QTech SMS Lite – Quick Start Guide V1.5 16
www.qtech.co.nz Ph: +64 3 366 3713 Page 16 of 21
Technical Details
Operating Voltage1: 12 – 24 Volts DC
Power Connector: 2.1mm DC Socket, centre pin positive
Operating Current: ~13mA @ 12V
~9mA @ 24V
Aerial2: 50Ohms, SMA connector
Inputs3: Electrically isolated, normally open inputs
Outputs4: Normally open relay contacts (2Amps @ 32V max)
Operating Conditions: 0 - 70C
90% humidity, non-condensing
Case Size: 112 x 75 x 25mm (Overall)
Weight: 255 grams (with supplied aerial)
Mounting Holes: 4x M4 mounting holes at ~102 x 50mm centres
RSM SCN: Z891
Modem specifications5: GSM/UMTS bands (MHz) 800/850, 900, 2100
To comply with the New Zealand and Australian wiring regulations the SMS Lite cannot be
connected to any external voltages exceeding 32 volts AC or DC. To connect to or control higher
voltage equipment please consult a Registered Electrician.
1. The SMS Lite is over voltage protected by a 30 volt Zenner diode. Voltages greater than this will
blow the internal 2amp fast blow fuse.
The supply voltage should be clean, continuous and transient free.
Warning – Do NOT use Switch Mode Power Supplies (SMPS) with this product. The DC power
supply used for this product MUST have a grounded negative or be a “linear” transformer based
plug pack. The reason is that the aerial, programming port and external connections can provide
exposed earth points and the SMPS can impose an AC voltage on the DC ground, which can lead
to damage. Suitable cost effective plug packs are available from QTech P/N PD5412, PD5413 &
PD5414.
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.
The supplied stub aerial (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 (plastic etc).
Other external mounting aerial options are available; contact your equipment supplier for more
details.
Warning – Do NOT operate the SMS Lite without an aerial connection.
3. Inputs are connected to suitable mechanical switches, contacts and other closure devices. An
input is active or ON when the input switch is closed and inactive or OFF when the input switch is
open.
Warning – Only mechanical switches or mechanical closure devices should be connected to
the inputs. No external voltage or other electrical source is to be connected to the inputs.
4. The relays are internally protected by solid state snubbers for operating with inductive loads.
5. Provides connectivity with all current New Zealand telecommunications companies (Spark,
Vodafone and 2 Degrees).