FMA120 Accessories

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Bw nb.png Please order accessories separately as they are not included into device package.

Accessory and its description Accessory connection schematic
Fuel tank sensors Fuel sensor connection to FMA120
A fuel tank level sensor which indicates the approximate fuel level on the driver's indicator panel exists in most cars. If the sensor returns analogue signal proportional to fuel level it can be connected to FMA120 Analog input. After connection to the tank fuel level sensor a calibration is needed because most fuel tank sensors are not linear. Calibration is performed by measuring voltage values resulting from the volume of fuel in tank.
Sch fma120 lls.png
Alarm buttons, door sensors etc. Panic button connection to FMA120
Alarm buttons, door sensors, ignition, etc. have two output states: high or low. FMA120 Digital inputs are used to detect these states.
Sch fma1yx panic.png
Relays Inverting relay connection to FMA120
In cases when sensor output signal is negative, an additional relay has to be installed to convert negative signal to positive.
Sch fma1yx inv relay.png
Immobilizer relay Immobilizer relay connection to FMA120 output
When connected as shown on the right hand side, FMA120 disables engine starter when output is ON.
Sch fmb1yx imb relay.png
Automotive relay Automotive relay pinout
An ordinary automotive relay is used to invert input signal or to immobilize engine starter. Note that relays can be 12 V or 24 V capable.
Pic relay.png
Sch ord relay.png
1-Wire devices Digital thermometer DS1820 and TTJ100 connection to FMA120
One of the implemented features on FMA120 is 1-Wire® data protocol, which enables connection to devices such as thermometer (DS1820, DS18S20 and DS18B20) and I-Button types: DS1990, DS1991, DS1994, DS1993, DS1992, DS1982, DS1995, DS1985, DS1996, DS1986, DS1971, DS1963L, DS1921, DS1973, DS1904, DS1972, DS1977, DS2413, DS1922/1923, DS1990A, DS1982U, DS1985U, DS1986U.
Sch fma120 ds1820.png
TTJ sensor pinout
FMA Ttj pinout.png
I-Button DS1990A connection to FMA120
Sch fma1yx ibutton.png