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5.1.1 Supervision of Devices
The loop interface software continuously supervises the devices on its loop against those
found during configuration for the following conditions:
• Device missing.
• Unconfigured device responding.
• Two or more devices responding to the same address.
• Wrong device type.
A communication or addressing error on a device is reported as a trouble on the associated
zone LED as configured. The detectors may be configured as non-verified or verified alarm
inputs.
5.1.2 Device LEDs
• Polling the devices on the loop causes the device LED to flash normally.
• All device LEDs can be suppressed via the configurator. Suppressing the device LEDs
causes sounder or relay bases to not operate. For an unconfigured device, the LED will
be steadily red. For a device with a built-in isolator, the LED will be steadily yellow if the
isolator is activated.
• Activating devices on the loop (alarm for an input device, active for an output device)
illuminates the LED steadily red.
• The maximum number of active MGC addressable devices with their LED illuminated
steadily red is 40 for the loop.
5.1.3 Alarm Conditions
Alarm conditions are determined by interrupt which uses thresholds for alarm conditions
stored in the device.
MGC detectors (MIX-4000 series) send an interrupt request to the panel, indicating the Alarm
condition. The system is polling the interrupt group to determine the devices in Alarm. The
Alarm conditions are confirmed by device status flag and comparing reported value against
the threshold.
Devices can be individually configured with 2 separate thresholds, “day time” and one “night
time” or after hours operation; i.e. a device may be configured to a low sensitivity for “day time”
and high sensitivity at “night time”. The day time threshold will be used unless the after hours
operation is active. To configure threshold settings, Enable Auto After Hours must be selected
in the configurator.
Figure 8 MGC-400 Configurator Date and Time Settings
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