17
Figure 9 I-Button DS1990A connection scheme
Fuel Tank sensors
A fuel tank level sensor exists in most cars, which shows the
approximate fuel level in the driver’s indicator panel. It is possible to
connect FM1110 Analog input to it (if sensor returns analogue signal
proportional to fuel level). Figure 10 shows the connection scheme to
the FM1110 and fuel tank sensor. After the connection to the tank fuel
level sensor, calibration is needed. Calibration is needed because most
fuel tank sensors are not linear. Calibration is performed by measuring
voltage dependence on volume of fuel in tank.
Alarm buttons, door sensors, etc.
Alarm buttons, door sensors, ignition, etc. return two states: high or low voltage. Digital
inputs are used to read this information. Figure below shows how to connect alarm button, door
sensor, etc.
Figure 11 Panic button connection
In cases when sensor output signal is negative, an additional relay has to be installed to
convert negative signal to positive.
Figure 10 Fuel sensor scheme
Downloaded from
www.Manualslib.com
manuals search engine
