Determine the Signal Strength and Select a Location
The IGSMHS must be mounted indoors within the protected premises. When choosing a
suitable mounting location, understand that signal strength is very important for proper
operation. For most installations using the supplied antenna, mounting the unit as high as
practical, and avoiding large metal components provides adequate signal strength for proper
You will use the communications module to determine signal strength in order to find a
suitable mounting location.
NOTE: If the SIM is already activated, the RSSI signal strength indicators will indicate
If the SIM has not been activated, the firmware in the communications module enables it
to communicate with the cellular network towers (without the SIM being activated) so
that signal strength measurements can be determined. In this case, you can display the
signal strength by simultaneously pressing the MODE and TAMPER switches.
Warning – The antenna(s) used for this transmitter must be installed to provide a
separation distance of at least 20 cm from all persons and must not be collocated or
operating in conjunction with any other antenna or transmitter.
NOTE: The IGSMHS must be installed in accordance with the National Fire Alarm Code,
ANSI / NFPA 70.
1. Unpack the IGSMHS and detach the case back by pushing up into the two tabs located at
the bottom of the IGSMHS with the blade of a screwdriver while pulling the case back
and case front apart.
2. Temporarily connect the IGSMHS to the AC transformer, supplied.
3. Choose the installation site with the best signal strength by observing the signal
strength (RSSI) bar graph (refer to Appendix A for information about signal strength and
status indications). Signal strength should be within 3-5 bars. The best signal strength
is usually found at the highest point in the building, near a window. Unplug the
4. Mark the location for the IGSMHS.
Unshielded, 22 AWG cable is recommended for IGSMHS power / data wires.
Mounting and Wiring
3 BARS MIN.
S E C T I O N