Telit FAQs, Part 16: How do I configure the STAT LED pin?
The STAT LED can be useful in early debugging, since it quickly indicates the state of the module. Typically the STAT LED is used to indicate the connection status as shown below.
Fast blinking (period 1s, Ton 0,5s)
Net search / Not registered / turning off
Slow blinking (period 3s, Ton 0,3s)
Registered: full service
A call is active
For many Telit modules, the STAT LED pin is not configured for this functionality by default. To configure it, issue the following AT commands:
AT#GPIO=1,0,2 // Set the GPIO to Alternate Function
AT#SLED=2 // Enable STAT LED
AT#SLEDSAV // Saves the setting