# Stop Allowing joins after CB2 on coordinator

**URL:** <https://forums.digi.com/t/stop-allowing-joins-after-cb2-on-coordinator/13463>\
**Category:** XBee - 802.15.4\
**Tags:** coordinator, xbee\
**Created:** [August 13, 2014, 1:41pm UTC](https://forums.digi.com/t/stop-allowing-joins-after-cb2-on-coordinator/13463 "2014-08-13T13:41:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![k4bri](https://avatars.discourse-cdn.com/v4/letter/k/b782af/32.png) [@k4bri](https://forums.digi.com/u/k4bri)\
**Post date:** [August 13, 2014, 1:41pm UTC](https://forums.digi.com/t/stop-allowing-joins-after-cb2-on-coordinator/13463/1 "2014-08-13T13:41:36Z")

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Here is my configuration - Coordinator has NJ=0 to not allow joins. I want to allow ONE router to join, so I issue a CB=2 to allow joins for 60 seconds. One router joins - great! I get the API frame 0x95 so I know that a router has joined. Now, how can I not allow any other routers to join for the rest of the 60 seconds?  
Thanks for any info.

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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:** [August 18, 2014, 2:31pm UTC](https://forums.digi.com/t/stop-allowing-joins-after-cb2-on-coordinator/13463/2 "2014-08-18T14:31:29Z")

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All you can do is to set NJ to 0.