# XBee Synchronization sleep

**URL:** <https://forums.digi.com/t/xbee-synchronization-sleep/1150>\
**Category:** XBee - DigiMesh\
**Created:** [February 16, 2012, 8:22am UTC](https://forums.digi.com/t/xbee-synchronization-sleep/1150 "2012-02-16T08:22:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![yaotiger](https://avatars.discourse-cdn.com/v4/letter/y/839c29/32.png) [@yaotiger](https://forums.digi.com/u/yaotiger)\
**Post date:** [February 16, 2012, 8:22am UTC](https://forums.digi.com/t/xbee-synchronization-sleep/1150/1 "2012-02-16T08:22:00Z")

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when my XBEE S1 module(router)(Cyclic Sleep Mode (SM=8)) connenct directly to PC or powered by battery without connent anything, i changed my coordinator sleep time ,the router will Synchronized with coordinator.  
When i connect the router to a MCU,nothing else changed,if the sleep time set the same as coordinator ,coordinator and my board communicate very well. But when i changed my coordinator sleep time ,my router can not follow the coordinator .It’s still wake up depends on the original sleep time. I am realy puzzled,i need your help,thans.

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**Author:** ![lynnl](https://avatars.discourse-cdn.com/v4/letter/l/22d042/32.png) [@lynnl](https://forums.digi.com/u/lynnl)\
**Post date:** [March 1, 2012, 3:34pm UTC](https://forums.digi.com/t/xbee-synchronization-sleep/1150/2 "2012-03-01T15:34:36Z")

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Is this DigiMesh?

You probably need to look at SO (sleep options) to make sure your coordinator is acting as ‘sleep coordinator’.

For example, I run my DigiMesh with my coordinator set to SM=7, SO=0x05, and the remote ‘sleeper’ has SM=8 and SO=0x02 (default). You should be able to set the coordinator to SM=0x08 as well, I just don’t use DM that way.

Anyway, the SO=0x05 is what informs the coordinator to ‘share’ it’s sleep settings.

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**Author:** ![yaotiger](https://avatars.discourse-cdn.com/v4/letter/y/839c29/32.png) [@yaotiger](https://forums.digi.com/u/yaotiger)\
**Post date:** [March 7, 2012, 3:30am UTC](https://forums.digi.com/t/xbee-synchronization-sleep/1150/3 "2012-03-07T03:30:39Z")

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Thank you for your help,lynnl.  
i have already resolve this problem,as you said,i changed SM register to 7,make the xbee module support sleep mode.  
your advice S0=0x05 is very useful for me ,thank you very much!