# SL8092 - Discover Tool Mishap

**URL:** <https://forum.sierrawireless.com/t/sl8092-discover-tool-mishap/6242>\
**Category:** Legacy AirPrime modules\
**Created:** [April 4, 2013, 10:42am UTC](https://forum.sierrawireless.com/t/sl8092-discover-tool-mishap/6242 "2013-04-04T10:42:57Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![snatch59](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/snatch59/32/2047_2.png) [@snatch59](https://forum.sierrawireless.com/u/snatch59)\
**Post date:** [April 4, 2013, 10:42am UTC](https://forum.sierrawireless.com/t/sl8092-discover-tool-mishap/6242/1 "2013-04-04T10:42:57Z")

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Hi,

I connected up the SL8092 via USB to the Discovery Tool - no issues. Accidentally set the SL8092 into UART mode using the Discovery Tool, and I don’t have a serial interface (i.e. RS232 with RTS/CTS and level converter to 1.8V). Any way to set the SL8092 back to USB mode?

[Given if I had a serial interface, I see a lot about AT+WHCNF/WMFM in the Product Tech Spec/Design Guidelines (and in this forum), however I have the AT Command and UMTS Extended AT Guide, but neither documents mention it. Any clue to where WHCNF or WMFM is documented for use with the SL series?]

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**Author:** ![Rex\_alex](https://avatars.discourse-cdn.com/v4/letter/r/73ab20/32.png) [@Rex\_alex](https://forum.sierrawireless.com/u/Rex_alex)\
**Post date:** [April 4, 2013, 11:51am UTC](https://forum.sierrawireless.com/t/sl8092-discover-tool-mishap/6242/2 "2013-04-04T11:51:41Z")

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Hi,

check for AT!MAPUART command.  
Also AT+WHCNF command is also available for SL module.

Both the commands can be found in “2130616 Extended AT command guide”.

WMFM command is not available.

Thanks.

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**Author:** ![tobias](https://avatars.discourse-cdn.com/v4/letter/t/c67d28/32.png) [@tobias](https://forum.sierrawireless.com/u/tobias)\
**Post date:** [April 5, 2013, 8:55am UTC](https://forum.sierrawireless.com/t/sl8092-discover-tool-mishap/6242/3 "2013-04-05T08:55:22Z")

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AT+WHCNF is a locked command by default IIRC, and requires that you run:  
AT!ENTERCND="…"  
where … is to be replaced with some code.  
Not sure if that’s public, so can’t post it here.

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**Author:** ![snatch59](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/snatch59/32/2047_2.png) [@snatch59](https://forum.sierrawireless.com/u/snatch59)\
**Post date:** [April 10, 2013, 4:48pm UTC](https://forum.sierrawireless.com/t/sl8092-discover-tool-mishap/6242/4 "2013-04-10T16:48:37Z")

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Thanks to all for the replies.

Once I got a MAX3232 chip/board and a (SparkFun) Level Converter, plus two 10K ohm resistors to give me 1.8V for the level converter from the 3.6V supply, I was able to hook up my embedded Linux board to the SL8092 and get it back to USB mode using ‘AT!MAPUART=7’.

I now have a useful serial comms wiring diagram! 😃