SMS-531 User’s Manual v1.1
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2.4 LED Indicators
There are three LED indicators to help users to judge the various conditions in the
SMS-531. The description is as follows:
A.
EXT (Red): The External Power LED is to indicate whether the power is
supplied or not.
The power is active
The power is not active
On
Off
B.
3G (Green): The modem LED can indicate the status of 3G module. (After
modem registered)
(1)
Use 3G SIM card.
3G module normal
3G module fail
Blanking*2 (2 sec)
Off or Blanking (not 2 sec)
(2)
Use 2G SIM card.
3G module normal
3G module fail
Blanking*1 (2 sec)
Off or Blanking (not 2 sec)
Note: When the SMS-531 sends voice alarm, the 3G LED is continuous on.
C.
STA (Orange): The System LED is to indicate if the SMS-531 is normal or
fail.
Normal(idle)
Running
3G error
Wrong PIN/PUK code
Blanking (1 sec)
Blanking (0.5 sec)
Always on or off
Blinking per 50 ms
