Re: Ethernet Modems

["Terry Olsen" <tolsen64@hotmail.com>]

I've got the serial cable set up properly (i think).  Ethernet modem mode 
now works from the GS.  I can dial out and answer calls using Proterm. 
However, the telnet session terminates at random times.

When I set the BBS up on it, I telnet in, the BBS answers the call, and as 
soon as the BBS starts sending the login screen, the telnet session 
terminates and all the characters that the BBS is sending out get looped 
back to the BBS.

I read this in the Moxa user's manual:

[Disconnection request from the local side]
When NPort Express is in data mode, the user can drive the DTR signal to OFF 
or send the "+++" from the local serial port to the NPort Express.  NPort 
Express will enter the command mode and return the "NO CARRIER" message via 
the serial port, and then input the "ATH" for shot down tcp connection after 
1 second.

Ok, here's the rub.  I used the following to make my cable.

 IIgs            PC  Female Dsub
Mini-Din 8   Dsub-25F  or  Dsub-9F   Dsub Signal

  3           3             2         RXD
  5           2             3         TXD
  4,8         7             5         GND
  2           4             7         RTS
  1           5,6,8         1,6,8     CTS, DSR, DCD
  7           20            4         DTR


I ignored the pin numbers on the Dsub-9F connectors because they are 
different on the DE-311.  I connected the IIgs Mini-Din 8 pins to the 
respective SIGNALS on the DE-311.  It works great.  When the user terminates 
the telnet session, the BBS recognized a "dropped carrier" and resets. 
However, the DTR is connected to the DCD input on the GS port.  If I 
disconnect that to stop the random telnet terminations, I lose the ability 
to to detect a "dropped carrier".

Here are how the pins are defined on the DE-311 box:

DB9 Female:
1    DCD
2    TxD
3    RxD
4    DSR
5    GND
6    DTR
7    CTS
8    RTS

If you can give me any insight, it would be appreciated.

I know also that the GS port is an RS422 port.  The DE-311 can be a RS422 
device also.  Here are the pinouts for that configuration:

1    RxD-(A)
2    RxD+(B)
3    TxD+(B)
4    TxD-(A)
5    GND
6    CTS-(A)
7    CTS+(B)
8    RTS+(B)
9    RTS-(A)

Would it be better to hook this up as an RS422 interface?  I've tried but 
can't figure out pins 6-9 and where they go on the GS port.

Thanks!
Terry


"Jeff Blakeney" <CUTjblakeney@sympatico.ca> wrote in message 
j711s0potfbbrg0oq3nqdkkpgc37q6fip2@4ax.com">news:j711s0potfbbrg0oq3nqdkkpgc37q6fip2@4ax.com...
>
>>2. The device evidently uses unicode characters for its "Ethernet Modem"
>>mode and "Console" control.  As I said before, I can telnet into it and 
>>talk
>>back & forth with my GS just fine.  But sending commands to the device 
>>from
>>the GS (like AT&V) gets no response, and I also get no response from it in
>>"Console" mode either.  However, both of these features work great when 
>>the
>>device is hooked up to the serial port of my PC.
>
> Are you sure your serial cable on the IIgs is wired properly for the
> settings on both the IIgs and the Ethernet Modem?  If you want to use
> hardware handshaking between the IIgs and the Ethernet Modem, which
> would probably be the best way to hook it up, you have to make sure
> that both the IIgs and Ethernet Modem are set up to use the same
> hardware handshaking as well as making sure your serial cable is wired
> correctly.
>
> -- 
> Jeff Blakeney - Dean of the Apple II University in the
>                 Apple II Community on Syndicomm.com
> CUT the obvious from my address if you want to e-mail me