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communication between GSM modem and PIC microcontroller

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Moderators: Ajay, Junied , abbas1707, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph

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Shailesh NAYAK

Sun Apr 27 2008, 10:11PM

Registered Member #2498

Joined: Mon Jul 23 2007, 01:20AM

Posts: 39
Thanked 9 times in 7 posts

Hi Monika,
Could you give paste response of feve command asked?
1) ATi3
2) AT+WOPEN=2
3)AT+WOPEN?
Please also type ATE0 (it is ATEZERO) and then AT&W. so this will stop echo from MODEM first, then you can use microcontroller. I am sure it will solve your problem. also try to handle unsolicited responses from the modem. Please let us know if it is solve your problem or not.

Best Regards

Shailesh S. NAYAK

monika

Tue Apr 29 2008, 08:48PM

Registered Member #7028

Joined: Fri Apr 04 2008, 03:31AM

Posts: 9
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yes my modem has DB9 connector.
can you tell me what do you mean by making pins 4 and 7 high and what is the significance of it?

sashijoseph

Tue Apr 29 2008, 10:25PM

Registered Member #5870

Joined: Mon Feb 04 2008, 06:26PM

Posts: 471
Thanked 106 times in 101 posts

Making pins 4&7 high means just that......pull the pins high by connecting them to Vcc (preferably through 4.7k pullups).
Pins 4 and 7 are used for flow control and probably are required to be high for comm. to take place.
You can confirm by checking the voltage on the pins when connected to the PC.

Let there be music........

monika

Tue May 20 2008, 06:03PM

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Joined: Fri Apr 04 2008, 03:31AM

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Shailesh NAYAK wrote ...

This is the response of the commands:

ATi3
657c09gg.Q24PL001 1956992 042407 11:29

OK

AT+WOPEN=2
+WOPEN: 2,"AT v03.12","AT v03.12"

OK

what is the significance of these commands?

Ajay

Tue May 20 2008, 07:44PM

Rickey's World Admin

Registered Member #1

Joined: Fri Feb 24 2006, 04:56AM

Posts: 3375
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can you tell us your basic application?
and are you using only PIC?

you can also make use of OpenAT to program your modem.

regarding AT+WOPEN:

This specific command allows to start, stop, delete and get information about the
current Open AT® embedded application.
This command also allows to erase the Open AT® flash objects storage place, and
configure the Application & Data (A&D) storage place size. Please refer to the Open
AT® development guides for more information.

AT+WOPEN = 0 : stop application
AT+WOPEN = 1 : Start application
AT+WOPEN = 2 : Get open AT library version
AT+WOPEN = 3 : Erase flash objects
AT+WOPEN = 4 : Erace embedded application

AT+WOPEN? : current state (either OpenAT application running or not)
please do not use the commands unless you know what you are doing.

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