NMX920 OEM Integrators Guide
Page 5 of 21
4. Interface Notes
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Permanent damage can occur to the NMX920 if operated without a properly
connected 50-ohm antenna and cable (eg. RG-174). Care should be taken to ensure
that the antenna and cable are correctly matched to the NMX920.
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NMX920 must be properly subscribed with the approved MOBITEX Network
Operator in the country of intended operation before use. Care should be taken not to
operate an unregistered NMX920.
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When power is applied to the NMX920 power pins it will enter
POWER-OFF MODE
(see section 6 below) waiting to sense a “power on request” via the correct assertion
of
DTR
pins (see section 6
below).
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When operated for the first time, via the correct assertion of the
DTR
pin (see section
6 below), the NMX920 may take several minutes as it attempts to become BORN on
its’ registered MOBITEX Network. Once BORN, the NMX920 will enter its default
mode, Battery Save or Express, as programmed at time of manufacture. The Mode
may be changed by the relevant MASC command.
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NMX920 should always be operated as described in this document, special attention
should be given to power handling detailed in section 6.
