12
Editing MHI Databases
The text in the top left corner provides information about the database. The top line gives the
date and time the database was last edited. The next line states whether the current contents
have been verified or not; and whether the database has been compressed or not.
The options Bell System, Subsequent Alarm, Resound, Evac and Waterflow all affect how the
notification appliance circuits (NAC), hereafter referred to as bells, react to alarm conditions.
2.3.2 Bell System
Bell System is a drop down list for selecting how the bells and strobes will operate. This sets
the base operation for the entire network. If coded bells are required, the bell codes are
defined for each input individually. The following options are available:
• Alert: A First Stage alarm activates the selected bells in Alert mode. If the Signal Silence
or Automatic Alarm Signal Cancel Hot Key is not pressed before the [No Acknowledge]
Automatic Alarm Signal Cancel timeout, the panel will progress to Second Stage.
Second stage will activate all bells in Evacuation mode.
• Evac: A First Stage alarm will activate selected bells in Evacuation mode. Second Stage
will activate all bells in Evacuation mode. There is no timeout from First to Second Stage.
• Alert/Evac: A First Stage alarm activates the selected bells in Evacuation mode and all
other bells on the panel in Alert mode. If the Signal Silence or Automatic Alarm Signal
Cancel Hot Key is not pressed before the [No Acknowledge] Automatic Alarm Signal
Cancel timeout, the system will progress to Second Stage. Second Stage will activate all
bells in Evacuation mode.
Note: Not to be used for ULC applications.
• Staged: The 1st alarm will activate selected bells in Alert mode. If the Signal Silence or
Automatic Alarm Signal Cancel Hot Key is not pressed before the [No Acknowledge]
Automatic Alarm Signal Cancel timeout, the selected bells are switched to Evacuation
mode and the next bells, i.e. the ones with the next higher number, are activated in Alert
mode. This sequence is repeated until all bells are in Evacuation mode. When the
highest numbered bell circuit switches to Evacuation mode, all bell and strobe circuits on
the panel will be turned on in Evacuation mode. For example, if the alarm activates Bells
1 and 4, after the NAK timeout, Bells 1 and 4 are switched to Evacuation mode and Bells
2 and 5 are set to Alert mode. A 2nd alarm will activate all bells in Evacuation mode.
Note: Not to be used for ULC applications.
2.3.3 Subsequent Alarm
Subsequent Alarm controls how Alert, Evac and Alert/Evac type bell systems behave when a
new alarm is received while one is still active. 1st Stage has the panel repeat the First Stage
operation. 2nd Stage has the panel go immediately to Second Stage operation.
2.3.4 Resound
Resound controls how the panel handles the automatic resounding of silence bells when a
new alarm is received. There are two modes:
Note: Control modules cannot be programmed as bell or strobe if the Staged Bell
system is used.
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