IRIS-4 Technical Reference Manual.docx 12/01/2023 page 31
Best signal The technology with the highest signal strength will automatically be selected.
4G Locked to 4G only. Note: that if there is no 4G available, cellular communication will
not be possible.
4G preferred 4G is selected if available and above the set minimum signal strength. If there is no
4G available the terminal will revert to 3G or 2G, if available.
2G + 3G 4G will not be used. Note: that if there is no 2G or 3G available, cellular
communication will not be possible.
3G Locked to 3G only. Note: If there is no 3G available, cellular communication will not
be possible.
3G preferred 3G is selected if available and above the set minimum signal strength. If there is no
3G available the terminal will revert to 2G, if available
2G Locked to 2G only. Note: If there is no 2G available, cellular communication will not
be possible.
2G preferred 2G is selected if available and above the set minimum signal strength.
Enhanced roaming This option enables an enhanced roaming feature when used with a roaming SIM. A
standard roaming SIM will always attach to the preferred provider even if this has
the weakest signal. Enabling this option forces the cellular attachment to connect to
the strongest signal identified by the terminal.
6.8 Battery backup:
For terminals with battery backup, the menu ‘Battery backup’ will be shown.
Tick the box to automatically use the battery backup when needed.
The sense input can be used to prevent the terminal taking power from an
external source. For example, if power is taken from an external alarm panel
that is itself battery backed, this input can be connected to the DC input of the panel that has been derived
from mains power and prevent the terminal taking power from the panel’s own battery.
This screen also shows faults with the battery backup (main fail, batteries need replacing or low battery
charge), if present
6.9 Panel interface
The range of panel interface options differ for the different products series:
160:
2xx series:
4XX series:
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