Pulse Frequency Sensors Connection - NAVTELECOM SMART S-2423 Operation Manual

Note:
It is recommended to connect one of the universal input (usually UIN1) to the vehicle ignition line and make the
appropriate setting in the configuration. However, such connection is not mandatory.
In addition to the source of notifications about turning on and turning off events, the input is used in coordinate
processing algorithms (for example, when they are averaged at parking lots), energy saving, when calculating engine hours
and in some other device algorithms.
Any input which configured for operation with a discrete sensor can be used as an ignition.
Digital inputs are configured in the "Input lines" tab of the NTC Configurator program.
Сonnecting frequency or pulse sensors, it is necessary to consider how the output signal is generated in these
sensors. Further setting of the input depends on this.
It is necessary to set the threshold level of fixation correctly, in order the device correctly determine the frequency
or calculate the pulses.
Connecting pulse or frequency sensors, the output of which is implemented according to the "open collector" (OC)
circuit with pull-up resistor, it is not necessary to turn on the Pull-UP circuit in the device by the setting.
Figure 27. Connection of sensors with an "OC" type output circuit with a pull-up resistor in the sensor
When pulse flow meters with a reed sensor is connected, one contact of which is connected to the "ground", it is
necessary to include an internal pull-up resistor in the device setup.
14 13 12 11
7 6 5 4
Figure 26. Connection of the ignition lock and alarm button

2.4.3 Pulse frequency sensors connection

+U
R
p
Q2
10 9 8
3 2 1
VDD
R
pu
UIN
R
1
CPU_pull-up
CPU_adc
R
2
C
1