There were two versions of the Raytheon BST hardware, although each appeared in several shapes !
The early analogue version has an on board pot, and the OEM PCB has a card edge connector at the far end does not AFAIK do RS232.
The later digital version (no pot, OEM PCB with pinned header both ends) has the RS-232/485 connection and functionality.
The RS-232/485 is on both connectors of the OEM PCB, so the Cadillac PCB must have RS232 somewhere too.
I have pictures of each OEM PCB type on Fire-TICS
http://www.fire-tics.co.uk/spares.htmThe Control-IR software can also do the recalibration in 'Cadillac' 320x120 mode. See step 2.4 in the 12142104.pdf document posted above where there is an option button.
I have not tried but it might allow a Cadillac electronics set to be converted into a 320x240 standard camera, but that would likely need the different chopper wheel and maybe a different lens. Possible however that the Cadillac PCB build had reduced memory for the half size image.
Bill