26 Vehicle Equipment Installation Instructions
9 GPS Output Function
The Opticom™ GPS system utilizes information
from the constellation of GPS satellites. This data
may also be used by other devices that are
installed in an Opticom GPS equipped vehicle
This section provides details on the format of the
GPS data as well as details on how to connect to
the Opticom GPS equipped vehicle to obtain this
data.
Caution Notes
The Global Positioning System (GPS) is operated
by the United States government, which is solely
responsible for its accuracy and maintenance.
The system is subject to changes which could
affect the accuracy and performance of all GPS
equipment. Although the Opticom GPS system
uses a precise GPS receiver, any navigation
system can be misused or misinterpreted and
therefore become unsafe. It is the user’s
responsibility to use this position information
prudently. This information is intended to be
used only as a navigational aid and must not be
used for any purpose requiring precise
measurement of direction, distance, location or
topography. Use this product at your own risk.
To reduce the risk, carefully compare indications
from the GPS to all available navigation sources
including the information from any other
NAVAIDS, visual sightings, maps etc. For safety,
always resolve any discrepancies before
continuing navigation.
Format and data available
The Opticom GPS system will output serial GPS
data in the NMEA 1083, v2.0 or later format.
The following messages are provided:
GGA Global Positioning System Fix Data
GSA GPS DOP and active satellites
GSV Satellites in view
RMC Recommended Minimum Navigation
Information
Vehicle Connections and Configurations
This section describes the necessary connections
and configuration to obtain the available GPS
data from Opticom GPS vehicle equipment.
Connections
1. Connect the White/Orange (GPS
TXD -) wire of the Vehicle interface
harness to pin 2 on a DB-9 or DB-25
connector.
2. Connect the black (Ground) wire of
the Vehicle interface harness to pin 5
on a DB-9 or DB-25 connector.
3. Connect the DB-9 or DB-25
connector to the device that will
receive the GPS data.
Configuration
1. Open ITS Explorer and go the
Vehicle Configuration section.
2. Go to the General Configuration
section and select GPS Port from the
Communications Section.
3. Verify that the protocol is set to “GPS
Receiver NMEA Messages”
4. The sentences that are available will
depend on the baud rate that you
select in the communication section
of ITS Explorer.
a. 1200 Baud RMC only
b. 2400 Baud RMC, GGA and
GSA
c. 4800 Baud and higher RMC,
GGA, GSA, GSV
5. Press the “Write to Device” Button to
apply the changes to the vehicle
unit.
Notes:
1. The GPS data is only available when the
vehicle unit is fully powered and requesting
preemption/TSP. If you also need to have
GPS data available when not in preemption
/TSP mode See the Technical Bulletin
“Vehicle Connections and Configuration to
obtain GPS serial data for other Devices” for
details on how to make these connections.
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