4GT LTE Cat-M1 Installation Manual
2019
Page | 7
1.5 LED indication of operation
Indicator
Light Status
Description
Network
Off
No connection to cellular network.
Yellow blinking
Connecting to cellular network.
Green solid with yellow
blinking
Communicator is connected to cellular network.
Sufficient cellular signal strength for 2G is level 5 (five
yellow flashes) and for 4G network - level 3 (three
yellow flashes).
Data
Off
No unseen events.
Green solid
Unsent events are stored in buffer.
Green blinking
(Configuration mode)
Data is transferred to/from
communicator.
Power
Off
Power supply is off or disconnected.
Green solid
Power supply is on with sufficient voltage.
Yellow solid
Power supply voltage is not sufficient (≤11.5V).
Green solid and yellow
blinking
(Configuration mode)
Communicator is ready for
configuration.
Yellow solid
(Configuration mode)
No connection with computer.
Trouble
OFF
No operation problems.
1 red blink
SIM card not found.
2 red blinks
SIM card PIN code problem (incorrect PIN code).
3 red blinks
Programming problem (No APN).
4 red blinks
Registration to GSM network problem.
5 red blinks
Registration to mobile data network problem.
6 red blinks
No connection with the receiver.
7 red blinks
Lost connection with control panel.
Red blinking
(Configuration mode)
Memory fault.
Red solid
(Configuration mode)
Firmware is corrupted.
Band
1 Green Blink
None
2 Green Blinks
GSM
3 Green Blinks
GPRS
4 Green Blinks
EDGE
5 Green Blinks
CAT-M1
6 Green Blinks
CAT-NB1
