NAVTELECOM SMART S-2420, Руководство по эксплуатации

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or calculate the pulses.
The connection diagram or frequency sensors, the output of which is implemented according to the “open collector”
(OC) circuit with pull-up resistor is as follows:
CPU_adc
R
1
R
2
UIN
C
1
Q2
R
p
+U
Figure 23. 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 use an external pull-up resistor.
CPU_adc
R
1
R
2
UIN
C
1
2–10
кОм
+U
Figure 24. Connection of flow meter with a reed sensor
2.5 Built-in accelerometer
There are virtual sensors based on the built-in accelerometer (three-axis acceleration sensor): soft and strong impact
sensors, displacement sensor and tilt sensor in the device. They can be used for alerts as well as external lines.
Accelerometer is also involved in the coordinate averaging algorithm during stops, and the correct display of the track
depends on its settings. In addition to virtual sensors, accelerometer is used for such functions as EcoDriving. For proper
operation of these functions, the accelerometer must be calibrated after installing the device on the vehicle.
2.6 Control outputs connection
OUT1 and OUT2 open collector outputs are designed to control low-current loads up to 500 mA. When the output is
activated (turned on), it connects the external load to the "-" power supply (to the "ground").
The character of the controlling signal depending on the chosen mode can be permanent, signal or periodic.
Settings of the outputs are made in the “Output lines” tab of the NTC Configurator program.
One of the outputs can be used for control of sound signal emitting with help of the buzzer, for warning or EcoDriving
function indication.
Buzzers may be different in operating voltage, in the presence or absence of a built-in generator. A buzzer with a
built-in generator can emit a sound signal independently when a constant supply voltage is applied.
In order buzzer operates without built-in generator, supply voltage modulation is required.