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miniDaqu — Manual 1.4 Output Power Pins
1.4 Output Power Pins
Daqu has several OUTPUT power pins labeled as
+5V
,
+12V
and
GND
. These
pins are OUTPUT pins only. They shall be only used to supply power from
Daqu to sensors connected to them. For example, active pressure sensors
require power to operate and these pins shall be used to provide power for
them.
Never connect any power source to +5V or +12V pins. This will permanetly
damage Daqu. Please refer to the sensor documentation for proper supply
voltage.
1.5 Channels
Daqu has digital type and analog type channels where each type has several
versions. Some channels are using two pins and some only one. They are
designated using capital letters.
1.5.1 Analog Channels
Most of the channels on Daqu are analog. They appear in following variations:
C – analog channel with 0 to +30 V input, used to read higher voltage
levels. Only one such channel is available and is used to measure the
system voltage. Note this is NOT power source for Daqu. Daqu is just
measuring the voltage.
E – analog channels with 0 to +5 V input. They are mostly used to read
active sensors. Active sensors require power in order to operate properly.
Do NOT connect any sensor with an output greater than +5 V. This
will permanently damage the unit.
This channel has also a current
generator, which used to measure resistance in low resitance range. The
following currents are used to measure resistance.
ˆ
for 0–200 Ω range – 20 mA current,
ˆ
for 0–400 Ω range – 10 mA current,
ˆ
for 0–1000 Ω range – 5 mA current.
The channel is typically used to connect resistive fuel level sensors.
F – This is the same as E channels with an additional possibility to connect
current output sensors (4 mA – 20 mA). For this reason it has an internal
120 Ω resistor. Rotax oil pressure is an example of such sensor.
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