Problem on UART handshaking signals


Hi all,

I am working Q24 Classics, in the UART connection, i am getting a clear response at Null Modem connection while connecting only TxD and RxD.

But in case of Hardware connection, while utilising all the 9 pins, i am not getting reponse from handshaking signals.
Especially when DTR, RTS is asserted to 0, we are not getting 0 logic level at the DSR and CTS pins.
Instead of that when i send my data, i receiving the data at RxD, CTS and DSR pins.
Because of these problem’s, i am not receiving any response for AT commands.

Also i am sure that the RS232 miscellaneous connections are good, i suspect on the H/W or S/W settings with wireless CPU and OpenAT.

Kindly help me


When posting anything, please choose the category that is MOST appropriate and only post the same contents ONCE. If you think you really need to post this in several places, you should let other people know about this fact. That would be nice.

I don’t think you’ll get a faster answer the more posts you do on the same issue…

Best Regards,


sorry for doing so,
can i have a feedback for that question