# Fcm

**URL:** <https://forum.sierrawireless.com/t/fcm/5237>\
**Category:** Open AT\
**Created:** [September 13, 2011, 5:09pm UTC](https://forum.sierrawireless.com/t/fcm/5237 "2011-09-13T17:09:17Z")\
**Posts on this page:** 1\
**Showing post:** 3

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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:** [September 14, 2011, 7:07am UTC](https://forum.sierrawireless.com/t/fcm/5237/3 "2011-09-14T07:07:51Z")

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> [@zafer](#):
>
> You can read ADL User Guide FCM Service topic. The documantation lists all avaliable functions about UART service.

Indeed.

And note that they are functions - not “commands”.

> [@](#):
>
> first you have to subscribe uart, then send some data

Before sending data, you must switch to Data mode.

But the error mentioned is a compiler error; ie, nothing to do with the run-time operation.

There are examples included with the Developer Studio.  
There is an example in the Code Sharing Area of the forum, here: [Simple UART Echo Program](https://forum.sierrawireless.com/t/simple-uart-echo-program/4739/1)

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