INTERFACOM, S.A.
I3000100.DOC 13
7.- VEHICLES WITH ELECTRONICAL SPEEDOMETER
7.1.- INTRODUCTION
In the case of the vehicles equiped with electronical speedometer, the taximeter can
be connected to these sensors with a sealable adaptor, which ensures the fiability of
the system.
This equipment consists of one circuit which is inserted between the distance sensor of the
car and its speedometer. This circuit gets the signal which is sent by the distance sensor,
sends an identical signal to the speedometer and another signal to the taximeter according to
its input characteristics.
Usually the distance sensor is placed in the gearbox. In some cars, it can also be placed in
the transmission differential.
7.2.- INSTALLATION.
Before connecting the equipment to the car, you have to make the following:
Localize the distance sensor of the vehicle.
Identify the cables that connect this sensor to the car speedometer.
Search which of these cables corresponds to the ground, the power and the
distance signal in order to connect them correctly to the adapter.
Some cars have a cable which has a signal (oscillator) that the sensor uses
like a carrier to modulate it in amplitude.
See which kind of signal sends the sensor to the speedometer to configurate
the adapter jumpers in order it works correctly. Diagram 1 shows the
different signals that adapters can give.
Figure 1 shows the printed circuit of the adapter indicating the jumpers and
connections of the cables to the circuit.
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