Discussion in "Embedded GSM Development" started by    Izzal    Nov 21, 2008.
Tue Nov 25 2008, 05:07 pm
#11
Hello.. Thanks for your reply..

Therefore I have to try with a lower voltage MAX232. I think MAX232 also inverts the data bit. Please correct me if i'am wrong. Thanks I am working on it now
Tue Nov 25 2008, 08:15 pm
#12
Max232 do not involve data inversion, but its just a bus driver.

for lower voltage you can make use of Max3232 works on 3V check datasheet for more info
Fri Nov 28 2008, 10:05 am
#13
I have designed MAX 232 circuit still the same thing.. What to do now Ajay , Experiment UK ..
Sat Nov 29 2008, 01:34 am
#14
OK no problem

Have you got the PIC to talk to the PC using Hyperterminal.
I'd rather you used Hyperterminal as we all have that.

If no.. then please do that now
If yes, were the settings identical to those used to talk to the T610 ?




[ Edited Sun Nov 30 2008, 03:33 am ]
Sat Nov 29 2008, 04:16 pm
#15
are you using a datacable? to connect your phone with PIC?
Sun Nov 30 2008, 12:57 am
#16
plz help me out
i m new in this field
i want to interface mobile to controller
can u tell me how
Sun Nov 30 2008, 07:16 am
#17
Yes Iam using the data cable for the phone to connect to the PIC. My PIC can talk with PC, and also Phone to PC, but not PIC to Phone.

Hey gambler i will let u know if mine is working

Thanks
Tue Dec 02 2008, 09:12 am
#18
My setting are Identical to the one with hyperterminal.

What else could be the problem. :mad
Wed Dec 03 2008, 02:19 am
#19


Yes Iam using the data cable for the phone to connect to the PIC. My PIC can talk with PC, and also Phone to PC, but not PIC to Phone.

Hey gambler i will let u know if mine is working

Thanks

Izzal



OK there must be something you are missing here.
If things were as you see them the system would work

When connecting the PIC to the PC does the PIC send ATcr/lf and
what happens when you send OK cr/lf back.

Using hyperterminal can you be talking to the phone, then unplug the
phone, connect the PIC and carry on with no other changes.

Install the trial version of port logging software from here to see the details
of what is happening.
http://www.hhdsoftware.com/Products/home/serial-monitor.html

If you can do all these things, make up a back to back crossover connector for the D9
plugs.


Your data cable may have a built in MAX232 which draws its power from the PC serial port.
You will have to supply this power when looped back or connected to the PIC board.
Generally PC output pins such as DTR etc are expected to be at +12 volts
Sat Dec 06 2008, 05:58 am
#20
Thanks very much Experiment UK!! I really appreciate it.. Currently iam working on what you that told me.. thanks again. Will let you know the results

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