Hi Matt, the connections on the pyronix deltabell are as follows:
-12v = Hold off negative supply
+12v = Hold off Positive supply
BELL = To bell terminal on Panel
STB = To strobe terminal on Panel
ENG HOLD = Terminal to allow maintenace in Engineer mode (Would't worry too much about this)
T = Tamper Return to Panel
T = Tamper Feed (Link this terminal to the -12v terminal in bellbox)
Hope that helps (:-)
AJP
regards
ap
February 2011