11
GSM: GSM/GPRS status LED -
red
The numbers of the
GSM LED
flashing sequence signs the curent RSSI signal strength og the
GSM module (more flashes are meaning a better signal reception).
There is 10 seconds between the flash signals. One flashing takes 50 msec, then half a second
breaking continues.
RSSI value
(AT+CSQ)
GSM receiving signal
strength
LED flashing
(GSM)
99
unknown, faulty value
0
0..7
-113 dBm.. -99 dBm
1
8…11
-
97…
-91 dBm
2
12..15
-89
…
-83 dBm
3
16…19
-
81…
-75 dBm
4
20…23
-
73…
-67 dBm
5
24…27
-
65…
-59 dBm
6
28…31
-
57…
-51 dBm
7
STA: Status LED -
yellow
The
STA LED
assures information about the current operation. It has 3 modes:
It twill be active only if the GPRS signal transmission permitted. In this case from the beginning
of the signal transmission the LED starts to flashing.
lights continuously: the last GPRS signalling was succesful
with 3 second of breaks * nr. of flashing (the light interval period is half a seconds),
failure code (see later)
Turned off: GSM operation mode, no error
Filure codes
–
for signing the device opreation troubles
–
in case of a failure, read the
Chapter nr. 9!
1 flash
- Module failure
The serial connection is not operating properly between the module and the
Easy 2
board. After 1 minute, the device automatically tries to restart the module.
