4
MAN #650398:B
Using an electric speedometer with the GPS-50-1.
The speedometer signal input should be connected to either SPEED 1 or SPEED 2 depending on the speedometer
requirements. If you are unsure of which to use, start with SPEED 1
and then switch to SPEED 2 if it doesn’t work. You
can test the speedometer connection by entering the speedometer output setup described below. While you are at the
speed cal selection, the output will provide a 60mph signal for testing.
If you are going to be connecting a cruise control to the GPS-50-1, the CRUISE terminal provides an ECM style speed
output signal. The output rate for this terminal is the same as for the SPEED terminals. It is not uncommon for the raw
GPS speed data to vary by as much as 6 MPH when going under a large bridge or other structure. While this unit does
use additional sensors to monitor and remove this, it may be possible to feel the cruise change slightly even though your
speedometer will not show a change.
Speedometer output setup.
Hold the switch beside the GPS-50-1 terminal strip while turning the key on. The display will show the current
revision code while this is held.
Release the switch. The display will show
“
”.
Press and release the switch until “
” is displayed.
Press the switch
and hold the switch until “
” is displayed.
Release the switch. The display will show the current speed pulse setting,
for 4000,
for 8000,
for 16000,
for 54400, or
for 128000. It will also drive the output with a 60mph (96 km/h) speed signal so you can
verify the reading on your speedometer.
Press and release the switch to change the setting.
Press and hold the switch until “
” is displayed to save the settings.
Turn the key off.
Setup Menu
set BIM ID
’s
,
enable or disable speed data on BIM
-
,
set clock ID
-
,
set compass ID
-
,
set altimeter ID
,
,
,
,
set or test the speedometer output calibration
GPS/accelerometer override settings
Lowest speed accelerometer override is allowed, default setting should be used
GPS > accel, default setting should be used
accel > GPS, default setting should be used
,
speed averaging update, default setting should be used
reset module orientation (relearn which direction is up and forward)
signal to noise ratio readings for trouble shooting and diagnostics
xx
highest signal reading
xx
lowest signal reading
xx-
average signal reading
xx
number of satellites being used
exit setup
Cruise control operation with the GPS-50-1
While a transmission or wheel based speed signal is ideal for operating a cruise control, the GPS-50-1 can be used when
this is not available. Special care must be taken in selecting the mounting location for the GPS-50-1 so that it can get a
clear view of the satellites. The difference in mounting locations is not noticeable for a speedometer, but can affect the
precision operation of a cruise control system. Try to locate the GPS-50-1 as high as possible. It can be under a
fiberglass or wood dash or in a headliner. Avoid having the unit surrounded by steel.
The
setup menu will aid in selecting an acceptable mounting location. This should be done in a clear, outside area
and not inside a building. Hold the switch beside the GPS-50-1 terminal strip while turning the key on. The display will
show the current revision code while this is held. Release the switch.
Press and release the switch until “
” is
displayed. Press
and hold the switch until “ - ” is displayed. Press and release the switch until “
” is displayed. It should
be tracking at least 6 satellites. If it is less than this wait a few minutes for it pick up additional satellites. Press and
release the switch until “
” is displayed. The maximum signal strength will be displayed in real time. You should try
different locations to obtain a reading of
or higher.
