*BSD News Article 25030


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From: terry@cs.weber.edu (A Wizard of Earth C)
Newsgroups: comp.unix.bsd
Subject: Re: Help - Hayes modem TO SUN IPC connection Problem
Date: 16 Dec 1993 01:16:58 GMT
Organization: Weber State University, Ogden, UT
Lines: 38
Message-ID: <2eocua$dav@u.cc.utah.edu>
References: <varouhak.755908660@icarus.montclair.edu>
NNTP-Posting-Host: cs.weber.edu

In article <varouhak.755908660@icarus.montclair.edu> varouhak@icarus.montclair.edu (Thomas Varouhakis) writes:
>We are having a problem trying to connect an external "Hayes 2400
>smartmodem" modem to a SUN IPC.  
>
>PROBLEM: No response from the modem whatsoever. Leds
>HS       RD SD TR MR
>stay on all the time when the modem is turned on.

This is probably a combination of the port talking to the modem without
real DCD present plus the modem being incorrectly configured for command
echo.

(1)	The port can talk to the modem without a real connection.

You probably have not changed the port flags to make that a modem control
port, or you are forcing DCD high in the modem settings.  The proper
way to config a modem is in the Sun system administration manual under
kernel configuration (some Suns let you do this in the monitor).

(2)	The modem is echoing commands.

Turn this off if it is on (as I suspect).  The getty will spit a "login:"
at the modem (which is in command mode because there isn't a connection
yet), and the modem will echo the characters --  which are an invalid
login, but you'll get a password prompt and that will be echoed too, and
then the login will send "invalid password" and "login:" again -- which
will be echoed again, and the RD/SD lights will peg on.

Correct modem configuration is also covered in the Sun manual (I forget
which one).



					Terry Lambert
					terry@cs.weber.edu
---
Any opinions in this posting are my own and not those of my present
or previous employers.