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AirLink ES Series Hardware User Guide
32
For installations that require the gateway to be turned on/off, Sierra Wireless
recommends using the Ignition Sense (Pin 3) input for that purpose.
•
Pin 2—Use the black wire in the DC cable to connect Pin 2 to ground. See
also
Grounding the ES Series Gateway Chassis
•
Pin 3 (Ignition Sense)—Sierra Wireless recommends alway using the Ignition
Sense wire to turn the gateway off. It should not be turned off by discon-
necting power.
For installations where the ES Series gateway is turned on/off, use the white
wire in the DC cable to connect Pin 3 to:
· A vehicle ignition for turning the ES gateway on with the ignition is one
· A low voltage monitor for turning the ES gateway off when the supply
voltage drops below a defined level.
· For installations where the ES gateway is permanently on (never turned on/
off), connect the white wire to the red wire.
Pin 3 can be used as the trigger for the low power mode. For more informa-
tion, refer to the ALEOS Software Configuration User Guide (Services chap-
ter). If desired, you can also configure the ES Series gateway to notify you
when it goes into Low Power mode. For details, refer the ALEOS Software
Configuration User Guide (Events Reporting chapter).
Note: Sierra Wireless strongly recommends that you use an unswitched VCC, with Pin 3
(white wire on DC cable) connected to the ignition (if you want the ES gateway on when
the ignition is on) or connect it to a low voltage monitor (when you want the ES gateway to
turn off when the voltage drops below a defined level. See
particularly important for when the input power supply is not constant, such as vehicle
installations.
•
Pin 4 (General Purpose I/O)
to connect Pin 4 to a switch or relay on an external device you want to
monitor. For more details, see
See
Figure 3-3
and
Table
Fusing
For DC installations, Sierra Wireless recommends fusing the power input using a
2.0 A fast-acting fuse. Install the fuse on the positive line, as shown in
on page 33.
Grounding the ES Series Gateway Chassis
For DC installations (with a fixed "system" ground reference), Sierra Wireless
recommends always grounding the ES chassis or the mounting bracket to the
system ground reference. To ensure a good grounding reference, use a short wire
with a gauge of 18 AWG or larger connected to one of the mounting holes with
the screws and lock washers provided in the supplied mounting kit.
(Optional)—Use the green wire in the DC cable
page
33.
3-2.
on page 32.
Figure 3-3
on page 33. This is
Figure 3-3
4116746
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