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Hi As far as I understand, your circumstance likes the below figure. 1. Communication is failed with a virtual serial port. <img src="../../images/qna_560_01.png" width="450" height="250" alt=""> 2. Communication is succeeded without a virtual serial port <img src="../../images/qna_560_02.png" width="450" height="210" alt=""> In the above case, you should check if the data from the PC to the EZL-70 on each case are the same because you used different source program in both environments. Please compare the “data 1” in case 1 and “data A” in case 2. It will be greatly helpful for supporting and solving your problem that you capture and send the packet to us with Wireshark which is a network packet analyzing program. E-mail: support@eztcp.com You can download the program on the below site for free. <a href = "http://www.wireshark.org/download.html" target=new> Download</a> If you have further questions, please let me know. Thanks > nonde wrote: > ~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Hello > > I have used ezvsp 2.3b software for creating a virtual serial port > with EZL 70 device working in client mode (COD2) > COM8 port has been succesfully created > When I open an RS232 application program I get the indication > Port OPEN 9600 8 n1 but when i try to send a protocol command > to the serial device I get no response > However, the communication in the TCP server (the server in which > EZL 70 is connected) is correct and I can see the serial messages > from the RS232 device coming on the TCP server > messages from TCP server to the serial device are properly transfered > and the RS232 device responds correctly > > The problem is that I can not send transmitting message from the normal RS232 > control program to the serial device through the serial port > It seems that the command is sent to unit ( is shown on the TCP server) > but the RS232 device does not respond > > I would highly appreciate any help
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