GSM2218PB001MAN - GSM/GPRS MT-GL User Manual Page 17
Copyright 2005, Enfora L.P
• Device in Low Power Mode when Ignition Turned Off
o Connect the power and ground wires of the MT-GL to the battery.
o Connect the ignition wire of the MT-GL to an auxiliary power source, i.e. ignition.
o Device enters low power mode when ignition line goes low. This feature has to be
enabled via the software configuration (see AT$PWRSAV command for more
details).
o Device enters normal power consumption mode when auxiliary power is supplied.
o Device goes through a reset upon ignition on.
2.8 LED Operation
The MT-GL has three LED’s on its front panel.
PWR: Indicates power to the modem. LED is on when power is turned on and the
modem is operational. LED is off when power is removed or when the
modem enters low power mode.
User LED 1: This LED can be configured to display registration, GPS fix status, or other
user functions. By default, this LED indicates GSM/GPRS registration status.
LED state of OFF indicates that the device is not attempting to register to the
network. Blinking LED indicates that the device is trying to connect to the
network. LED always ON indicates that the device is attached to the network.
User LED 2: This LED can be configured to display registration, GPS fix status, or other
user functions. By default, this LED indicates GPS fix status. The LED
remains in OFF state when invalid GPS data is received. The LED remains
ON when valid GPS data is received.