# Problem on UART handshaking signals **URL:** \ **Category:** General\ **Created:** [June 19, 2007, 8:48am UTC](https://forum.sierrawireless.com/t/problem-on-uart-handshaking-signals/1412 "2007-06-19T08:48:47Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![jayemb](https://avatars.discourse-cdn.com/v4/letter/j/3e96dc/32.png) [@jayemb](https://forum.sierrawireless.com/u/jayemb)\ **Post date:** [June 19, 2007, 8:48am UTC](https://forum.sierrawireless.com/t/problem-on-uart-handshaking-signals/1412/1 "2007-06-19T08:48:47Z")
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 ---
**Author:** ![jan](https://avatars.discourse-cdn.com/v4/letter/j/ce7236/32.png) [@jan](https://forum.sierrawireless.com/u/jan)\ **Post date:** [June 19, 2007, 9:11am UTC](https://forum.sierrawireless.com/t/problem-on-uart-handshaking-signals/1412/2 "2007-06-19T09:11:40Z")
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, Jan ---
**Author:** ![jayemb](https://avatars.discourse-cdn.com/v4/letter/j/3e96dc/32.png) [@jayemb](https://forum.sierrawireless.com/u/jayemb)\ **Post date:** [June 19, 2007, 10:41am UTC](https://forum.sierrawireless.com/t/problem-on-uart-handshaking-signals/1412/3 "2007-06-19T10:41:03Z")
sorry for doing so, can i have a feedback for that question