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

From: Anton Erasmus
Subject: Re: [avr-gcc-list] avr to external modem interface
Date: Wed, 13 Dec 2006 22:18:34 +0200

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 

  Anton Erasmus
A J Erasmus

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