Speco EZVR4/8 User Manual page 15

Alarm Input
The Alarm Signal type depends upon the Alarm Sensor polarity defined as NO (Normal Open)
or NC (Normal Close).
Alarm Output:
Relay: NO + COM or NC + COM
Relay: NO (Normal open)
NO COM
Door closed
Alarm trigger
15
Door open
Relay: NC (Normal Close)
NC COM