Sierra Wireless MP 700 Series User manual

MP 700 Series GPS
Rugged Wireless Modem
Vehicle Installation Guide
2130286
Rev 3.0

About This Template
Rev 3.0 Oct.04 3
Important Notice Due to the nature of wireless communications, transmission
and reception of data can never be guaranteed. Data may be
delayed, corrupted (i.e., have errors) or be totally lost.
Although significant delays or losses of data are rare when
wireless devices such as the Sierra Wireless modem are used in
a normal manner with a well-constructed network, the Sierra
Wireless modem should not be used in situations where failure
to transmit or receive data could result in damage of any kind
to the user or any other party, including but not limited to
personal injury, death, or loss of property. Sierra Wireless,
accepts no responsibility for damages of any kind resulting
from delays or errors in data transmitted or received using the
Sierra Wireless modem, or for failure of the Sierra Wireless
modem to transmit or receive such data.
If you have purchased this product under a United States
Government contract, it shall be subject to restrictions as set
forth in subparagraph (c)(1)(ii) of Defense Federal Acquisitions
Regulations (DFARs) Section 252.227-7013 for Department of
Defense contracts, and as set forth in Federal Acquisitions
Regulations (FARs) Section 52.227-19 for civilian agency
contracts or any successor regulations. If further government
regulations apply, it is your responsibility to ensure
compliance with such regulations.
Safety and Hazards Do not operate the Sierra Wireless modem in areas where
blasting is in progress, where explosive atmospheres may be
present, near medical equipment, near life support equipment,
or any equipment which may be susceptible to any form of
radio interference. In such areas, the Sierra Wireless modem
MUST BE POWERED OFF. The Sierra Wireless modem can
transmit signals that could interfere with this equipment.
Do not operate the Sierra Wireless modem in any aircraft,
whether the aircraft is on the ground or in flight. In aircraft, the
Sierra Wireless modem MUST BE POWERED OFF. When
operating, the Sierra Wireless modem can transmit signals that
could interfere with various onboard systems.
Note: Some airlines may permit the use of cellular phones while the
aircraft is on the ground and the door is open. Sierra Wireless
modems may be used at this time.
The driver or operator of any vehicle should not operate a
computer or any other device connected to the Sierra Wireless
modem while in control of a vehicle. Doing so will detract

MP 700 Series GPS Vehicle Installation Guide
42130286
from the driver or operator's control and operation of that
vehicle. In some states and provinces, operating such commu-
nications devices while in control of a vehicle is an offence.
Limitation of
Liability
The information in this manual is subject to change without
notice and does not represent a commitment on the part of
Sierra Wireless. SIERRA WIRELESS AND ITS AFFILIATES
SPECIFICALLY DISCLAIM LIABILITY FOR ANY AND ALL
DIRECT, INDIRECT, SPECIAL, GENERAL, INCIDENTAL,
CONSEQUENTIAL, PUNITIVE OR EXEMPLARY DAMAGES
INCLUDING, BUT NOT LIMITED TO, LOSS OF PROFITS OR
REVENUE OR ANTICIPATED PROFITS OR REVENUE
ARISING OUT OF THE USE OR INABILITY TO USE ANY
SIERRA WIRELESS PRODUCT, EVEN IF SIERRA WIRELESS
AND/OR ITS AFFILIATES HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES OR THEY ARE
FORESEEABLE OR FOR CLAIMS BY ANY THIRD PARTY.
Notwithstanding the foregoing, in no event shall Sierra
Wireless and/or its affiliates aggregate liability arising under or
in connection with the Sierra Wireless product, regardless of
the number of events, occurrences, or claims giving rise to
liability, be in excess of the price paid by the purchaser for the
Sierra Wireless product.
Patents Portions of this product are covered by some or all of the
following US patents:
5,515,013 5,617,106 5,629,960 5,682,602 5,748,449
5,845,216 5,847,553 5,878,234 5,890,057 5,929,815
6,169,884 6,191,741 6,199,168 6,327,154 6,339,405
6,359,591 6,400,336 6,643,501 6,516,204 6,561,851
6,653,979 6,697,030 6,712,627, 6.785,830 D367,062
D372,248 D372,701 D416,857 D442,170 D452,495
D452,496 D453,733 D459,303 D496,642 D496,655
and other patents pending.
Manufactured or sold by Sierra Wireless or its licensees under
one or more patents licensed from InterDigital Group.
Copyright © 2004 Sierra Wireless. All rights reserved.
Trademarks “Heart of the Wireless Machine” is a registered trademarks of
Sierra Wireless
Sierra Wireless, the Sierra Wireless logo, the red wave design,
and Watcher are trademarks of Sierra Wireless.

About This Template
Rev 3.0 Oct.04 5
Windows®is a registered trademark of Microsoft Corporation.
Other trademarks are the property of the respective owners.
Contact
Information
Your comments and suggestions on improving this documen-
tation are welcome and appreciated. Please e-mail your
feedback to [email protected]. Thank you.
Consult our website for up-to-date product descriptions,
documentation, application notes, firmware upgrades, trouble-
shooting tips, and press releases:
www.sierrawireless.com
Sales Desk: Phone: [phone]
Hours: 8:00am to 5:00pm Pacific Time
e-mail: [email protected]
Post: Sierra Wireless
13811 Wireless Way,
Richmond, BC
Canada V6V 3A4
Fax: [phone]
Web: www.sierrawireless.com

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Rev 3.0 Oct.04 7
Table of Contents
Introducing the MP 700 Series GPS Modem . . . . . . . . . . . . . . . . . . . . . . . . . . .11
System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Supported Platforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Package Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Modem Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Installing the MP 700 Series GPS Modem in a Vehicle . . . . . . . . . . . . . . . . . .15
Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Voice, GPS, and I/O Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
The Modem Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Connector Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Indicator Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Reset Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Required Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mounting the Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Selecting a Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Mounting Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Grounding the Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
GSM RF Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
GPS Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Antenna Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Installing Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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Power Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
The Power Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Power Connector (Molex) Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Ignition Sense On/Off Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Ignition Sense Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Power Harness Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Making Proper Power Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Correct Wire Splicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Using Crimp Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Powering On the Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Data and Voice Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Cable Connection to the Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Serial Connector (DB9) Pinouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Connecting the Serial or USB Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Voice Cable Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
I/O Port Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
I/O Connector (DB15) Pinouts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Panic Button Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Analog Sensor Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Inserting the SIM Card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Completing the Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Indicator Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
RF and Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Weight and Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
GPS Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
I/O Port Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Regulatory Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
European Union. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Declaration of Conformity for CE Marking . . . . . . . . . . . . . . . . . . . . . . . . . 35

Contents
Rev 3.0 Oct.04 9
Canada (Industry Canada Approval) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
U.S.A. (FCC Approval) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

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1
1: Introducing the
MP 700 Series GPS Modem
• Package Contents
• Warranty
The Sierra Wireless MP 700 Series GPS modem provides a
wireless network connection for portable computers installed
in vehicles. The modem has a rugged design that withstands
the vibration, shock, humidity, and extremes of temperature
experienced in the normal operation of police, emergency,
utility, and field service vehicles.
The network connection provided by the MP 700 Series GPS
can be used to access shared data, browse the Internet, and
send and receive e-mail and text messages. The modem also
allows for sensors, gauges, and alarms (such as panic buttons)
to be deployed in vehicles and remotely monitored from a
central location or dispatch. A built-in GPS module provides
location and heading data that can also be remotely monitored.

MP 700 Series GPS Vehicle Installation Guide
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System Requirements
Supported Platforms
Note: Do not connect the
MP 700 Series GPS to a USB
port on a PC before installing the
software. Software installation
instructions are provided in the
Software Installation, Configu-
ration, and Integration Guide
(document number 2130346) on
the installation CD.
The MP 700 Series GPS wireless modem connects to a personal
computer with either a serial cable or USB cable. Your
computer must therefore have either an available serial port or
USB port and an appropriate cable.
The Watcher software supports notebook computers with
these operating systems (using either a serial or USB PC
connection):
•Windows 2000 Professional (with Service Pack 4 or later)
•Windows XP Professional
These operating systems are also supported but require a serial
connection between the modem and PC:
•Microsoft®Windows®98 SE
•Windows NT 4.0 (with Service Pack 6a)
For detailed system requirements, see the MP 700 Series GPS
Software Installation, Configuration, and Integration Guide.
Package Contents
Each MP 700 Series GPS box contains:
•The MP 700 Series GPS modem
•A mounting template
•Mounting screws and washers
•An installation and documentation CD
•A power harness
If any of these materials are missing, please contact your
account manager at your reseller or at Sierra Wireless to obtain
them.
Documentation
The MP 700 Series GPS documentation consists of two guides
and an online help system.
The MP 700 Series GPS Vehicle Installation Guide (this
document) provides instructions on installing the hardware,
describing how to:
•Mount the modem in a vehicle.
•Connect to the vehicle’s battery.

About This Template
Rev 3.0 Oct.04 13
•Connect to the vehicle’s ignition switch or a separate on/off
switch.
•Ground the device.
•Connect the radio and GPS antennas.
•Connect a headset, a notebook computer, and other I/O
(input/output) devices.
The MP 700 Series GPS Software Installation, Configuration, and
Integration Guide describes how to:
•Install the software.
•Configure the software to use a GSM/GPRS account and
SIM (Subscriber Identity Module) card.
•Understand the LEDs on the modem and the indicators in
the Watcher software.
•Set up the modem’s operating mode and configure the
feature that allows for CSD connections.
•Configure the modem to report GPS and/or I/O (input/
output) data (from sensors, gauges, or panic buttons).
•Use the modem to connect to a VPN (Virtual Private
Network).
•Collect and use GPS and I/O data from a fleet of vehicles in
which MP 700 Series GPS modems are installed.
The Software Installation, Configuration, and Integration Guide
and the Vehicle Installation Guide are provided as PDF (Portable
Document Format) files on the installation CD.
Online help is provided with Watcher. The help describes all the
icons and indicators in Watcher, provides detailed instructions
on using Watcher to make voice and data connections, and
explains how to send and receive SMS messages. When using
Watcher, you can access help through the menu system or by
pressing the <F1> key.
Modem Accessories
For information about accessories for the MP 700 Series GPS
wireless modem—including cables and antennas—contact
your account manager at your reseller or at Sierra Wireless.
Warranty
Sierra Wireless warrants the MP 700 Series GPS modem
against all defects in materials and workmanship for a period
of three (3) years from the date of purchase.

MP 700 Series GPS Vehicle Installation Guide
14 2130286
The sole responsibility of Sierra Wireless under this warranty
is limited to either repair or, at the option of Sierra Wireless,
replacement of the radio modem. There are no expressed or
implied warranties, including those of fitness for a particular
purpose or merchantability, which extend beyond the face
hereof.
Sierra Wireless is not liable for any incidental or consequential
damages arising from the use, misuse, or installation of the
MP 700 Series GPS modem.
This warranty does not apply if the serial number label has
been removed, or if the wireless modem has been subjected to
physical abuse, improper installation, or modification.

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2
2: Installing the
MP 700 Series GPS Modem in a
Vehicle
• Installation Overview
• The Modem Housing
• Required Equipment
• Mounting the Modem
• Grounding the Modem
• Antennas
• Power Wiring
• Data and Voice Wiring
• Inserting the SIM Card
• Completing the
Installation
Note: The MP 700 Series GPS
is designed for negative-ground
vehicles only. It will not function
in a positive-ground vehicle.
Figure 2-1: Basic diagram for the installation of the MP 700 Series GPS in a
vehicle equipped with a notebook PC and a combination antenna, using the
car battery for power and ignition-sense wiring for power on/off.
Installation Overview
Note: All electrical installations
are potentially dangerous, and
should be performed by
personnel with thorough training
in safe electrical wiring proce-
dures for vehicles.
The installation process for the MP 700 Series GPS varies
depending on how you plan to use it, where it best fits in your
vehicle, and which of its features you plan to use. In all cases,
however, you must:
1. Mount the modem (“Mounting the Modem” on page 19).
2. Mount the GSM RF (Radio Frequency) antenna and
connect the antenna cable (“Antennas” on page 21).
3. Install the power harness (“Power Wiring” on page 23).
GSM/GPS
Antenna
MP 700

MP 700 Series GPS Vehicle Installation Guide
16 2130286
4. Install the serial or USB cable for the PC. (This should not
be connected to the PC until the software is installed. See
“Cable Connection to the Computer” on page 26)
5. Insert the SIM card (“Inserting the SIM Card” on page 29)
Voice, GPS, and I/O Options
The MP 700 Series GPS wireless modem provides support for
GPS (Global Positioning System) and input/output devices.
You can also enable the voice features on the modem (if your
service provider supports voice) and use the
MP 700 Series GPS as a mobile phone.
Voice. If the modem is to be used for voice communication,
you must connect a headset or other voice input/output device
that uses a 4-wire, 2.5 mm headset connector.
GPS. If you plan to use the MP 700 Series GPS’s built-in GPS
module, you must connect a GPS antenna and an antenna
cable, or use a combination antenna that can connect to both
the GPS and GSM RF connectors on the MP 700 Series GPS
housing.
Other I/O devices. Other devices, such as panic buttons,
sensors, or gauges may also be installed with the
MP 700 Series GPS and connected with an I/O cable to the I/O
port. (See “I/O Port Connections” on page 28.)
The Modem Housing
The MP 700 Series GPS has a rectangular metal housing:
Figure 2-2: Top view of the MP 700 Series GPS.
There is a connector panel on one end of the housing, an
indicator panel on the opposite end, a reset button on top, and
mounting holes along the bottom edges on either side.

About This Template
Rev 3.0 Oct.04 17
Connector Panel
The MP 700 Series GPS modem’s connector panel has these
ports:
Figure 2-3: The connector panel of the MP 700 Series GPS modem.
Indicator Panel
The MP 700 Series GPS’s indicator panel includes four
indicator lights and the SIM card slot, which is protected by a
removable rubber cover:
Figure 2-4: The indicator panel of the MP 700 Series GPS modem.
(4-wire, 2.5 mm)
Audio connector GSM/GPRS
(female TNC)
RF antenna
RS232 serial
(female DB9)
GPS antenna
(female SMA)
I/O connector
(female DB15)
Power harness
(Molex connector)
Ground screw
USB
(Type B)
Receive (Rx)
Power
Transmit (Tx)
GPS
SIM slot

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18 2130286
Reset Button
The reset button for the
MP 700 Series GPS is on the top of
the housing. Hold it down for at
least 2 seconds with a pen or screw-
driver to perform a hard reset of the
modem, which includes a self-test
sequence.
Figure 2-5: The modem reset button.
Required Equipment
To install the MP 700 Series GPS, you require the modem, the
provided power harness (or existing MP200 Series power
harness) and mounting template, and the screws and washers
that come with the device. You also require:
•ASIM card The SIM card is a postage stamp–sized chip
that is obtained from your wireless service provider that
gives the MP 700 Series GPS a unique identity on the GSM
network. (See “Inserting the SIM Card” on page 29.)
•AUSB or 9-pin serial cable This must be long enough to
run from the mounting location of the MP 700 Series GPS
to the computer. The maximum length for the serial or
USB cable is 5.5 m (18 feet). The USB cable must have a
Type A male connector at the PC end and a Type B male
connector at the modem end.
Note: If GPS is being imple-
mented, you require either two
antennas or a combination GSM
and GPS antenna.
•A GSM RF antenna and cable The antenna must have the
appropriate regulatory approval, 50 ohm impedance, and
a male TNC connector. (This may be a hard-mount or
magnetic-mount antenna—see “Antennas” on page 21)
•A GPS antenna and cable (optional)—This is necessary if
you plan to use the built-in GPS module. (See “Antennas”
on page 21.)
•A power supply. This is usually the vehicle’s battery.
•Appropriate electrical grounding. If a ground wire is
necessary, use a 16-gauge wire and connect it to the
ground screw on the modem’s connector panel.
•An I/O cable (optional). This is required if a panic button,
sensor, gauge, or other I/O device is being installed. (See
“I/O Port Connections” on page 28.)

About This Template
Rev 3.0 Oct.04 19
Mounting the Modem
Note: The MP 700 Series GPS
modem, your computer, and any
other devices should be powered
off while you are connecting
cables.
The MP 700 Series GPS can be mounted in the trunk of the
vehicle, under the dashboard, or under a front or rear seat.
Selecting a Mounting Location
When selecting a mounting location, consider the following
factors:
•The modem should not be exposed to weather and
environmental conditions beyond the ranges listed in the
technical specifications on page 33. Avoid excessive heat
from the engine compartment, heaters, or the exhaust
system, and extreme cold from direct contact with air
conditioners or other cooling systems. Never immerse the
modem in water or any other liquid.
•If you are replacing an MP200 modem, the
MP 700 Series GPS is smaller, but can be mounted in the
same location using the existing mounting holes. The
MP200 has six mounting holes, and any four adjacent ones
will line up with those on the MP 700 Series GPS.
•Every device connected to the MP 700 Series GPS, as well
as the modem itself, should be grounded as appropriate
for the installation. (See “Grounding the Modem” on
page 20 and “Power Harness Grounding” on page 25.)
•Wiring and connections should be as simple as possible.
Cables for power, antennas, the computer, and any I/O
devices must be routed to their destinations without using
excess wiring.
•All connectors and the reset button should be easy to reach
and the indicator lights should be visible.
•The door to the MP 700 Series GPS modem’s SIM slot
should be easy to open and close, and should allow the
SIM card to be easily inserted and removed, especially if
the SIM card might be shared with another device (such as
a mobile phone). Avoid having to remove the
MP 700 Series GPS from its mounting simply to remove
the SIM card.
Mounting Procedure
To mount the MP 700 Series GPS:
1. Use the provided mounting template to mark the location
of the mounting holes.

MP 700 Series GPS Vehicle Installation Guide
20 2130286
2. Drill the required 5/32" pilot holes (unless you are reusing
holes from an MP200 modem mounting—see page 19).
3. Use the supplied mounting screws and washers to secure
the MP 700 Series GPS through the holes along the edge of
the case bottom.
Figure 2-6: The bottom of the MP 700 Series GPS housing. Arrows indicate
the mounting holes.
Grounding the Modem
Note: Failing to provide a
dedicated ground for each
piece of electrical equipment
can damage the equipment.
It is standard practice in automotive installations to provide a
good quality ground for each piece of electrical equipment. In
most cases, the modem should be grounded by connecting the
black ground wire of the power harness either to the vehicle
chassis or to the negative terminal of the battery.
Note: If you are replacing an
MP200 modem, you can use the
MP200 power harness rather
than installing the
MP 700 Series GPS power
harness. The only difference
between the harnesses is that
the MP200 harness has a fused
ground wire while the
MP 700 Series GPS harness
has an unfused ground wire.
If other devices connected to the modem (such as a notebook
computer) are not properly grounded, there is some risk that
the other device will ground itself through the cable
connecting it to the modem. This creates a hazardous situation
and could cause equipment damage. If you cannot properly
ground these devices, a potential solution is to install a fuse in
the ground return wire.
The power harness for the MP 700 Series GPS modem has 5 A
fuses on the red power wire and the white ignition sense wire,
but not on the black ground return wire. (See “Power Wiring”
on page 23.)
To facilitate other ground schemes, a ground screw is provided
on the connector panel of the MP 700 Series GPS. Use of this
ground screw is not required as long as the power harness is
properly grounded. (Use a 16-gauge wire if you choose to use
the ground screw.)