# \[Hilo\] How to know module in in data mode?

**URL:** <https://forum.sierrawireless.com/t/hilo-how-to-know-module-in-in-data-mode/6543>\
**Category:** HL Series FAQ\
**Created:** [July 23, 2013, 3:40am UTC](https://forum.sierrawireless.com/t/hilo-how-to-know-module-in-in-data-mode/6543 "2013-07-23T03:40:44Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![FAQ\_Poster](https://avatars.discourse-cdn.com/v4/letter/f/f9ae1b/32.png) [@FAQ\_Poster](https://forum.sierrawireless.com/u/FAQ_Poster)\
**Post date:** [July 23, 2013, 3:40am UTC](https://forum.sierrawireless.com/t/hilo-how-to-know-module-in-in-data-mode/6543/1 "2013-07-23T03:40:44Z")

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Answer: You can use the DCD pin to indicate if the module is in data mode (You should set AT&C1 and AT&W before)  
DCD ON =\> in data mode,  
DCD OFF =\> in command mode