1.5 Connector details

The circuit board connections are defined as...

IDC Pin	Function	Type
1	Ground	Power
2	Ground	Power
3	Zone #1	Input
4	+5 volt	Power
5	Zone #3	Input
6	Zone #2	Input
7	Zone #5	Input
8	Zone #4	Input
9	Zone #7	Input
10	Zone #6	Input
11	Zone #9	Input
12	Zone #8	Input
13	Zone #11	Input
14	Zone #10	Input
15	Sound bomb	Output
16	Zone #12	Input
17	Stobe	Output
18	Siren	Output
19	+12 volt	Power
20	+12 volt	Power

Notes:-
Pin 4 passes the 5 volt supply through the GPIO connector, so can be used to provide power to the Raspberry Pi.
Pin 15 is designed to drive a Peizo Sound Bomb