bannerbar

Support > Technical Support

Q&A / Technical Support

Name	E-mail

Company Name

Subject

Contents
Thank you for your detailed information. This case seems to occur by buffer overflow of virtual COM port made by ezVSP. I faced a similar problem with virtual COM port. Here are solutions. 1. Enabling RTS/CTS flow control on the COM5. 2. Enabling [Emulation of Baudrate] option on the advanced menu of the virtual port setting. (I recommend using the latest version of ezVSP - 4.1B) You can avoid the data loss using at least one of solutions. Best Regards, > Joerg wrote: > ------------------------------------ > Hi, > > my situation is the following: On "Windows 7 Professional", I use two terminal programms on both ends (com5 and com10). > Com5 is a virtual com port created by your ezVSP software. Com10 is the EZL-70(A). > I am using this code to produce the error: > > void MainWindow::writeBlock() > { > QByteArray data; > unsigned char c; > c = 'sA's; > > if (serial->isOpen()) { > for (int i = 0; i < 59; i++ ) { > data.append(c); > c++; > } > data.append('s> 's); > for (int i = 0; i < 1000; i++ ) { > if (serial->write(data)<0) { > QMessageBox::about(this,"Error" ,serial->errorString()); > } > } > } > } > > > The direction com10 to com5 works fine. Only the way from com5 (virtual com port) to com10 is wrong. > Please open the screenshot. The ABC... at the 8193 char has overwritten the abc.. ! > > After further investigation I have found the following: > > 1) With ezVSP 4.0 D the transmission stops after 8192 bytes. > 2) With ezVSP 4.1 B the transmission will be modified as you can see in the screenshot. > 3) With a 0-modem cable between com5 and com10 everything is fine. (Using the same USB to RS232 dongles and the same testsoftware ). > > Please try to reprodruce this with ezVSP 4.1B. > > Thanks in advance. > > Regards > Joerg > > > > Sollae Systems wrote: > > ------------------------------------ > > Hi. > > > > Unfortunately, we could not find any data loss with the same condition of yours. > > We tried to send 16,384 bytes data to both socket and serial sides at the same time. > > Can you give us more specific information about your situation? > > > > Thanks in advance. > > > > > Joerg wrote: > > > ------------------------------------ > > > Hello Support! > > > > > > We are using a EZL-70 (A) with the firmware version 1.2E, 9600 baud, 8E1, "Tx Delay" is on, "Disable TCP Transmission Delay" is on as a "TCP Server". > > > > > > Whenever I send more than 8192 characters stops the transmission. > > > The rest of the data will be lost. In the most cases, I can continue > > > by sending the message again. > > > > > > Is there a new firmware to solve the problem? > > > > > > Regards, > > > Joerg
Password

Attachment(Image, ZIP file under 2MB)