Sierra Wireless AirLink MP890, User Manual

Page: 36 / 67

AirLink MP User Guide
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Power connector (Molex) pinouts
The pinouts for the Molex connector on the power harness are:
Figure 4-6: Pinouts for the power harness.
The battery (red) and ignition sense (white) wires in the power harness include
5 A fuses. The black ground wire is not fused. (See
Ground the power harness on
page 30.) Replacement power harnesses are available from Sierra Wireless.
Note: The battery cable used for a car, truck, or other mobile connection must be less than
3 meters in length.
Vehicle installation
This section applies to installing the MP modem in a vehicle. If you are installing it
in an office, see
Office installation on page 30.
Ignition sense on/off wiring
This section only applies to installing an MP modem in a vehicle. If you are
installing the MP modem in an office building, use the AC/DC adapter.
Note: Do not install an on/
off switch on the main (red)
battery line, or connect the
white ignition sense wire to
the red battery wire. Both
configurations bypass the
MP modem's controlled
shutdown sequence, and
may cause data loss and
subsequent power-on
problems. Incorrect wiring
may also drain the vehicle
battery. The MP modem’s power on/off is controlled by the ignition sense line (white wire)
using internal software, rather than a hard on/off switch on the red power line. The
red, black, and white wires connect to the battery and ignition switch as shown in
the power harness wiring diagram.
Note: The battery cable used for a car, truck, or other mobile connection must be less than
3 meters in length.
White wire
(Ignition sense)
Red wire
(Battery)
Unused
Black wire
(Ground)