CM910 Cellular Modem– User Guide
© 2020 QTech Data Systems Ltd
5
Installation
Antenna Connection
Carefully connect the antenna. Do not operate the CM910 without an antenna connected. Refer to
Technical Details section for alternatives. The antenna must be vertically orientated.
The supplied stub antenna (P/N PD9230) should be suitable for locations with good cellular coverage
(full bars) and where the CM910 is in a non-conductive enclosure (plastic etc).
Other external mounting antenna options are available; contact your equipment supplier for more
details.
Warning – Do NOT operate the CM910 without an antenna connection.
Power Supply
The CM910 is over voltage protected by a 30 volt Zenner diode. Voltages greater than this will blow
the internal 500mA 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 as the antenna, 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.
Installing the SIM Card
Note
: 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.
Before installing the SIM card, ensure that it is activated. We recommend you insert the SIM into a
regular cell phone to check this. Carefully remove the CM910 cover by prising the side panels close
to the retaining dimples.
Locate the SIM card holder adjacent to the USB and RS232 connectors. Push the top part of the
holder in the direction of the “Open” arrows (away from the antenna). Carefully insert the SIM card
from your chosen Telco. Be careful to orientate the card correctly, once in place carefully slide the
plastic retainer towards the antenna to “Lock”.
Aerial must be
vertical if
mounted flat
Aerial must be
vertical when
wall mounted
Parallel
to wall
surface
Perpendicular
to flat surface
