# How to send ATcommand to AR7550 when using Legato

**URL:** <https://forum.legato.io/t/how-to-send-atcommand-to-ar7550-when-using-legato/159>\
**Category:** Legato Application Framework\
**Created:** [August 27, 2015, 10:50am UTC](https://forum.legato.io/t/how-to-send-atcommand-to-ar7550-when-using-legato/159 "2015-08-27T10:50:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![wgd0909](https://avatars.discourse-cdn.com/v4/letter/w/13edae/32.png) [@wgd0909](https://forum.legato.io/u/wgd0909)\
**Post date:** [August 27, 2015, 10:50am UTC](https://forum.legato.io/t/how-to-send-atcommand-to-ar7550-when-using-legato/159/1 "2015-08-27T10:50:54Z")

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The UART2 is used for linux console, how to send ATcommand to AR7550 when using Legato?

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**Author:** ![danielgomezdn](https://avatars.discourse-cdn.com/v4/letter/d/f9ae1b/32.png) [@danielgomezdn](https://forum.legato.io/u/danielgomezdn)\
**Post date:** [September 4, 2015, 10:53am UTC](https://forum.legato.io/t/how-to-send-atcommand-to-ar7550-when-using-legato/159/2 "2015-09-04T10:53:51Z")

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Hi,

You can do in the AR7 module through the Linux Console:

$ microcom /dev/ttyAT

Also, you can configure the usbmode in acm mode:

$ cat /etc/legato/usbmode  
ecm  
acm

Note: reboot the target after new usb configuration

Then, new /dev/ttyACM0 device will appear in your Linux host machine when you connect the USB.

Regards,  
Daniel