adding a modem to a decstation 3100

[Steve Watt]

In article <1063 at psych.stanford.edu> connie at psych.UUCP (Constance Stillinger) writes:
>In article <8102 at sdcc6.ucsd.edu> ux1925 at sdcc12.ucsd.edu (burt bakor) writes:
>> 
>> 
>> Help,
>> 
>> I'm trying to connect a hayes modem to a decstaion 3100 and can't
>I'd like to second this request for info -- I'm supposed to get an

Funny you should mention that...  I was having this EXACT problem less than
two weeks ago...  I discovered that the serial port on the back of the
DECStation is (obviously! :) RS-423 (?!???)

What this means is that the voltage swing does not have to be as great as
RS-232 requires.

Solutions?  Two that I found:
1)  Buy a Telebit.  They don't seem to care
    much if the voltage is low....
2)  Some companies are rumored to sell RS232 boosters which supposedly do
    the trick.  I built one from 1488s and 1489s.  Drop me a line if you
    want a PostScript schematic.

-- 
Steve Watt
...!claris!wattres!steve		wattres!steve at claris.com also works
If you torture your data long enough, it'll eventually confess.