Tom, sorry we are late releasing the expanded document on the EZSnsRF (we are actually busy bringing out an X10 version). But we were not planning to cover the group messages sent in response to a sensor input. Your observation is that of a standard group command that the EZSnsRF sends in response to a sensor signal being received.
Perhaps if you tell us more of what you need to see, or what application you are developing, we can then figure out what additional documention to release.
Sorry if we are not addressing your need quickly enough!!