# Incomprehensible Documentation: Direct UART Access

**URL:** <https://forum.sierrawireless.com/t/incomprehensible-documentation-direct-uart-access/4134>\
**Category:** Documentation feedback\
**Created:** [January 25, 2010, 7:11pm UTC](https://forum.sierrawireless.com/t/incomprehensible-documentation-direct-uart-access/4134 "2010-01-25T19:11:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\
**Post date:** [January 25, 2010, 7:11pm UTC](https://forum.sierrawireless.com/t/incomprehensible-documentation-direct-uart-access/4134/1 "2010-01-25T19:11:34Z")

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> [@ADL User Guide for Open AT® OS v6.21](#):
>
> 4.1 Open UART Interface
> 
> A UART service provider handled by the Wavecom firmware is not available for an Open AT® application.
> 
> A UART service provider handled by an Open AT® application is not available for the Wavecom firmware.
> 
> In both previous cases, an attempt to get access to an already used UART service provider returns an error to the requestor.

That’s about as clear as mud!

See: [viewtopic.php?f=78&t=4504&p=18186#p18186](http://www.wavecom.com/modules/movie/scenes/forums/viewtopic.php?f=78&t=4504&p=18186#p18186)