Copyright © Sigicom AB 2019
12
2.2.
LEDs
There are three LEDs (light-emitting diodes) on the top of C12.
•
Comm (yellow/orange)
Communication activity.
•
Check (white or red)
Status/operation.
•
Reg (green)
Monitoring activity.
Note! The white color of the Check LED is often not pure white but looks
more like light purple.
2.2.1.
Comm LED (yellow/orange)
•
Flashes with 50% duty cycle when the GSM modem is starting
up.
•
Will be lit continuously or in a more asymmetric way when
communication is active.
•
After a GSM connection is completed, this LED will flash
synchronously with the
Check
LED (white)to show the GSM
signal strength for one minute (if not aborted by a new
connection). There are three levels of strength, which is
represented by a number of flashes every two seconds:
o
3
works in most situations (RSSI > 30%).
o
2
may fail in urban areas with high
buildings (20% < RSSI < 30%).
o
1
will fail in many situations (RSSI < 20%).
•
If the communication fails completely the
Comm
LED will flash
synchronously with the
Check
LED (red). It is then
recommended to check the last ‘.log’ files on the memory card.
Also read the file ‘/config/modemlog.txt’, where all
communication with the GSM modem of the last failed
connection is logged. If you can’t solve the problem after this,
contact Sigicom support.
Note!
On units equipped with a 3G modem, the RSSI value is more
unreliable. RSSI values lower than the 20-30% mentioned above
may still be enough to send data.
