# I cannot open UART

**URL:** <https://forum.sierrawireless.com/t/i-cannot-open-uart/6260>\
**Category:** Legacy AirPrime modules\
**Created:** [April 12, 2013, 2:47am UTC](https://forum.sierrawireless.com/t/i-cannot-open-uart/6260 "2013-04-12T02:47:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![TakafusaMiura](https://avatars.discourse-cdn.com/v4/letter/t/90ced4/32.png) [@TakafusaMiura](https://forum.sierrawireless.com/u/TakafusaMiura)\
**Post date:** [April 12, 2013, 2:47am UTC](https://forum.sierrawireless.com/t/i-cannot-open-uart/6260/1 "2013-04-12T02:47:20Z")

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Hello.

I would like to download data to communication unit by serial(RS232C).  
So, in order to test communication of UART, I downloaded AT project sample “uart\_access” to the communication unit and run.  
smaple “uart\_access” tries to open UART by API adl\_OpenDevice().  
But, opening of UART1 and UART2 goes wrong.  
Is there any cause considered by something?  
Is there any method of acquiring the details of an error?

My development environment is following.

Developer Studio : version 2.3.0  
LSI of communication unit : SL8084T  
Communication unit : AX8084NE

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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:** [April 12, 2013, 6:06am UTC](https://forum.sierrawireless.com/t/i-cannot-open-uart/6260/2 "2013-04-12T06:06:25Z")

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I would recommend that you try FCM (the “Flow Control Manager”) first.

The Open UART is a more “advanced” interface - not the place for a beginnger to start.