SMS Lite 4G
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User Guide
© 2022 QTech Data Systems Ltd
20
General Tips and Information
1.
The SMS Lite is over voltage protected by a 30-volt Zenner diode. Voltages greater than this
will blow the internal 2A fast blow fuse. The supply voltage should be clean, continuous and
transient free.
2.
The reliability of all cellular products is dependent on good signal strength. Before deciding
on the Telco to choose, please check coverage. We suggest that a cellular phone is taken to
site, to check the signal strength, i.e. how many “bars” are displayed.
3.
The supplied stub antenna (P/N PD9230) should be suitable for locations with good cellular
coverage (full bars) and where the SMS Lite is in a non-conductive enclosure (e.g., plastic).
Other external mounting antenna options are also available; contact your equipment
supplier or QTech Data Systems Ltd for more details.
4.
SMS messages on this device are limited to 160 Characters to provide compatibility with
older GSM services. There may be occasions when messages are truncated due to this
limitation. To avoid this set and check the debounce time before assigning phones to inputs.
5.
If there are no phones explicitly programmed for an input (see configuration overview) then
when the input changes state the notification is sent to all phones in the phone book in the
order PH1 to PH4 (whichever have a phone number associated).
6.
Upgrading from the old 2.5G SMS Lite. Take care when transferring the old SIM card to the
new 4G SMS Lite. If the new 4G SMS Lite fails to register on the mobile network, shown by
error code 4, you may need to obtain a new SIM card compatible with the 4G network. The
modem type is identified by the following printing on the daughterboard:
“UC864
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G”
2.5-3G mobile networks, obsolete, not manufactured
“HE910” or “HX910”
3G mobile networks, still in service, not manufactured
“LE910”
4G mobile networks, in service, current production