTime=QTime::currentTime().addMSecs(10);
    62.              while(QTime::currentTime()<dieTime)
    63.                  QCoreApplication::processEvents(QEventLoop::AllEvents,100);
    64.  
    65.      QString mesage6("CHR$(0);");
    66.      serial->write(mesage6.toAscii());
    67.  
    68.      serial->close();
    To copy to clipboard, switch view to plain text mode 

    Basicly I send each order with a little delay (recomended by the protocol). The conexion seems to be set correctly because i read the good message, but afterwards the rest of orders dont seem to work.
    How can i know if the error is that nothing is being sended?
    is there any portSet wrong??

    I know the controler works because i have another application able to control it (but i dont have the code).

    thank you !!!



    by the way... i use Win XP
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  2. 18th May 2010, 18:42 #2
    squidge
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    Default Re: qextserialport problem

    To debug serial port communications, try Portmon from Sysinternals/Microsoft.

    Also, you should use a QTimer and state machine rather than your current method. It would be much cleaner, more readable and more reliable.

    What protocol are you using? Sending text such as "CHR$(0)" seems strange to me.
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  3. 19th May 2010, 09:21 #3
    cae
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    Default Re: qextserialport problem

    Hi, i've been comparing the output for my app, and the one that works for the connection.

    Here the working output:
    Qt Code: 
    1. 0	10:03:04	SerialControl.e	IRP_MJ_CREATE			Options: Open 		
    2. 11	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_BAUD_RATE			Rate: 9600	
    3. 12	10:03:04	SerialControl.e	IOCTL_SERIAL_CLR_RTS				
    4. 13	10:03:04	SerialControl.e	IOCTL_SERIAL_CLR_DTR				
    5. 14	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_LINE_CONTROL			StopBits: 1 Parity: NONE WordLength: 8	
    6. 15	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_CHAR			EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13	
    7. 16	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_HANDFLOW			Shake:0 Replace:0 XonLimit:1024 XoffLimit:1024	
    8. 17	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_BAUD_RATE				
    9. 18	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_LINE_CONTROL				
    10. 19	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_CHARS				
    11. 20	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_HANDFLOW				
    12. 21	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_BAUD_RATE			Rate: 9600	
    13. 22	10:03:04	SerialControl.e	IOCTL_SERIAL_CLR_RTS				
    14. 23	10:03:04	SerialControl.e	IOCTL_SERIAL_CLR_DTR				
    15. 24	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_LINE_CONTROL			StopBits: 1 Parity: NONE WordLength: 8	
    16. 25	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_CHAR			EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13	
    17. 26	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_HANDFLOW			Shake:0 Replace:0 XonLimit:1024 XoffLimit:1024	
    18. 27	10:03:04	SerialControl.e	IOCTL_SERIAL_CLR_DTR				
    19. 28	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_TIMEOUTS			RI:-1 RM:-1 RC:-2 WM:0 WC:0	
    20. 29	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_WAIT_MASK			Mask: RXCHAR RXFLAG CTS DSR RLSD BRK ERR RING 	
    21. 30	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_QUEUE_SIZE			InSize: 4096 OutSize: 2048	
    22. 31	10:03:04	SerialControl.e	IOCTL_SERIAL_WAIT_ON_MASK				
    23. 32	10:03:04	SerialControl.e	IRP_MJ_FLUSH_BUFFERS				
    24. 33	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_WAIT_MASK			Mask: 	
    25. 34	10:03:04	SerialControl.e	IOCTL_SERIAL_CLR_DTR				
    26. 35	10:03:04	SerialControl.e	IRP_MJ_FLUSH_BUFFERS				
    27. 36	10:03:04	SerialControl.e	IOCTL_SERIAL_PURGE			Purge: RXABORT RXCLEAR	
    28. 37	10:03:04	SerialControl.e	IOCTL_SERIAL_PURGE			Purge: TXABORT TXCLEAR 	
    29. 38	10:03:04	SerialControl.e	IRP_MJ_CLEANUP				
    30. 39	10:03:04	SerialControl.e	IRP_MJ_CLOSE				
    31. 40	10:03:04	SerialControl.e	IRP_MJ_CREATE			Options: Open 	
    32. 41	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_PROPERTIES				
    33. 42	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_MODEMSTATUS				
    34. 43	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_BAUD_RATE				
    35. 44	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_LINE_CONTROL				
    36. 45	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_CHARS				
    37. 46	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_HANDFLOW				
    38. 47	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_BAUD_RATE				
    39. 48	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_LINE_CONTROL				
    40. 49	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_CHARS				
    41. 50	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_HANDFLOW				
    42. 51	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_BAUD_RATE			Rate: 9600	
    43. 52	10:03:04	SerialControl.e	IOCTL_SERIAL_CLR_RTS				
    44. 53	10:03:04	SerialControl.e	IOCTL_SERIAL_CLR_DTR				
    45. 54	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_LINE_CONTROL			StopBits: 1 Parity: NONE WordLength: 8	
    46. 55	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_CHAR			EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13	
    47. 56	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_HANDFLOW			Shake:0 Replace:0 XonLimit:1024 XoffLimit:1024	
    48. 57	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_BAUD_RATE				
    49. 58	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_LINE_CONTROL				
    50. 59	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_CHARS				
    51. 60	10:03:04	SerialControl.e	IOCTL_SERIAL_GET_HANDFLOW				
    52. 61	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_BAUD_RATE			Rate: 9600	
    53. 62	10:03:04	SerialControl.e	IOCTL_SERIAL_CLR_RTS				
    54. 63	10:03:04	SerialControl.e	IOCTL_SERIAL_CLR_DTR				
    55. 64	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_LINE_CONTROL			StopBits: 1 Parity: NONE WordLength: 8	
    56. 65	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_CHAR			EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13	
    57. 66	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_HANDFLOW			Shake:0 Replace:0 XonLimit:1024 XoffLimit:1024	
    58. 67	10:03:04	SerialControl.e	IOCTL_SERIAL_CLR_DTR				
    59. 68	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_TIMEOUTS			RI:-1 RM:-1 RC:-2 WM:0 WC:0	
    60. 69	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_WAIT_MASK			Mask: RXCHAR RXFLAG CTS DSR RLSD BRK ERR RING 	
    61. 70	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_QUEUE_SIZE			InSize: 4096 OutSize: 2048
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    And now my output:
    Qt Code: 
    1. 0	10:04:20	ImageComposer.e	IRP_MJ_CREATE			Options: Open 	
    2. 1	10:04:20	ImageComposer.e	IOCTL_SERIAL_CONFIG_SIZE			Size: 0	
    3. 14	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_BAUD_RATE			Rate: 9600	
    4. 15	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_RTS				
    5. 16	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_DTR				
    6. 17	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_LINE_CONTROL			StopBits: 1 Parity: NONE WordLength: 8	
    7. 18	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_CHAR			EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13	
    8. 19	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_HANDFLOW			Shake:0 Replace:0 XonLimit:2048 XoffLimit:512	
    9. 20	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_BAUD_RATE				
    10. 21	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_LINE_CONTROL				
    11. 22	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_CHARS				
    12. 23	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_HANDFLOW				
    13. 24	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_BAUD_RATE			Rate: 9600	
    14. 25	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_RTS				
    15. 26	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_DTR				
    16. 27	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_LINE_CONTROL			StopBits: 1 Parity: NONE WordLength: 8	
    17. 28	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_CHAR			EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13	
    18. 29	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_HANDFLOW			Shake:0 Replace:0 XonLimit:2048 XoffLimit:512	
    19. 30	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_BAUD_RATE				
    20. 31	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_LINE_CONTROL				
    21. 32	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_CHARS				
    22. 33	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_HANDFLOW				
    23. 34	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_BAUD_RATE			Rate: 9600	
    24. 35	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_RTS				
    25. 36	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_DTR				
    26. 37	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_LINE_CONTROL			StopBits: 1 Parity: NONE WordLength: 8	
    27. 38	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_CHAR			EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13	
    28. 39	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_HANDFLOW			Shake:0 Replace:0 XonLimit:2048 XoffLimit:512	
    29. 40	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_BAUD_RATE				
    30. 41	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_LINE_CONTROL				
    31. 42	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_CHARS				
    32. 43	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_HANDFLOW				
    33. 44	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_BAUD_RATE			Rate: 9600	
    34. 45	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_RTS				
    35. 46	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_DTR				
    36. 47	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_LINE_CONTROL			StopBits: 1 Parity: NONE WordLength: 8	
    37. 48	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_CHAR			EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13	
    38. 49	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_HANDFLOW			Shake:0 Replace:0 XonLimit:2048 XoffLimit:512	
    39. 50	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_BAUD_RATE				
    40. 51	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_LINE_CONTROL				
    41. 52	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_CHARS				
    42. 53	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_HANDFLOW				
    43. 54	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_BAUD_RATE			Rate: 9600	
    44. 55	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_RTS				
    45. 56	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_DTR				
    46. 57	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_LINE_CONTROL			StopBits: 1 Parity: NONE WordLength: 8	
    47. 58	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_CHAR			EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13	
    48. 59	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_HANDFLOW			Shake:0 Replace:0 XonLimit:2048 XoffLimit:512	
    49. 60	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_TIMEOUTS			RI:-211527296 RM:-211527296 RC:0 WM:-211527296 WC:0	
    50. 61	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_BAUD_RATE				
    51. 62	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_LINE_CONTROL				
    52. 63	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_CHARS				
    53. 64	10:04:20	ImageComposer.e	IOCTL_SERIAL_GET_HANDFLOW				
    54. 65	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_BAUD_RATE			Rate: 9600	
    55. 66	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_RTS				
    56. 67	10:04:20	ImageComposer.e	IOCTL_SERIAL_CLR_DTR				
    57. 68	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_LINE_CONTROL			StopBits: 1 Parity: NONE WordLength: 8	
    58. 69	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_CHAR			EOF:1a ERR:0 BRK:0 EVT:1a XON:11 XOFF:13	
    59. 70	10:04:20	ImageComposer.e	IOCTL_SERIAL_SET_HANDFLOW			Shake:0 Replace:0 XonLimit:2048 XoffLimit:512
    To copy to clipboard, switch view to plain text mode 

    It seems that the line with Shake:0 Replace:0 XonLimit:2048 XoffLimit:512 changes the values all the time.

    The working output also writes this:
    Qt Code: 
    1. 28	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_TIMEOUTS	Nmserial1	SUCCESS	RI:-1 RM:-1 RC:-2 WM:0 WC:0	
    2. 29	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_WAIT_MASK	Nmserial1	SUCCESS	Mask: RXCHAR RXFLAG CTS DSR RLSD BRK ERR RING 	
    3. 30	10:03:04	SerialControl.e	IOCTL_SERIAL_SET_QUEUE_SIZE	Nmserial1	SUCCESS	InSize: 4096 OutSize: 2048
    To copy to clipboard, switch view to plain text mode 

    but i cant find any configuration for the conexion with this names!

    Can you help me?
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  4. 19th May 2010, 10:04 #4
    Lesiok
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    Default Re: qextserialport problem

    Are You sure that this is correct "CHR$(254)" ?
    You are sending 9 bytes representing this string, not one byte with value 254.
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  5. 19th May 2010, 10:48 #5
    cae
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    Default Re: qextserialport problem

    that was the problem, im sending wrong the orders, it works now

    thank you
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