Sierra Wireless AirLink LS300 User Manual page 16

AirLink LS300 User Guide
16
Pins 1 and 2
• Pin 1—VCC; Connect to +12VDC (nominal) (red wire on DC cable).
• Pin 2—Ground; Connect to ground (black wire on DC cable).
Pin 3
This pin is the ignition sense pin (white wire on DC cable). The voltage level
present on this pin turns the device on and off.
Note: If you do not connect this pin to the ignition, you MUST connect it to the positive
terminal of your power supply or battery. The device looks for a qualified voltage on this pin
as part of the power up sequence (7–28 VDC). If it doesn't see it, the device will not turn
on. If you are using a Sierra Wireless AC cable, the connection is inside the cable.
There are several typical connection options for this pin:
Option 1—If you want the device turned on and off when the engine is
turned on and off:
· Connect pin 3 to the ignition.
· In ALEOS, disable the Low Power Mode. (Default setting is disabled.)
Option 2—If you power the device from the engine's battery and you do not
want the device to drain it when the engine is turned off:
· Connect pin 3 to the ignition.
· In ALEOS, enable the Low Power Mode and set a time delay.
When the ignition is turned off, the device operates at full power for the pro-
gramed time delay. When it expires, the device switches to Low Power Mode
(consumes 35mA or less). The device resumes normal operation when the
ignition is turned on.
Option 3—If you want the device to switch into low power mode when the
engine battery voltage drops below a certain value:
· Connect pin 3 to pin 1.
· In ALEOS, configure the Low Power Mode with a voltage level threshold.
The device operates normally until the battery voltage drops below the thresh-
old value, triggering the Low Power Mode. The device resumes normal opera-
tion when the battery voltage rises above the threshold value.
Option 4—If you use a separate battery other than the engine's for device
power, (such as in an ambulance or other application that has a stand-alone
battery power system) but it isn't connected to an ignition or an on/off
switch, and you do not want the battery drained:
· Connect pin 3 to pin 1.
· In ALEOS, configure the Low Power Mode with a voltage level threshold.
The device operates normally until the battery voltage drops below the thresh-
old value, triggering the Low Power Mode. The device resumes normal opera-
tion when the battery voltage rises above the threshold value.
Option 5—If you have an installation where the device uses line power such
as in a store or a remote site where power saving isn't needed:
· Use the Sierra Wireless AC adapter or connect pin 3 to pin 1.
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