Almost forgot, adding a please at the end does wonders.
Alarm
January 2011
First in each is the 9448, 2nd the defender.
STR-.............Strobe Trigger
Bell-..............Siren Trigger
12v...............Supply Hold Off
0v.................Supply Hold Off
TR.................RTN Signal
Then put a link between Com and -ve on the Defender.
Alarm
January 2011
I can answer this question...
How to connect a Defender Bell Box to a Scantronic 9448-90 panel?