So the DCD line goes HIGH when a carrier is detected or it is connected?
Thanks
Justin Grimm

Harold Hallikainen wrote:

> On Tue, 8 Dec 1998 16:35:52 +0800 Justin Grimm <eclipse@ACCESSIN.COM.AU>
> writes:
> >Hi All
> >Im currently programming a dial up adapter for the pic74 and wanted to
> >verify
> >the procedure for talking to a modem-
> >
> >1)
> >    Set DTR and RTS lines to high
>
>         I think I'd just leave DTR and RTS high all the time.
>
> >2)
> >    Output through UART/RS232 port the ascii chars - "ATDTphonenumber"
> >        then "0x0d"(carriage return?)
>
>         Looks good.
>
> >3)
> >    Should receive from the modem the ascii chars - "CONNECTbaudrate"
>
>         I like just waiting for DCD to go true.  Unsolicited status
> messages are too easy to miss.  Pretty hard to not see that DCD has gone
> true.
>
> >4)
> >    Should then receive data from the dialled computer
>
> >5)
> >    To disconnect -
> >        Output "ATH" then "0x0d"(carriage return?) to the modem
>
>         Stop sending data.
>         Wait (typically 1 second)
>         Send +++ (some modems require delays between characters)
>         Wait (typically 1 second... modem will anwer OK)
>         Send ATH, 0x0d
>
> >6)
> >    Should receive "OK" from the modem
> >7)
> >    Reset DTR and RTS lines to low
> >
>
>         Again, I'd just leave them high...
>
> Harold
>
> Harold Hallikainen
> harold@hallikainen.com
> Hallikainen & Friends, Inc.
> See the FCC Rules at http://hallikainen.com/FccRules and comments filed
> in LPFM proceeding at http://hallikainen.com/lpfm
>
> ___________________________________________________________________
> You don't need to buy Internet access to use free Internet e-mail.
> Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
> or call Juno at (800) 654-JUNO [654-5866]