Old ADT scantronics board integration

Like many here, I’ve an ADT system, but mine is a 20 year old board Scantronics 50-3773. When the service tech came out to reprogram, he discovered he couldn’t because the output was in binary and his computer couldn’t read it.
I’ve read most of the ADT posts, but all for more modern boards with greater functionality. Before I go on a journey of self-enlightenment, I’m hoping there is someone in the community that can provide some direction.
For example, since the keypad displays open zones even when not armed, can I simply steal the data stream for a trigger, translate and pass to ST as an input? [Arduino/RasPi even] Or, is wiring each zone to a ST sensor the only path?