NAVTELECOM SMART S-2433, Руководство по эксплуатации

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7
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6
12
5
11
4
10
3
9 8
2 1
«+»
«-»
Car battery
Fuse
(1А)
«GND»
Figure 19. Power connection
2.4 Universal inputs connection
2.4.1 Analog sensors connection
The device allows to measure the voltage applied to the inputs in the range of 0 ... 31 V.
When connecting analog FLS or other sensors for which the output voltage has to be monitored, the voltage
measurement profile must be set in the inputs setting. In this case, the function of adjustable averaging of measured values
and the setting of the threshold level for fixing the voltage measurement event become available.
CPU_adc
R
1
R
2
UIN
C
1
R
pu
CPU_pull-up
VDD
+U
Figure 20. Analog sensor’s connection
2.4.2 Discrete sensors connection
The device allows to connect any type of sensors that have two steady states: "on" ("activated") and "off" ("normal").
The voltage thresholds at which the device fixes the sensor on (activating) or off (switching to normal) depend on
the line profile setting and the set levels on the voltage scale. In order to operate with discrete sensors, the “Discrete NO
+”, “Discrete NC +”, “Discrete NO-”, “Discrete NC-” profiles must be specified in the settings.
“Discrete N3 -”, “Discrete NO-” allow to operate with sensors which close the input to "ground" ("-" power) when
they are turned on or off.
Note:
With these profiles voltage is applied to the input through the built-in pull-up resistor Rpu. This allows not to use an
external "pull-up" resistor when operating with sensors which operates on "-" (by "ground").