In-Vehicle Installation Guidelines for FOX3-2G/3G/4G and BOLERO40 Series
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negative) go directly to the battery, they need to be fused (refer to the manufacturer’s i
nstallation guidelines
manual for the vehicle).
Figure 2
:
Power supply pins are connected directly to the vehicle battery. The unit case, antenna and cables are electrically
shielded to avoid ground loops (in the diagram are shown in the green color).
The latest vehicles are equipped with a shunt circuit protection between vehicle battery and vehicle fuse box
allowing the measurement of sink current values flowing through it. Normally, when the vehicle ignition is
turned off, just a small current is drawn from the battery -
less than 50 mA
. That means, if the power pin
(+IN)
is connected behind the shunt circuit, the installed Lantronix device will not be able to draw current
from the vehicle battery while the vehicle is off, as the shunt limits the current flowing through it. Therefore,
it is recommended to install one of Lantronix devices in front of the shunt, as shown in the Fig.2 above.
According to your application requirements, several power sources may be required:
❖
The input supply voltage must provide continuous 12V/24V power and must be able to supply sufficient
current even when the vehicle is off.
❖
Voltage on the ignition pin should be 12V/24V when the vehicle is on, and 0V when it is off (for ignition
controlled application).
❖
To get input changes events, the voltage on an input pin should be 12V/24V for high and 0 V for low.
Using a voltmeter to test for these conditions will help to ensure a successful installation. During this time,
ensure that all vehicle accessories (radio, lights, air conditioning, etc.) are turned off.
If the IGN-pin is not used to control the vehicle ignition states, then it is recommended to connect it to the
operating voltage (+IN) to use the IGN - Sleep mode. With the help of an external switch this will wake up
the device from IGN - Sleep mode (with a HIGH signal on this pin).
