[Replacing old bell box with Pyronix DeltaBELL plus]

Hello, 

Just  after some advice about changing an old bell box for a Pyromix DeltaBELL plus. The panel is a Optima XM panel (quite old) 

I am unsure of how many cores are going to the old bell as I am doing the job for a friend. I am an industrial electrician by trade so I have limited knowledge of alarms!

 

I have no manual for the new bell box but I am told there's 7 terminals. I'm due to go there this weekend so thought I'd do some homework before attempting it. Anyone on here have a diagram for this bell or any advice? I have the manual for the panel but not the new box.

 

Thank You!