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

[Elan Feingold]

Thanks very much for the email! I think my problem is that I am only  
using the TX and RX pins on the Ethernut, and I haven't worked to  
satisfy the modem's interface requirements as you point out. I found  
a good web page on this at http://www.fabulatech.com/articles/use- 
different-null-modems.html, and I will try this.

It's a bit unclear to me whether or not I need RTS/CTS (which is  
available with Ethernut 1.3, but shared with some UART1 pins). I'm  
not certain the Nut/OS uses these bits on version 1.3.

Many thanks again for your reply.

-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.
>