Quote Originally Posted by Leith Ross View Post
Hello mc720519,

There are many reasons this could be happening. I need to know more about the equipment you are communicating with.

Are you the only person accessing the port?

Which protocol or protocols does the equipment support, e.g. RTS, X/ON, etc?

Which versions of Windows are you using?

Is your computer 32 or 64 bits?

Hi Leith,
I am using Win7-32bit, and use RS232 to control AP router by connecting USB port of Notebook. I think that is RTS/CTS
I can establish COM port and enter it. And, read data at [C15] (Receiver String), but just can not send command.
for your question: yes, I am the only person accessing the port.
BTW, I have a lose item at tool item: VideoSoft VSFlex 6.0 Control and VideoSoft VSFlex 7.0
Thanks