Vehicle Equipment Installation Instructions
20
5.5.3 Low Priority
When Opticom™ GPS vehicle equipment ships
from the factory, the priority level (High or Low) is
preset. The user cannot change this priority level.
However, a high priority vehicle may be set to
temporarily be a low priority vehicle. This feature
is useful for traffic department maintenance
vehicles that maintain Opticom GPS intersection
equipment where both high and low priority
vehicles operate.
Low Priority Connections:
The vehicle interface harness contains a brown
wire that when connected to +12 VDC will cause
the vehicle unit to temporarily broadcast that it is
a low priority vehicle (see Table 5-3).
1. Connect the brown wire to one side of a
switch (not provided) and connect the other
side to +12 VDC.
2. Install an in-line fuse holder with a 2A, 250V
fuse (not provided).
3. When you activate the switch, the vehicle
will be a low priority vehicle until the switch
is deactivated.
Do not connect the Brown wire if you
do not want to use the mode
described above.
This action may be observed using the Vehicles
Heard section of ITS Explorer. Refer to the GPS
Vehicle Configuration section of the Opticom™
GPS System Operation Manual.
5.5.4 Probe Priority/GPS always out
The user has the option of activating the Opticom
GPS vehicle unit in a mode that will allow the
vehicle to transmit its position information and
output GPS data via a com port without
requesting TSP/preemption. This is done by
connecting the gray wire to +12VDC.
When +12 VDC is applied to the Gray wire, the
vehicle equipment will broadcast that it is in
Probe priority (will not request TSP/preempt).
Then one of the communication ports may be
configured to output GPS data in the NMEA
format. This data may be sent to other onboard
devices or computers to display the vehicles
current position speed and heading.
Notes:
1. See the Technical Bulletin “Vehicle
Connections and Configuration to obtain GPS
serial data for other Devices” or section 9 of
this document for details on how to make
these connections.
Do not connect the Gray wire if you
do not want to use the mode described
above.
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