If you followed my description of the wiring above (white to pin 2, blue to pin 3) it should work fine. That will make the Tx from the D8x connect to the Rx of the USR-232-302 and the Rx from the D8x connect to the Tx of the USR-232-302.
Did you use a NESS 450-246 cable and replace the RS232 female connector with a male RS232 plug?
I’m getting some zone data, Some zones not coming through, I can arm the alarm by entering code and selecting arm (ideally i would like to arm/disarm without the code if possible)
Disarm didnt seem to work yet but will try again when people arnt moving around