# What is the wake up period for XBee series 2 ( XB24-B) modules?

**URL:** <https://forums.digi.com/t/what-is-the-wake-up-period-for-xbee-series-2-xb24-b-modules/14812>\
**Category:** XBee - DigiMesh\
**Tags:** sleep, xbee\
**Created:** [May 5, 2015, 2:18am UTC](https://forums.digi.com/t/what-is-the-wake-up-period-for-xbee-series-2-xb24-b-modules/14812 "2015-05-05T02:18:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![swamygovinda](https://avatars.discourse-cdn.com/v4/letter/s/dc4da7/32.png) [@swamygovinda](https://forums.digi.com/u/swamygovinda)\
**Post date:** [May 5, 2015, 2:18am UTC](https://forums.digi.com/t/what-is-the-wake-up-period-for-xbee-series-2-xb24-b-modules/14812/1 "2015-05-05T02:18:55Z")

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Hi  
I am using XBee Series 2 (XB24-B) modules.  
I configured one module as end device and another module as coordinator.  
For end device to sample and transmit the data periodically at every 5 seconds I configured sleep period (SP) as 5 seconds and Sample rate(IR) as 50ms…  
Is the configuration correct?  
What is the wake up period for these modules ?  
so that I can set the sample rate accordingly, such that sample rate (IR) should not exceed the wake period.

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**Author:** ![mvut](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/mvut/32/31_2.png) [@mvut](https://forums.digi.com/u/mvut)\
**Post date:** [May 5, 2015, 8:31am UTC](https://forums.digi.com/t/what-is-the-wake-up-period-for-xbee-series-2-xb24-b-modules/14812/2 "2015-05-05T08:31:37Z")

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I would suggest setting the WH to 5, and the ST to an Ascii value of 50.