2.2. INPUTS DETECTION
2.2
Inputs detection
For the general purpose inputs the electrical conditions are as follows:
Logical State
Electrical State
Active
0V
to
1V
Inactive
2.9V
to
32V
or Open
A typical input configuration consists of the input connected trough
a switch to GND. This makes the input float whenever the switch is
off indicating to the unit that the input is open, and makes the input
go to 0V when the switch is close indicating an ON condition to the
unit.
A voltage detection can be used too:
•
Any voltage above
2.9V
on the input will be indicated as OFF
(inactive).
•
Any voltage below
1V
on the input will be indicated as ON
(active).
The maximum input voltage is
32V
.
2.3
Ignition detection
The electrical conditions for the ignition input are:
State
Voltage range
Ignition ON
5.8V
to
32V
Ignition OFF
0V
to
4.8V
or Open
This detection is different than inputs’. The ignition detection circuit
is different than inputs’: Any voltage above
5.8V
on the ignition input
will be detected as ignition ON. Anything below
4.8
will be detected
as ignition OFF.
Under this conditions, this input is designed to be connected to the
ignition’s key position that closes the circuit between the battery’s
positive voltage and the vehicle’s electrical system. It should not be
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