# why End device continousely sending data\_request to it parents **URL:** \ **Category:** XBee Programamble (S2C & 900 HP)\ **Created:** [June 1, 2012, 9:13am UTC](https://forums.digi.com/t/why-end-device-continousely-sending-data-request-to-it-parents/11230 "2012-06-01T09:13:29Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![sandip](https://avatars.discourse-cdn.com/v4/letter/s/ecae2f/32.png) [@sandip](https://forums.digi.com/u/sandip)\ **Post date:** [June 1, 2012, 9:13am UTC](https://forums.digi.com/t/why-end-device-continousely-sending-data-request-to-it-parents/11230/1 "2012-06-01T09:13:29Z")
I am using DIGI SMT module and I have configure it as Enddevice and I have made the network of 4 router +4 end device and one coordinator. - I have bind the End device with router by writting the SH and SL of router to end device DH and DL and same done in to router… - But as I seen in to sniffer … End device every time sending data request to it parent continousely … - you can see the sniffer screen shot in to attached document along with this mail… - Why this end device continousely sending data\_request to it paranet at every 5 to 10 second interval… - I have attached the RF parameter setting of End device along with this post forum… ---
**Author:** ![lynnl](https://avatars.discourse-cdn.com/v4/letter/l/22d042/32.png) [@lynnl](https://forums.digi.com/u/lynnl)\ **Post date:** [June 5, 2012, 6:19pm UTC](https://forums.digi.com/t/why-end-device-continousely-sending-data-request-to-it-parents/11230/2 "2012-06-05T18:19:03Z")
A few things. By default, the Xbee end-devcie MUST poll the parent every 100msec because the PO (P-Oh, not P-zero) setting is a default of 0. This is the nature of ZigBee - one cannot talk to an end-device; one talks to the parent as proxy and the parent buffers the data waiting for the end-devcie to poll the parent. Therefore, end-devices when awake are very chatty, sending at least 10 packets per second. I see your ST=65535, which means the devices are always awake. Your SN/SP of 1x200 is shorter than ST, so your devcie should never sleep. Normally, if I has Sn/Sp or 1x200 (so wake every 2 seconds), I would probably set ST to 200 so the end-device is only awake for 200msec, plus cut the PO to be maybe 5 so it can poll the parent 4 or 5 times before sleeping. I always set fully awake Xbee to run as routers as then they are quiet and don’t talk unless they need to say something.