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Conference hydra::amiga_v1

Title:AMIGA NOTES
Notice:Join us in the *NEW* conference - HYDRA::AMIGA_V2
Moderator:HYDRA::MOORE
Created:Sat Apr 26 1986
Last Modified:Wed Feb 05 1992
Last Successful Update:Fri Jun 06 1997
Number of topics:5378
Total number of notes:38326

2575.0. "Avatex 2400 auto answer problem" by LOWLIF::DAVIS (That's not a BUG, it's a FEATURE!) Thu May 18 1989 00:46

I need help configuring an Avatex 2400 baud modem to be hooked up to a host
computer to answer incoming calls.  I know, it shouldn't be difficult, but
this is a weird situation.  I'm hoping some of you out there have Avatex
2400's.

The modem is hooked up to a port on a Basic Four computer that is set up
2400,8,N,1.  I know the connection to the host is good because I replaced
the modem with a terminal and it works fine.  What happens is that the
modem answers the incoming call, but it doesn't seem to be passing the
received characters to the host.  (The RD light flashes, however).  I
tried another modem, but it did the same thing.  So anyway, I must be
setting the modems up wrong somehow.  I even hooked the silly thing up
to our VAX and it did the same thing!

What setting could possibly do such a thing.  I've read the manual over
and over and I can't see it.  Any takers?

...richard
T.RTitleUserPersonal
Name		DateLines
2575.1Wrong Cable ?ADOMV1::MCGHIEThu May 18 1989 02:268
    Have you checked the type of cable you are using to connect the
    modem to the computer ?
    
    You typically use a different cable to attach terminals than you do a modem.
    

    Regards
           Mike
2575.2Tried thatLOWLIF::DAVISThat's not a BUG, it's a FEATURE!Thu May 18 1989 20:419
>    Have you checked the type of cable you are using to connect the
>    modem to the computer ?

Thanks, but I don't think it's that easy.  When I put the modem on the VAX,
I just unhooked one of the Scholars that we use every day and plugged it in.
It answered the phone, but never let me log in!  I'd swear the modem was bad,
but I've tried it with TWO of them...

...richard
2575.3Obvious Modem settings etcADODEM::MCGHIEThu May 18 1989 20:5318
    Hmmm,
    
    of course you could have TWO dead modems, murphy's law etc. However if
    both of them behave in the same manner, then I suppose it's more likely
    that the problem is in the modem setup.
    
    Baud rate, parity etc ok on the modem port, i.e. the same as the VAX
    port you were testing with ? Did anything at all come back from the
    VAX, even garbage ?
    
    Are there any indicator leds on the front of the modem ? And if so what
    are they and which were illuminated ?
    
    I have done a fair amount of mucking aronud with modems over the last
    couple of years, and they can be sooo frustrating !
    
    regards
    	Mike
2575.4Dirty Little SignalsMEDDLE::ANUSZCZYKFri May 19 1989 13:4726
    Hmmm,
    
       A couple of years ago I had to interface a Racal-Vadic 1200 Baud
    modem to a Amiga 1000 (remember those!).  I had the exact same problem
    that you reported.  It turns out that the 1000 wanted to see pin
    five or six high (I forget which one) before it would receive anything.
    I tested this by connecting and pretending I was logging in even
    though I could not see anything.  Once I was pretty sure I was logged
    in I hungup the phone and called an operator to see if my job was
    now disconnected (virtual terminals were enabled).  It was!!
    
       The solution was to jumper pin 20 to pin (5 or 6) so that the
    1000 would now see the modem as active.  Oh yea, what are these
    pins you might ask.  Good question... I think they break down to:
    
          Pin  1 ... Chassis ground
          Pin  2 ... Transmit
          Pin  3 ... Receive
          Pin  5 ... RTS (Ready-to-send) from modem
          Pin  7 ... signal ground
          Pin 20 ... DTR (Data-Terminal-Ready)
          Pin 22 ... Ring Indicator
    
    Of course this is all from memory soooo...
    
    Good luck
2575.5Working, working, working....LOWLIF::DAVISThat's not a BUG, it's a FEATURE!Sat May 20 1989 03:148
re .-1

That just might be it!  I'll sure check it out and see.  Now if I could just
come up with a breakout box...

Thanks all,

...richard