iMETOS 3.3 has a set of 3 LEDs on top left on the motherboard and an additional LED under the SIM card holder. The top left row gives information about the running processes, and the stand-alone LED indicates the operation of a modem (see picture below).


When the battery is plugged to the board all three LEDs in the lower row turn on for an instant. After this the GPRS connection with FieldClimate.com starts and the LEDs give information about the different stages of this process.

Important note:

Complete monitoring of the communication process should be done after every installation by connecting the PC to the iMetos 3.3. How to do this is described in detail on page USB communication with PC.


Modem (stand alone LED just under SIM card holder):


  • Green LED: on, during the connection process to the GSM  network, blinking slowly (short on and long off) when it is connected to the GSM network.



Processor (from left to right, top left row of LEDs):


  • Green LED (left): USB cable is plugged (except when in boot mode – i.e. the boot  jumper I is plugged on BOOT pins)
  • Yellow LED (center): indicates one of the following:


1.      in boot mode (plugged jumper): Pessl bootloader is installed2.      in terminal mode (plugged jumper 1) the meaning of the LED is given on the screen of the terminal program in the PC3.      in normal/scheduling mode (without any jumpers) :a)      if the modem is on: modem blink code:i.      short on – long off: waiting for modem, network found, SIM card is active

ii.    short on – short on – long off: connected to GSM
iii.   short on – short on – short on – long off: connected to FieldClimate
iv.   short on – short on – short on – short on – long off: data has been sent and commands from the server have been received.


b)      if the modem is off: the measurement process is in progress, it will light a few seconds every 5 minutes.


Put all the attention in the center LED of the second row if you see the sequence of four blinks then you will know that the upload has been successful, if the sequence is not completed the red LED aside will light the take note of the last blinking mode before to identify the error.

Red LED(right):

1.      communication error (if modem is on)2.      serious system error (if modem is off)
In both cases you will need to connect the iMetos3.3 to the PC and use PI Firmware uploader to make the diagnostic and extract useful information to send to support at metos.at