AlarmNet 7845C Manual de usuario descargar pdf (Pagina 25)

send this message. This may occur if the keypad wiring is cut or shorted, or if the control is no

longer functioning. A “Check” message may also display on the control panel’s keypad.

Loss of ECP

Supervision

Restore

Applies to the 7845C radio only when used with the 4229 zone expander module or when

programmed for 4204 emulation mode. When the radio has resumed communication with the

control panel, it will send this restore message.

Low signal

strength

This feature is currently not available.

Master-Host

Alarm

AlarmNet-M is configured redundantly with a Primary (account # 0000) and Secondary (account

# 0001) receiving system. Each consists of its own separate antenna system, a 7810R radio

transceiver, which is connected to a 685-5NR radio line card in its own 685 receiver. Both

receiving systems are live and powered up at all times, with messages normally sent to the

Primary system. If one system fails, the network will automatically route messages to the other.

At the time of such a failure, both a Master-Host Alarm and a Master-Host Reminder is

generated.

The Master-Host Alarm message is generate internally by the 685 that has failed. It indicates that

its particular receiving system is having a problem connecting to the network.

The Master-Host Reminder is generated by the network and is reported to the other, operating

receiving system. It indicates that the other part of the redundant system is having a problem

connecting to the network.

Example:

 During normal operation, all messages are being properly reported to the Primary receiving

system of a central station.

 A storm damages the antenna system to the Primary system, severing its connection to the

AlarmNet-M network.

 The 685 for the Primary receiving system will display the Master-Host Alarm, indicating that

it has lost network connection

 A few moments later, the Secondary system will display the Master-Host Reminder,

indicating that the Primary has lost network connection.

 The Secondary will immediately begin receiving all alarms and messages that normally

would have gone to the Primary

Such a condition may be caused by:

 Antenna failure

 Radio receiver failure

 Substantial interference

 Network outage



Master-Host

Reminder

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AlarmNet 7845C Manual de usuario Pagina 25