Contatto
ModGSM
III
Meaning of the LEDs on front panel
A small USB connector for the connection of ModGSMIII to
the PC is located on the front panel. The red LED located
on the top of this connector reports the communication
activity between the PC and the module itself. During the
communication this LED will flash showing the information
exchange.
In addition to this USB communication LED, the following
ones are placed on the front panel:
➢
LED Init
➢
LED Field
➢
LED SMS IN
➢
LED SMS OUT
➢
LED Power (ON)
The following table shows the possible combinations of the
LEDs signalling. Fourteen different situations can be identi-
fied as listed in the following table. “
FF
” means “
Fast
Flash
”, while “
SF
” means “
Slow Flash
”. Of course “
ON
”
means that the related LED is fixed ON and “
OFF
” means
that the related LED is OFF.
Init Field SMS IN SMS OUT
ON
USB
1
FF
OFF
OFF
OFF
ON
OFF
2
SF
OFF
OFF
OFF
ON
OFF
3
ON
ON
OFF
OFF
OFF
OFF
4
ON
OFF
OFF
OFF
ON
OFF
5
ON
ON
ON
ON
ON
OFF
6
ON
OFF
OFF
ON
ON
OFF
7
ON
OFF
ON
ON
ON
OFF
8
ON
OFF
SF
SF
ON
OFF
9
ON
OFF
FF
FF
ON
OFF
10
OFF
SF
x
x
ON
OFF
11
OFF
SF
FF
OFF
ON
OFF
12
OFF
SF
OFF
FF
ON
OFF
13
OFF
SF
FF
FF
ON
OFF
14
FF
FF
FF
FF
ON
FF
The listed fourteen possible combinations will be here de-
scribed:
1) It identifies the
initialization of the GSM engine
. The
LED “
Init
” flashes quickly, with a period of 0.5 seconds
2) It identifies a problem for the internal memory of
ModGSM
III
module. This may mean that
the memory
has not been programmed or that it has been dam-
aged
. The LED “
Init
” flashes slowly with a period of 1
second.
3) It identifies the
switching OFF procedure
of ModGS-
M
III
module. It starts this procedure when a power
supply failure occurs; in this case the module does not
switch OFF immediately, but it follows a sequence that
has been set by ModGSMTools program. Therefore,
for instance, it sends the SMS related to power failure
event and after the defined time delay it completely
switches OFF
4) It identifies a
communication error with the GSM en-
gine
. In this case the system will force an automatic re-
boot of GSM engine after 60 seconds fixed delay
5) It identifies the
critical errors returned by the SIM
card, requiring a reboot of GSM engine; this will be
automatically done after 60 seconds fixed delay
6) It identifies
communication problems with the SIM
card currently placed in the module. For instance, the
SIM is not properly inserted or a SIM failure occurred.
In this case too the system will automatically reboot the
GSM engine after 60 seconds fixed delay
7) It identifies an
error on entering the PIN code
, for in-
stance the entered PIN code is wrong. In this case the
system enters a lock state waiting for the resolution of
the error on the PIN code. This requires a proper inter-
vention by ModGSMTools
8) It identifies an
error on entering the PIN code
. Unlike
the previous case, this error will be reported after a
normal start of the GSM engine. The LEDs SMS IN
and SMS OUT flash slowly with a period of 1 second.
In this case the system will automatically reboot the
GSM engine after 60 seconds fixed delay
9) It identifies that the remaining
credit of the SIM card
expired
and therefore the SIM has to be recharged
with a new credit. The LEDs SMS IN and SMS OUT
flashes quickly with a period of 0.5 seconds; after 60
seconds delay, the system will reboot the GSM engine.
This condition will be repeated at each attempt to send
a SMS in expired credit condition
10) It identifies the
“normal” operation
activity, in other
words the operating condition reached after the initial-
ization and with no events pending. The field LED
flashes with a period of 2 seconds and with an
ON time in respect to the OFF time (duty-cycle) vari-
able as function of the strength of the GSM signal.
More the signal strength and more the LED will be ON
during the period
11) It identifies the
reception of a SMS
. The LED SMS IN
performs a sequence of fast flashes with a period of
0.5 seconds while the field LED continues to flash nor-
mally to shows the strength of the GSM signal
DUEMMEGI
s.r.l. - Via Longhena, 4 - 20139 MILANO
Tel. 02/57300377 - Fax 02/55213686 –
www.duemmegi.it
Rel.: 1.0 November 2011
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