So, The Honeywell HSIM module worked perfectly with the Honeywell VISTA 21IP and C4 version 2.10.6.
It has not been working since my upgrade to OS3.
Can other confirm that is correct that the HSIM and OS3 are not compatiable/functioning properly?
If that is the case, is my only option is to purchase the 4243CBM module and have it programmed?
Cheers Jason