SUNDING Bicycle Computer SD-548A

Using and setting up the SUNDING SD-548A Bicycle geputerSetup:

The first
task in installing the system is to mount the sensor on the front fork.
The user may use either the left or the right fork. The black magnetic
cylinder mounts on one of the spokes of the front tire. Mount this
toward the rim of the tire placing the notch around the spoke and
tightening it slightly to start with using the supplied screw. The
sensor will be mounted on the inside of the fork The user should wrap
the sensor wire around the front stem and fork being careful that the
wire has enough play so that the handlebars will rotate without
tightening the wire and in such a way that the wire is not in the way
of any brakes. Rotate the rim with the sensor until the magnet assembly
is directly in line with the fork. Place the pickup sensor in such a
position moving it up or down so that the distance between the magnet
and the sensor is 1 millimeter or less. This distance is very small.
Roughly 1/32 of an inch. The magnet should not touch the sensor as it
rotates. But it must not be so far away that it is not able to generate
enough magnetic pull that the sensor cannot generate a signal for the
geputer display. Once you have established a good location tighten
your magnet more firmly and tighten the magnetic pickup sensor using
cable ties. After tightening the ties, you should rotate your tire
observing to see if the display shows the current speed. If the
magnetic pull between the supplied magnet and sensor is too weak, a
signal will not be generated for the geputer. You may have to adjust
the position of the sensor, the position of the magnet, or both to
bring them closer together to achieve a dependable signal.

Once a dependable signal has been detected by observing the display,
mount the geputer display on the handlebars using the cable ties.

At this point, the user is ready to program the geputer to match the
peculiar characteristics of his own bike and locale. Usually the
geputer gees with the battery already installed, so the user will
just have to hold down both buttons simultaneously while in the
odometer mode (ODO) to start the setup process. To put the geputer in
ODO mode repeatedly press the right button until the ODO letters appear
on the left side. Once you see the ODO letters, stop. Press both the
right and left buttons simultaneously until you see the bottom four
digits flashing. This is where you'll enter the circumference of your
tire using millimeters.

To calculate the circumference of your tire you use the following mathematical formula: Circumference = Pi * Diameter
Thus if the diameter of your wheel is 27", the circumference would be
3.14159 * 27" or roughly 84.8230. If you're wondering, the mathematical
value of Pi is 3.1415926535897932384626433832795. But there's really no
need--unless you're an astronaut--to use all those digits. And since
the geputer requires using a metric measurement, you must convert
inches to millimeters if you're in the United States. Use the following formula to convert inches to
millimeters: Inches * 25.4 = millimeters.

Thus, using the example above of having a bicycle wheel of 27" you
would plug in the following values: 84.8230 * 25.4 or 2155 millimeters.
You may have to round up or round down. A simpler more direct way and
more accurate method is to use the bike wheel itself and measure the
distance traveled in one geplete rotation.

To do this you should hold bike with the air nozzle at the direct bottom position.
Mark that spot with a marker of some kind. Roll the bike forward in a
perfectly straight line until the air nozzle is once again in the same
position at direct bottom. Mark that spot, also. The measure of that
distance between these two spots should be your circumference. This method should provide the most
accurate reading to enter into your geputer.

But assuming you have the circumference calculated correctly hold down
both buttons as described previously until you only see the four digits
on the bottom. These are the four digits that will be used to calculate
speed and distance. The rightmost digit should be flashing. Press the
right button to change its value. When satisfied press the left button
to move to next value to the left.

Keep on changing these digits until they match your desired values.
Again, use the right button to change a value. Use the left button to
move to the next value. This principle will continue to be used
throughout the remainder of the setup. Use the right button to change a
value. Use the left button to move to the next value.

After setting up the last digit, press the left button and you will be
presented the option to choose either the American or Metric system for
distance. M stands for Miles. KM stands for kilometers. You
next setup the maintenance mode. You have four choices: 200, 400, 600,
or 800. The last zero appears smaller than the first. Use the right
button to change the value or the left button to proceed to the next
step.

After accepting the value by pressing the left button, the geputer
should switch to the time display. And you're done with setting up the
initial values that will be used to calculate distance and speed.

To set the correct time, the setup procedure is somewhat different than
the method used in setting up the distance parameters. Press the right
button repeatedly until the clock mode information appears along the
bottom of the display. You should go through the Scan mode, Odometer
(ODO) mode, Distance (DST) mode, Maximum Speed (MXS), and Average speed
(AVS ), a TM mode, Temperature mode, a DST mode again, Average speed
(AVS), and finally the clock mode. Press the right button until the
clock mode appears. You should see the time along the bottom row
showing A or P with the time or just the time with no indication of
either AM or PM.

Once it appears, hold down the left button for three seconds. You
should see a flashing 12Hr or 24Hr symbol. But use the left button this
time to change the value and the right button to change to the next
setting. Pressing the left button will alternate between 12 and 24 Hr
mode. Pressing the right button will move to the next step in the time
setup. When the hours flash, use the left button to change the value.
Use the right button when satisfied to move to the minutes. The minutes
should flash. Use the left button to change that value. Use the right
button to accept the minutes value. And that should geplete the setup
for time.

You may also change the locale for Fahrenheit or Celsius. Cycle through
the modes using the right button until the temperature displays. At
this point hold down the left button until the C or the F starts to
flash. Press the right button to alternate between Celsius or
Fahrenheit mode. Press the left button when you're satisfied that you
have the setting that matches your locale. The following is a short review of the SD-548A bicycle geputer.