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The TrueAlert controller gathers a roster of appliances on each of its TrueAlert
channels. This roster is then compared to the appliance download information
sent by the 4100/4020 Master. If any extra appliances are found, the “Extra
Appliance Trouble” status (one status report per TrueAlert Controller) is sent to
the 4100/4020. Any extra appliances reported are simply logged in the
4100/4020’s Trouble Log by the Master (similar to MAPNET operation). Once
the extra appliance trouble has been reported, it is cleared when the trouble is
fixed. Any missing or wrong appliances are also reported at this point (and at
any time they change state) as individual troubles in the system. Although only
one ‘extra appliance’ trouble will be reported per TrueAlert controller, each
extra appliance reported will be logged as such (similar to MAPNET extra
appliance operation).
Like all other card status points, the TrueAlert card statuses cannot be made
public on the 4120 Network. Card status troubles are all lumped together in the
Common Trouble Card Status count.
Only trouble status information is displayed for the appliances (the actual on/off
state of individual appliances is unknown to the 4100/4020 system). The
possible trouble messages are shown below:
• NO ANSWER (appliance missing)
• WRONG DEVICE
• SHORT CKT TROUBLE (Isolator only)
Individual TrueAlert appliances cannot be made public on the 4120 Network.
Therefore, individual appliance troubles are grouped into the 4100/4020
Common Trouble’s Miscellaneous Trouble count. Each TrueAlert appliance
that goes into trouble will increment the Common Trouble’s Miscellaneous
count. As the trouble clears, the Miscellaneous count will decrement.
Continued on next page
Operational Characteristics
Status Reporting
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