Option 2 - PNP
Transistor-driven switch which presents a pull-down resistor to GND on the alarm pin.
This configuration is the same for both alarm pins (pin-2 and pin-4).
Simplified Diagram of NPN output
Logic Table
Alarm True = Hi
Start State
Solid Green
Flashing Red
Solid Red
White
Hi
Lo
Hi
Hi
Black
Hi
Lo
Lo
Hi
Alarm True = Lo
Start State
Solid Green
Flashing Red
Solid Red
White
Hi
Hi
Lo
Lo
Black
Hi
Hi
Hi
Lo
Note:
On unit power-ip, both alarm pins remain in Hi state for up to 60 seconds before
these are used as alarm pins.
16
Note:
When ‘a’ is closed, ‘b’ is
open and vicaversa.
