The two most common RF radios that are available from Digi are the 802.15.4 and ZB. The 802.15.4 and ZB modules are quite similar, but selection of a module should be based upon application specific needs.
All XBee radios have the same footprint and for the most part-are pin for pin compatible (with a few differences in the placement of ADC/IO lines), but are NOT interoperable. The 802.15.4 and ZB (Zigbee) (S2 and S2C) modules offer different application profiles, which are unique to each radio family. They can however, use the same RS232 or USB interface boards.
Product comparison specification Quick Facts for the non-pro variant of the three products:
Since hardware specifications are similar, the differences between XBee 802.15.4 and ZB are more evident in the firmware features. Listed below are some of the more defining differences in the firmware:
A study of the product manuals to compare the XBee 802.15.4, ZB (S2) and the ZB (S2C) radios more completely is left to the user. However, Digi Applications Engineers are available to discuss these differences in greater detail, and can be reached at 1-801-765-9885.