# Data Mode with AT commands

**URL:** <https://forum.sierrawireless.com/t/data-mode-with-at-commands/18186>\
**Category:** Legacy HL Series\
**Created:** [November 4, 2019, 10:45am UTC](https://forum.sierrawireless.com/t/data-mode-with-at-commands/18186 "2019-11-04T10:45:07Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![zaki\_ncbistudent](https://avatars.discourse-cdn.com/v4/letter/z/6bbea6/32.png) [@zaki\_ncbistudent](https://forum.sierrawireless.com/u/zaki_ncbistudent)\
**Post date:** [November 4, 2019, 10:45am UTC](https://forum.sierrawireless.com/t/data-mode-with-at-commands/18186/1 "2019-11-04T10:45:07Z")

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Hello,

i am using the usb ports on HL7800 on a linux enviroment. I was wondering how to use the data mode with the AT commands such that i can use multiple ports. Sending ‘+++’ does not work to return to command mode.

Thank you,

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**Author:** ![Sierra\_klin2](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/sierra_klin2/32/4769_2.png) [@Sierra\_klin2](https://forum.sierrawireless.com/u/Sierra_klin2)\
**Post date:** [November 5, 2019, 6:37am UTC](https://forum.sierrawireless.com/t/data-mode-with-at-commands/18186/2 "2019-11-05T06:37:44Z")

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Hi zaki\_ncbistudent，

If you make PPP dial up, you need to make sure no \<CR/LF\> added at the end of “+++”.  
If you make KUDP/KTCP/KHTTP/ service, you need to use “–EOF–Pattern–” (no \<CR/LF\> at the end of the string) to exit the data mode.