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25 — Alarms
Procedure 25-8 To log alarms locally
1
2
25.7
External alarms
The external alarm function allows you to monitor or activate external alarm devices.
It is disabled by default.
When the function is enabled and a monitored device signals an external alarm, an
External Alarm Raised alarm is added to an alarm queue. The function can be
disabled while External Alarm Raised alarms are listed in an alarm queue.
Connections are made through the Alarm connector (RJ11-type). See chapter 9 in
Installation for information on connecting external alarm devices.
Monitoring a device
To detect an external alarm, the 2902 MainStreet system monitors its Alarm In pins
for a change of state. You can configure the external alarm function to assume the
Alarm In contacts are normally open or closed. The default setting is normally
closed.
Activating a device
If there is an unacknowledged alarm in the major alarm queue, the Event Status LED
lights. If an alarm device is properly connected to the external alarm connector and
the external alarm function is enabled, the device is activated.
If a system problem exists, the System Status LED lights. If an alarm device is
properly connected to the external alarm connector and the external alarm function
is enabled, the device is activated. See section 24.2 for information on system
problems.
25-10
Connect a printer to a serial port and configure the serial port type for PRINTER.
Enter:
ALARMS — MORE — LOGGING
* Default
LCL_ON/LCL_OFF*
2902 MainStreet Technical Practices
90-2906-01
SK000533
May 2002
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