Teltonika FM4200 User Manual page 14

Impulse counters
Figure describes the connection scheme to the FM4200. Here two pulse meters are
used, where one is mounted on the direct flow valve and the other on the return flow valve.
Data from both meters is sent to the FM4200. Then FM4200 calculates DIN3-DIN4.
Resulting difference equals to fuel consumption. Filter should be used on the direct flow
pipe to prevent any damage caused by impurities in the liquid. The filter mounted in the
meter inlet is only a safety filter and it is too small to act as a strainer.
Alarm buttons, door sensors, etc
Alarm buttons, door sensors, ignition, etc return two states: high or low voltage.
Digital inputs should be used to read this information. Figure below shows how to connect
alarm button, door sensor, etc.
In cases when sensor output signal is negative an additional relay has to be installed to
convert negative signal to positive.
6 Figure Pulse fuel meters connection scheme
7 Figure Panic button connection
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