8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes : Forum / topic http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb Creative Commons LicenseThis work is licensed under a Creative Commons Attribution-Noncommercial 2.5 India License.Rickey's World Disclaimer Ajay Bhargav - contact@nospam.com contact@nospam.com Mon, 01 Dec 2008 13:31:28 -0800 Mon, 01 Dec 2008 13:31:28 -0800 http://backend.userland.com/rss e107 (http://e107.org) 60 Search Search 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes query http://www.8051projects.net/search.php communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html
i m able to send AT-commands using hyperterminal with the modem but when i communicate with the microcontroller, i m not able to get the response of AT-commands.
i m sending a string like this:
putc("AT \r\n");

but it is not giving the required response.....it is not giving OK...
what should i do????
Plz help me on this....]]> Tue, 08 Apr 2008 22:36:53 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html is it meant to send char or string please check and reply!!!
]]> shyam<shyam@nospam.com> Wed, 09 Apr 2008 00:03:01 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html which u can see in the attachment.....
plz tell me where i m wrong.....

one more thing i want 2 know....if i will send msg, then can i write the code for text mode for reading the msg ( no need 4 PDU mode,bcoz my modem supports text mode 2)

include.pdf]]> monika<monika_23sep@nospam.com> Wed, 09 Apr 2008 03:20:32 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html There are few mistakes you might missed out. There is only carriage return while sending at command. So you don't need \n
also i think you have given space between at and \r which could be the point of error.

to enable text mode do read your modem's manual carefully.

instead of using putc use puts ]]> Ajay<contact@nospam.com> Wed, 09 Apr 2008 08:32:11 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html
i can't understand what is the problem with my code.....is there any mistake plz guide me...]]> monika<monika_23sep@nospam.com> Wed, 09 Apr 2008 21:50:28 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html
u have tested modem with the PC ...

now test ur controler the same way see if u can reeive data from PIC(controller) to the hyperterminal..

]]> shyam<shyam@nospam.com> Fri, 11 Apr 2008 23:15:27 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html problem arises when i interface modem with PIC.then there is no response on LCD.

my hardware connections are ----

for DB-9 connector-
pins 1,4,6 are connected.
pins 7 and 8 are connected.
5 is ground.
pin 2 is connected to TX of MAX and pin 3 is connected to RX.

Plz check the connections and guide me accordingly....]]> monika<monika_23sep@nospam.com> Sun, 13 Apr 2008 15:37:18 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html
i hv done the above mentioned connections bt these are not working when used with modem. these are working fine with hyperterminal.]]> monika<monika_23sep@nospam.com> Thu, 24 Apr 2008 20:21:50 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html Ajay<contact@nospam.com> Fri, 25 Apr 2008 05:13:46 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html ]]> shyam<shyam@nospam.com> Fri, 25 Apr 2008 05:28:15 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html 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.]]> Shailesh NAYAK<nayaktel@nospam.com> Sun, 27 Apr 2008 22:11:18 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html can you tell me what do you mean by making pins 4 and 7 high and what is the significance of it?]]> monika<monika_23sep@nospam.com> Tue, 29 Apr 2008 20:48:51 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html 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.]]> sashijoseph<sashijoseph@nospam.com> Tue, 29 Apr 2008 22:25:28 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html 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.]]> Ajay<contact@nospam.com> Tue, 20 May 2008 19:44:13 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html Shailesh NAYAK wrote ...

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.


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?]]> monika<monika_23sep@nospam.com> Tue, 20 May 2008 18:03:56 -0700 http://www.8051projects.net/forum-t8303.html Re: communication between GSM modem and PIC microcontroller http://www.8051projects.net/forum-t8303.html and the firmware is 657c

these help in troubleshooting things!... ]]> shyam<shyam@nospam.com> Tue, 20 May 2008 20:13:54 -0700 http://www.8051projects.net/forum-t8303.html