User guide

Inputs, Relay Outputs, and Power Status
Rev 1.0 Jan.12 43
Power Modes and Information
AirLink GX440 low power modes can be configured using ACEmanager
(Default: no power modes). You can switch power modes in response to specific
events, such as when the voltage to the device drops below a configured
threshold or when ignition is turned off, in order to conserve battery life. The
standby state, low power mode, will prevent the device from draining the battery
while allowing the device to quickly power up to regular operation when it is
needed.
The GX440 has two main power states when low power mode is enabled in
ACEmanager and whether the low power mode input signal is low or high:
1. When the low power mode input line goes low (tied to switched power), it can
be used to completely power down the GX440 (Off, 0mA) after the program-
mable timer expires or the input voltage falls below a programmable
threshold.
2. If low power mode input is kept on (tied to unswitched main power), it can go
from a full power state (180mA - 300mA) to low power mode (35mA) using
either the programmable timer or when the main input voltage drops below
the programmable threshold. In addition, the GX440 can be set to wake up at
a periodic interval with a user-defined duration if it is desired to send a
message at the same time every day.
Figure 5-3: Low Power Mode Diagram
Normal
Low
Power
OFF
LPM = 1
LPM = 0
and
Delay Period Expired
or
Voltage Threshold Crossed
or
Periodic Timer Inactive
* LPM = Low Power Mode Input Signal
LPM = 1
and
Delay Period Expired
or
Voltage Threshold Crossed
or
Periodic Timer Inactive
LPM = 1
and
Voltage Threshold Crossed
or
Periodic Timer Active
LPM = 0