# Strange behaviour of XBee moduls (XB24-B Z7WIT-004)

**URL:** <https://forums.digi.com/t/strange-behaviour-of-xbee-moduls-xb24-b-z7wit-004/1562>\
**Category:** XBee - 802.15.4\
**Created:** [July 19, 2010, 8:32am UTC](https://forums.digi.com/t/strange-behaviour-of-xbee-moduls-xb24-b-z7wit-004/1562 "2010-07-19T08:32:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![qwer85](https://avatars.discourse-cdn.com/v4/letter/q/49beb7/32.png) [@qwer85](https://forums.digi.com/u/qwer85)\
**Post date:** [July 19, 2010, 8:32am UTC](https://forums.digi.com/t/strange-behaviour-of-xbee-moduls-xb24-b-z7wit-004/1562/1 "2010-07-19T08:32:06Z")

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Hi everybody!

I have more serious problem with my pair of Xbee’s. First of all, when I was first attach one of them via serial interface to X-CTU, and clicked to Test/Query, a messagebox appeared that I have XB24-B modem. After that I clicked read parameters and XCTU loaded the XB24-ZB ZigBee Coordinator AT function set from the modem. That was a bit strange, but I’ve neglect it. I changed some settings (if I remember, the PAN ID and SCANCH) and I wrote back to modem. And that point XCTU said, there was a problem, and from that I couldn’t communicate with the modem. Finally I found some tutorial to ‘debrick’, but when I check API mode It says Communication OK, but Modem type unknown. In AT mode it works well, but when I update to Coordinator API in AT mode, the API mode works well, and the AT mode go wrong. I want to use in AT mode, and with end-device function set. But when I upgrade the function set to end-dev, the modem don’t want to connect to the PAN organized by a coordinator (same PAN ID, same SCANCH, instructions followed by this tutorial: [http://www.youtube.com/watch?v=VzgUtZyiHhE](http://www.youtube.com/watch?v=VzgUtZyiHhE))  
And when I change back to coord-at function set, it finds a free channel (E). Do you think that the problem with API mode (described above) cause this malfunction? Please help me! Thanks.

Ps: I tried to change the other Xbee modul’s function set to end-dev-at, and this one to coord-at, but the problem is still, coord has channel 12, and end-dev has channel 0, ATAI command say 0x21 (Scan found no PANs). Coord returns with 0x00 (means network started)

Big Thank for your help guys…

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**Author:** ![johnf](https://avatars.discourse-cdn.com/v4/letter/j/848f3c/32.png) [@johnf](https://forums.digi.com/u/johnf)\
**Post date:** [July 21, 2010, 2:37pm UTC](https://forums.digi.com/t/strange-behaviour-of-xbee-moduls-xb24-b-z7wit-004/1562/2 "2010-07-21T14:37:52Z")

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It doesn’t look as though anyone here knows the answer, but as your XBees are series 2 (Ember) versions you’ll probably get better results if you post in the Zigbee Pro forum. This forum is for series 1 XBees - you’re perfectly welcome here, it’s just that the experts you need will probably be over there. Good luck!