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other code is required.
If the sent SMS is
valid then the GSM module send an SMS
with the status of the system to the phone
number that it received the command SMS
from.
If no return SMS is received then this
means the the sent SMS was not valid.
Probable causes are wrong format, wrong
code or the phone number that sent the
c o m m a n d h a s n o t b e e n s e t t o s e n d
commands.
A command can either contain
upper or lower case English characters.
Each sms contains only one valid command.
For a command to be considered valid it
must contain a space between the keyword
(codes, commands, e.t.c). A valid command
is always acknowledged by a return sms
containing the current status of the system.
Below we can see the SMS commands. Lets
presume the main user code is
1234.
The
format is always the same and consists of
the code, a space and then the command.
1234 ON
ARM
1234 OFF
DISARM
1234
SEND STATUS
1234 P1 ON
ACTIVATE OUTPUT
1234 P1 OFF
DEACTIVATE OUTPUT
1234 P2 ON
ACTIVATE OUTPUT
1234 P2 OFF
DEACTIVATE OUTPUT
1234 P3 ON
ACTIVATE OUTPUT
1234 P3 OFF
DEACTIVATE OUTPUT
1234 RELAY ON
ACTIVATE OUTPUT
1234 RELAY OFF
DEACTIVATE OUTPUT
REMAINING CREDITS ON PREPAID SIM
CARDS
We can verify the remaining credits of a
p r e p a i d S I M c a r d i n s t a l l e d i n t h e G S M
module by using the CREDIT command(if
this service is enabled by the provider). The
format of this command depends on the
s e r v i c e p r o v i d e r o f t h e S I M c a r d .
I f f o r
example the service provider requires that
you send the word “CR” to the number 1314
so it can report the remaining credits that the
SIM card has and your master code is
1234,
then the format of the commands is
the following
:
1234 CREDIT CR
#1314
Which means the first we send the master
code followed by the word “CREDIT”, then
the SMS content (CR), then the
(#)
and
finally the number of the service provider
(1314). If the master code and the format are
correct then the GSM will send the message
“
CR”
to the number
1314.
When it receives
an answer by the service provider it will
report this to the cell phone that sent the
credit command. The word
“
CR
”
and the
number
“1314”
must be replaced by suitable
data obtained from your SIM card service
provider
.
If an empty SMS is required , then after the
word
CREDIT leave a space and the write “#”
and the provider number
.
Please note that 5 minutes after the CREDIT
command has been sent the GSM module,
each SMS that does not contain any of the
commands in the list (ON, OFF..e.t.c) that
arrives to the GSM module will be forwarded
to the cell phone that issued the CREDIT
command.
SENDING CODES
We can also send any of the 50 general
purpose codes to the GSM module. If for
example the code
0101
is a panic alarm it can
be sent using the following 2 methods.
0101 CODE
0101 *
Using the word “CODE” or the symbol “*”
after the code has the same function.
If the
code
0101
is used to arm the system then by
sending this SMS the system will be armed.
RECORDING WELCOME MESSAGE
When GSM is calling someone and before
the system status is reproduced, a welcome
message is heard. This could be changed by
the user via a call to the GSM. Someone
could record for example the address of the
i n s t a l l e d a l a r m s y s t e m , i n o r d e r t o
understand each time which alarm system
made the call.
After the call to the GSM, proper master code
entry and system status reproduction, if
*1*1
will be dialed, then a beep is issued and the
recording starts. The recording lasts about
s e v e n s e c o n d s . A f t e r t h e r e c o r d i n g i s
finished a beep is issued and the recorded
message is then reproduced. Finally another
beep is issued and the line is terminated.
T h e r e c o r d e d m e s s a g e w i l l r e p l a c e t h e
factory installed message.