read and write in serial port

[neda]

I remove the openSerialPort() call from the constructor.

MySerialPort::MySerialPort()
{
serial = new QSerialPort(this);


connect(serial, SIGNAL(readyRead()), this, SLOT(readData()));
connect(serial, SIGNAL(error(QSerialPort::SerialPortError)), this,
SLOT(handleError(QSerialPort::SerialPortError)));

//openSerialPort();
}

[anda_skoa]

If I understand the information on serial break correctly, you are getting a sort of data timeout on the line.
This is a hardware thing: http://ltxfaq.custhelp.com/app/answe...erial-break%3F

Maybe the device you are connected to can't keep up or is using different settings?

Cheers,
_

[neda]

If I understand the information on serial break correctly, you are getting a sort of data timeout on the line.
This is a hardware thing: http://ltxfaq.custhelp.com/app/answe...erial-break%3F

Maybe the device you are connected to can't keep up or is using different settings?

Cheers,
_

I read data with Hercules_3-2-6 Application (rs232 terminal software) http://www.qtcentre.org/threads/6510...nother-program

[neda]

My program worked today, and I have not any error.
But I do not any change to program.

When I run program,
program connects to port successfully, but I receive just one data (space).

But when I close this program and open Hercules_3-2-6 Application (rs232 terminal software), that application read data,
and after close Hercules_3-2-6 application and open terminal example again, this program works and reads data until restarting computer.

I repeat this process many times.

But my project does not receive data after restarting system until port opens one time by Hercules_3-2-6 Application.

Meanwhile I have virtual USB COM port and my hardware connected to computer with USB.

[neda]

I wrote a .net program.It worked very well likes to Hercules_3-2-6 Application and qt program worked after opening the program.
Is it bug of Qt 5.5.1 ?

[neda]

I added this line for handle error port.

voidMySerialPort::handleError(QSerialPort::SerialP ortErrorerror)
{
qDebug()<<"Error:"<<error;//I added this line
if(error==QSerialPort::ResourceError)
{
showStatusMessage(serial->errorString());
closeSerialPort();
}
}

Result of run program:

Error: 0
"Connectedd"
Error: 6
"\x00"


Just sometimes I have error 6.
How do I fix break condition error?

[kuzulis]

> How do I fix break condition error?

Nohow. It is HW/driver issue.

UPD: Future Qt 5.6.0 won't be process the Parity/Frame and BreakCondition errors anymore. So, you can try QtSeriaslPort from 5.6.0 branch.

[neda]

> How do I fix break condition error?

Nohow. It is HW/driver issue.

UPD: Future Qt 5.6.0 won't be process the Parity/Frame and BreakCondition errors anymore. So, you can try QtSeriaslPort from 5.6.0 branch.

Of course,My program is problem because other programs (C# .net , Hercules) work very well.
My problem is bug of QSerialPort?

[kuzulis]

> Of course,My program is problem because other programs (C# .net , Hercules) work very well.

So what? Maybe they (those programs) do not trace the EV_ERR event flag. This flag coming from the device driver, and QtSerialPort < 5.6 handles this error when it is occurred.

> My problem is bug of QSerialPort?

You problem is bug of HW/driver of device.

[neda]

Thanks you very much.
Your answer was a big help for me.

serial->setDataTerminalReady(false);