AW: [En-Nut-Discussion] Ethernet 1.3 w/modem

[Ernst Stippl]

Hi Elan!

I have not worked with Ethernut 1.3, but from some fiddling around with the
2.2 board, I remember:

I connected the pins 4-5 (RTS/CTS) and 6-8-20 (DSR/DCD/DTR) on the 25 pin
connector on the modem side to safisfy its interface signal requirements.
only 2, 3, 7 (TX, RX, GND) were connected between the Ethernut and the
modem. I do not remember if I used a straight thru or model elim cable.

One important thing is to enable to modem to start dialling without prior
"listening" for a ring tone on the phoneline. the respective command is
"ATX3" Sometimes ringtones are not detected properly by modems, due to
differenes in the various coutries' phone systems.

Sending the string "ATZ" to the modem is a reset command and is ack'ed by
the moden by a "OK" string. have you tried the UART sample program to work
with UART1 so you can see if the wiring to the modem is OK?

And dont forget to send a CR (carriage return) after each command, otherwise
the modem will not "execute" it....

hope this helps

regards
ernst

-----Ursprüngliche Nachricht-----
Von: en-nut-discussion-bounces at egnite.de
[mailto:en-nut-discussion-bounces at egnite.de] Im Auftrag von Elan Feingold
Gesendet: Samstag, 16. September 2006 20:46
An: Ethernut User Chat (English)
Betreff: [En-Nut-Discussion] Ethernet 1.3 w/modem

Sorry to ask again, but I didn't get any responses the first time.  
I'm just trying to hook up my Ethernut board with a modem (ActionTec 56K
external modem), and I'm not having any luck. I have tried both null-modem
and straight-through cables and haven't been able to get the NutChat
function to do anything except timeout. I'm using:

#define PPPCHAT     "'' AT OK ATD13106511000 CONNECT"

and I'm using UART1 for stdout, and UART0 for the modem.

Any tips or tricks or advice? I think I should be using a null modem cable,
but perhaps not.

Many thanks in advance,

-elan


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