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SMS on PSTN by using ATMEL 89S51 and FSK

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Prog_UC

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fsk 2211 schematic

Hi,

I am trying to implement the project of SMS (send/receive) on PSTN by using ATMEL 89S51 microcontroller.

Currently i m thinking to use XR-2211 and XR-2206 for FSK, but i dont know how to implement it.

Can anyone please help me out for that?

Regards,
Thanks
 

fsk over pstn

Where would you want to use FSK in your project? Your project objective and your problem with using XR-2211 is obscure. Please clarify!

M
 

fsk over pstn modem

The main theme of project is, send/receive SMS via PSTN, using FSK Protocol in the attached devices. For that, I select 89S51 microcontroller and XR-2211/XR2206 for FSK transmitter/receiver.
The problem is that I have no proper schematic for the selected components. How I can assemble em?

Thanks for consideration.
 

receive sms pstn

Why use FSK??? I think you can directly use DTMF signals generated by telephones to transmit the data from source to receiver. FSK might rather complicated the project.
If you still decide to go ahead with FSK, first try to go thru the data sheet for XR-2211 and XR-2206. That should give you some idea of how to implement it.

M
 

pstn modem support fsk

SMS over PSTN works only with FSK BELL202 1200bps. DTMF is not used for SMS applications over PSTN.

Try using FX-614 chip as FSK modem. Just talk to it over RS232 bus.
 

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