# Sending data from Xbee end device in sleep mode

**URL:** <https://forums.digi.com/t/sending-data-from-xbee-end-device-in-sleep-mode/12887>\
**Category:** XBee & XBee Gateway\
**Tags:** transmission, xbee, zigbee\
**Created:** [May 1, 2014, 8:27am UTC](https://forums.digi.com/t/sending-data-from-xbee-end-device-in-sleep-mode/12887 "2014-05-01T08:27:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![abdul](https://avatars.discourse-cdn.com/v4/letter/a/dfb087/32.png) [@abdul](https://forums.digi.com/u/abdul)\
**Post date:** [May 1, 2014, 8:27am UTC](https://forums.digi.com/t/sending-data-from-xbee-end-device-in-sleep-mode/12887/1 "2014-05-01T08:27:52Z")

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I am using XBee series 2 module for communication between arduino and computer. I have coordinator attached with computer and an end device with arduino. I want to send data from arduino after every 1 min. But the problem is i am using cyclic sleep mode on end device with ST (time before sleep = 5 sec which is default value). I first send data as soon as module is on which works fine.But then after 5 sec module enters in sleep mode. Then after 1 min i am unable to send data to computer. In fact my end device module does not communicate with arduino either. Any idea how to awake sleeping module?

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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 1, 2014, 9:47am UTC](https://forums.digi.com/t/sending-data-from-xbee-end-device-in-sleep-mode/12887/2 "2014-05-01T09:47:14Z")

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You must use hardware flow control to know when the radio is awake or in a sleeping state. You should also adjust the SP and ST times on the module to your desired sleep and wake periods.