# Sleeping End node!!!

**URL:** <https://forums.digi.com/t/sleeping-end-node/959>\
**Category:** XBee - Zigbee\
**Created:** [October 9, 2012, 4:58am UTC](https://forums.digi.com/t/sleeping-end-node/959 "2012-10-09T04:58:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![pathik](https://avatars.discourse-cdn.com/v4/letter/p/6de8d8/32.png) [@pathik](https://forums.digi.com/u/pathik)\
**Post date:** [October 9, 2012, 4:58am UTC](https://forums.digi.com/t/sleeping-end-node/959/1 "2012-10-09T04:58:46Z")

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Hi

I have a system with one coordinator and few end nodes. I am using end node in SM=1 (pin sleep), I have external microcontroller that wakes up end node every 5 second and send data to the coordinator.

System is working correctly at this rate but if i extend sample to 15mints then system works but CTS response time and association of xbee coordinator are taking far longer time then expected (msec).

I am not sure what SP, SN setting should be!! does it affect pin sleep end nodes???

If any body has any suggestions.

Thank you  
Regards,

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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:** [October 11, 2012, 4:36pm UTC](https://forums.digi.com/t/sleeping-end-node/959/2 "2012-10-11T16:36:25Z")

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Sn/SP in the coordinator affects you - read this wiki page: [http://www.digi.com/wiki/developer/index.php/XBee\_Sleeping\_Problems](http://www.digi.com/wiki/developer/index.php/XBee_Sleeping_Problems)

What is probably happening is the coordinator has flushed/discarded the sleeping node by teh time it wakes, so the first thing your XBee in Sm=1 needs to do is in effect go off and find a new mesh to join! So you need the SN/SP in the _COORDINATOR_ to be large enough that it retains the child-table info.