The System Bus
i-on Range
Page 28
any alarms on zone 000. Cooper Security suggest that you might find this zone
useful as a Log Only zone.
Processing Priority
When several detectors are activated at the same time, the control unit always
processes HUA and Normal Alarm detectors first, followed by Fire, and then all
other alarm types. The control unit always processes alarms before Alerts.
Tampers and the Bus
Every device that can be attached to the bus has its own anti-tamper switch.
When this switch is triggered the device sends a message down the bus to the
control unit, which then starts the appropriate alarms, shows a tamper alert on
the keypad and communicates a tamper message to the ARC.
If a bus device is disabled, and cannot send any messages on the bus then the
control unit marks it as ―missing‖. (A bus device might be disabled by physical
damage, loss of power, or by a cut bus cable.) The control unit starts a tamper
alarm and displays an alert at the keypad, for example ―P1:Missing R1-03‖ for
an expander or ―P1:Missing K1-52‖ for a keypad. In a Grade 3 system the
control unit will also communicate a missing bus device to the ARC as a
tamper.
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