Example 8: Activating an Annunciator Panel
In this system application, a B1290 is used to report alarms from a number
of remote locations by turning the lamps of an annunciator panel on and
off.
Figure 6 shows a system where two remote sites are transmitting DTMF
codes to a central site. The Alarm On code associated with the remote
alarms is the same as the Relay On code at the central site. Similarly, the
Alarm Off codes at the remote locations are the same as the Relay Off codes
at the central site.
When a remote alarm occurs, the DTMF code for that alarm is transmitted
to the central site. On receiving this code, the central site activates the relay
associated with that alarm. When the alarm clears, the Off code is transmit-
ted from the remote, and the cental site’s associated relay is released.
Example 9: Concentrating Alarms from Remote Sites
In the following example, a number of remote sites report their alarms over
radio to a B1290, which concentrates the alarms and reports them over the
telephone.
Figure 7 is an example of two remote sites communicating with a central
site to have their alarms announced over the telephone. At the remote site,
the B1290s are programmed to operate over radio. They are programmed
with an alarm On output code and an Acknowledge Code. At the central
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Programming Examples
Figure 6 Activating an Annunciator Panel