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Re: [avr-gcc-list] avr to external modem interface

From: Roger Furer
Subject: Re: [avr-gcc-list] avr to external modem interface
Date: Wed, 13 Dec 2006 12:06:07 -1000
User-agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.4) Gecko/20030529

I would suggest looking at AVR Freaks: http://www.avrfreaks.net/ They have several forums covering various topics. A very useful resource.

On 13 Dec 2006 at 16:29, andi suhandi wrote:

Does anyone know avr to external modem interface (for dial up internet) ?
Is it enough using three wire connection (Tx , Rx and Ground) ?
Do I have to use RTS, CTS, DSR, DTR and RI ?

(This message does not belong on this list. The avr-chat list is a much better 
You can setup a Hayes compatible modem into a mode where you only need
Rx, Tx and ground. However you then have to check the status by querying the
modem using serial commands and then having to parse the results. If the
modem is connected, you then have to switch to command mode, check the status
and switch back to data mode to tx/rx data to/from the other modem. Much easier to have a full compliment of signals required by a typical modem in it's default configuration.

  Anton Erasmus

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