Telic LT910-WW - Operating States; Green LED; Status Leds (One Yellow, One Red)

LT910-WW User Manual - Telic AG
Pg 25
5.6 Operating states / green LED
The modem has a green power up LED referred as STAT_LED connected to GPIO 01. Which is
used to indicate various operating states. These states are described in following table.
Default setting:
 Set alternate GPIO function: AT#GPIO=1,0,2
 Set alternate timings: AT#SLED=4
 Safe configuration: AT#SLEDSAV
AT#SLED=4 Operating state of LE910C1-
WWX module
green LED state
Device off
Permanently off
Net search / not registered
Fast blinking (0.5s ON and 0.5s OFF )
Registered full service
Slow blinking (blinking 300ms ON and 2.7s OFF)
Low power mode activated
Permanently off
Table 7: Operating states of the green LED
5.7 Status LEDs (one yellow, one red)
The yellow status LED referred as DEBUG_LED1 is controlled by GPIO 03 and the red is called
DEBUG_LED2 and controlled via GPIO 02. They can be controlled via AT commands. The default
status of these two LEDs is off. The following commands can be used to initialize and to configure
the GPIOs to control the two LEDs:
Switching on red LED
AT#GPIO=2,1,1
Switching off red LED
AT#GPIO=2,0,1
Switching on yellow LED
AT#GPIO=3,1,1
Switching off yellow LED
AT#GPIO=3,0,1
These LEDs can be controlled e.g., by an external microcontroller via AT commands issued to the
terminal via the RS232 interface. They can be used to signal any useful status of the external
application such as:
 error indication
 status of communication (LTE, GPRS, SMS, CSD, etc.)
 status of network (to simulate network LED)
 quality of service