# GL8200 AT response

**URL:** <https://forum.sierrawireless.com/t/gl8200-at-response/9752>\
**Category:** GL Series\
**Created:** [January 19, 2018, 6:07pm UTC](https://forum.sierrawireless.com/t/gl8200-at-response/9752 "2018-01-19T18:07:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ecosid](https://avatars.discourse-cdn.com/v4/letter/e/85f322/32.png) [@ecosid](https://forum.sierrawireless.com/u/ecosid)\
**Post date:** [January 19, 2018, 6:07pm UTC](https://forum.sierrawireless.com/t/gl8200-at-response/9752/1 "2018-01-19T18:07:30Z")

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I have a recently purchased GL8200, connected to a windows PC via serial port. When connecting via Putty and entering AT, all I get back is ▒ (in case that doesn’t show up here, it’s a block symbol). Does anyone know what that means / where I might have gone wrong?

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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 21, 2018, 11:51pm UTC](https://forum.sierrawireless.com/t/gl8200-at-response/9752/2 "2018-01-21T23:51:59Z")

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Usually, getting garbage displayed by a terminal indicates that you have the baud rate wrong.

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**Author:** ![ecosid](https://avatars.discourse-cdn.com/v4/letter/e/85f322/32.png) [@ecosid](https://forum.sierrawireless.com/u/ecosid)\
**Post date:** [January 23, 2018, 3:58pm UTC](https://forum.sierrawireless.com/t/gl8200-at-response/9752/3 "2018-01-23T15:58:58Z")

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Yep… Made the mistake of sticking blindly to the user guide’s recommendation of 115200… 38400 worked. Thanks!