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4.1 Direct Connection miniDaqu — Manual
D
PNP
C
1
2
1
+
-
BAT
V
GND 3
+5 V 4
AUX 5
6 F
1
F
2
FUEL
P
E
2
7 FL
2
GND 8
E
1
9 FL
1
Y
1
10 ROTOR
GND
+12 V 11
12
2.
2k
Figure 11: An example of PNP digital sensor connection.
The alarm signal uses two pins. When active, the positive alarm pin provides
system voltage (usually 12 V) and the negative pin connects to ground. These
pins can be used directly or indirectly.
See Figure 3 and Table 3 for ECU connector pin description.
4.1 Direct Connection
The direct connection of some load (e.g. warning light) to alarm pins is limited
to 150 mA current. When load requirements are higher, the indirect solution
must be used.Figure 12 illustrates a direct connection to the alarm pins.
4.2 Indirect Connection
In the cases, where load exceeds 150 mA an indirect load connection is re-
quired. A relay can be used in this example. The relay must be rated accord-
ing to the load and the relay coil must match the system voltage. The system
voltage is usually 12 V (but can be also 24 V on some airplanes). Figure 13
shows connection schematics. The relay signal lines must be protected by a
flyback diode. Use a diode, which reverse voltage
V
R
is rated higher than the
system voltage.
4.3 Configuration
Pins 5 and 9 on Daqu ECU connector can be used for different purposes. The
function for these pins (Relay, Alarm) must be configured in software. Please
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