# Please help serious problem with uart1 **URL:** \ **Category:** Open AT\ **Created:** [June 12, 2007, 7:21am UTC](https://forum.sierrawireless.com/t/please-help-serious-problem-with-uart1/1388 "2007-06-12T07:21:36Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![DIP](https://avatars.discourse-cdn.com/v4/letter/d/8dc957/32.png) [@DIP](https://forum.sierrawireless.com/u/DIP)\ **Post date:** [June 12, 2007, 7:21am UTC](https://forum.sierrawireless.com/t/please-help-serious-problem-with-uart1/1388/1 "2007-06-12T07:21:36Z")
I have written an embeded program for switching the UART1 to data mode from AT mode.Now it has gone to data mode and I cannot use the port for at commands,not even I can download any program using AT+WDWL. So please kindly help me to fix the problem to bring back the UART1 port to AT mode. ---
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [June 12, 2007, 8:29am UTC](https://forum.sierrawireless.com/t/please-help-serious-problem-with-uart1/1388/2 "2007-06-12T08:29:03Z")
Isn’t hindsight is a wonderful thing?! 😉 In my application, I ensure that there is a delay after the module starts before it switches the UART to Data mode - specifically so that I can type an AT+WOPEN=0 to stop the application, if necessary! 8) If you’re very quick, you might find that it’s possible to get an AT+WOPEN=0 in before the UART goes to Data mode - do you have an application that can set this up as a single-key command? Failing that, you’ll have to use the Wavecom DWLWin utility to re-flash the module - contact your distributor for details… ---
**Author:** ![DIP](https://avatars.discourse-cdn.com/v4/letter/d/8dc957/32.png) [@DIP](https://forum.sierrawireless.com/u/DIP)\ **Post date:** [June 12, 2007, 9:30am UTC](https://forum.sierrawireless.com/t/please-help-serious-problem-with-uart1/1388/3 "2007-06-12T09:30:41Z")
THANX again buddy.Please can u send me the winDWL utility and the required firmwire files along with instruction manual.I am using wismo quick q2406b module. ---
**Author:** ![jan](https://avatars.discourse-cdn.com/v4/letter/j/ce7236/32.png) [@jan](https://forum.sierrawireless.com/u/jan)\ **Post date:** [June 12, 2007, 9:42am UTC](https://forum.sierrawireless.com/t/please-help-serious-problem-with-uart1/1388/4 "2007-06-12T09:42:35Z")
As awneil says, you need to contact your distributor for the tool… Best Regards, Jan ---
**Author:** ![DIP](https://avatars.discourse-cdn.com/v4/letter/d/8dc957/32.png) [@DIP](https://forum.sierrawireless.com/u/DIP)\ **Post date:** [June 12, 2007, 10:52am UTC](https://forum.sierrawireless.com/t/please-help-serious-problem-with-uart1/1388/5 "2007-06-12T10:52:19Z")
Is there any other way to stop the embeded application or to overwrite the embeded application? ---
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [June 12, 2007, 3:26pm UTC](https://forum.sierrawireless.com/t/please-help-serious-problem-with-uart1/1388/6 "2007-06-12T15:26:12Z")
Did you try my suggestion of getting the AT+WOPEN=0 command in very quickly as soon as the module powers-up? ---
**Author:** ![malek77](https://avatars.discourse-cdn.com/v4/letter/m/779978/32.png) [@malek77](https://forum.sierrawireless.com/u/malek77)\ **Post date:** [June 13, 2007, 7:52am UTC](https://forum.sierrawireless.com/t/please-help-serious-problem-with-uart1/1388/7 "2007-06-13T07:52:29Z")
Use Terminal Emulator, so you can paste command with then send command quickly. ---
**Author:** ![colin-tfe](https://avatars.discourse-cdn.com/v4/letter/c/cdc98d/32.png) [@colin-tfe](https://forum.sierrawireless.com/u/colin-tfe)\ **Post date:** [June 13, 2007, 8:02am UTC](https://forum.sierrawireless.com/t/please-help-serious-problem-with-uart1/1388/8 "2007-06-13T08:02:33Z")
i would suggest Jan’s terminal ! Because with Terminal Emulator, you need to synchronize the comm every time the module reboots (or every time you start the module)… see : [wavecom.com/modules/movie/sc … .php?t=995](http://www.wavecom.com/modules/movie/scenes/forums/viewtopic.php?t=995) ps : by the way, thank you Jan ! It helps me a lot in such cases… and in others too… 🙂 ---
**Author:** ![DIP](https://avatars.discourse-cdn.com/v4/letter/d/8dc957/32.png) [@DIP](https://forum.sierrawireless.com/u/DIP)\ **Post date:** [June 14, 2007, 6:44am UTC](https://forum.sierrawireless.com/t/please-help-serious-problem-with-uart1/1388/9 "2007-06-14T06:44:46Z")
I have made a VB program which can send AT+WOPEN=0 just by a button click.After making the module on I am sending AT+WOPEN=0 with a carriage return by clicking that button,but nothing is happening.Is the port permanently configured for data mode?Please suggest to fix the problem.