Microtel D51T v.1.0 - Manual (Page 9)

MICROTEL D51T
7
How can I Make an Alarm Sound in the Vicinity of the Dialer?
The local summary alarm contacts will be de-energized (opened) whenever a fault
condition exists. This output could be connected to an interposing relay whose contacts
would be used to switch a siren or bell to warn the local area of the alarm condition.