LED 1 - System Active
Illuminates when power is connected to the shield.

LED 2 - Control Overrides Enabled
Illuminates if you have enabled camera control in your Arduino sketch.

LED 3 - Tally Overrides Enabled
Illuminates if you have enabled tally in your Arduino sketch.

LED 5 - I2C Parser Busy
Illuminates when communication is detected between your shield and the Arduino
using the I2C protocol.

LED 6 - Serial Parser Busy
Illuminates when UART communication is detected