Thanks guys.
Brian, I never registered my HG RF send commands with the SC1200: IThey do not have the extra security code attached, they are just the 7 bytes that say ARM or DISARM. They used to work here, and have been shown by others to work. The same 7 bytes have been shown to work on many folks SC1200s. Why I am asking my question as mine stopped working. Perhaps my cm15A is not sending them any longer; I will have to investigate that angle next.
Tuicemen, my question is reverse of what you mentioned. I remember your detailed testing and results that HG responds to ANY flob, but I think that receiving is opposite of my issue: I am sending from HG. I am not using the HG security module as my secure alarm system, I am using the secure SC1200. In parallel, I DO turn on the HG security module so that it effectively blinks lights when triggered, sends detailed emails when armed showing which security device caused the trigger, and also serves well to show a good history of all transmissions of my DS10 security modules. All that works fine. Just no more SC1200 arming from HG.