# How can I identify series 1 modules? **URL:** \ **Category:** XBee - 802.15.4\ **Created:** [December 2, 2008, 1:27pm UTC](https://forums.digi.com/t/how-can-i-identify-series-1-modules/1337 "2008-12-02T13:27:59Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![kubiajir](https://avatars.discourse-cdn.com/v4/letter/k/e19b73/32.png) [@kubiajir](https://forums.digi.com/u/kubiajir)\ **Post date:** [December 2, 2008, 1:27pm UTC](https://forums.digi.com/t/how-can-i-identify-series-1-modules/1337/1 "2008-12-02T13:27:59Z")
Hi, Im newbie to this XBee modules. I borrowed some zigbee modules (MaxStream rev:11) for testing with ConnectMe 9210. I find out that I have to use ZNET 2.5 stack which I cant upload to module (it reports: Incompatable modem selected for programming). In this forum I found that there is two kinds of XBee modules - series 1 and series 2. How can I determine which series I have? How can I buy series 2? And one more question what is difference between ZNET 2.5 stack and 802.15.4 stack? Thanks Jirka ---
**Author:** ![16ksa23](https://avatars.discourse-cdn.com/v4/letter/1/aeb1de/32.png) [@16ksa23](https://forums.digi.com/u/16ksa23)\ **Post date:** [September 17, 2013, 6:48am UTC](https://forums.digi.com/t/how-can-i-identify-series-1-modules/1337/2 "2013-09-17T06:48:41Z")
The big difference between 802.15.4 and all the other models is that with 802.15.4, if one XBee wants to send a message to another, they have to be directly in range. All the other models allow messages to be relayed through intermediate XBees, which means you can then set up a network that covers a much larger geographical area. 802.15.4 is a firmware version that runs on the Series 1 hardware. ZNet2.5 is a firmware version that runs on the Series 2 hardware. The following link gives you clear picture of different types of XBee modules, [http://www.digi.com/wiki/developer/index.php/XBee\_Product\_Codes#DD\_upper\_word\_:\_Module\_Type](http://www.digi.com/wiki/developer/index.php/XBee_Product_Codes#DD_upper_word_:_Module_Type)