CONNECTING ALARMS
On the rear panel of the unit are four
•Unsupervised relay contacts are wired as either normally open or normally closed. Unsupervised modes are easily defeated and should not be used in critical situations when security is most important.
•Supervised mode activates an alarm if the current in a line falls outside a specified range. This blocks an attempt to defeat the alarm system by cutting a wire or through bypassing or shorting a section of the circuit.
Inputs are configured via a DIP switch mounted next to the connectors, as follows:
•If switch 1 (counting from the left) is up, then alarm mode is supervised.
•If switch 1 is down, then alarm mode is unsupervised (will be N.O. or N.C.).
•If switch 2 is up, then alarm mode is normally closed (N.C.).
•If switch 2 is down, then alarm mode is normally open (N.O.).
Switch 2 is irrelevant if switch 1 is
Pelco Manual | 19 |