Anyone use USRobotics modems with VOS??

Anyone use USRobotics modems with VOS??

Post by Richard Shufo » Tue, 21 May 1996 04:00:00

> Has anyone used a USRobotics Sportster 28.8 modem with VOS on a Stratus
> Continuum?

> We want to use one simply for dial-up login access.  Connecting to it
> appears to work just fine but when you disconnect VOS appears not to see
> you go away. Things are pretty mucked up until you use "uci" to clear the
> device up.  Any help out there?


> Are your modems set to drop DTR when carrier is lost and do the cables pass
> this through or is DTR held high continuously? VOS wants to see DTR go down
> and back up.

> We have a problem that our window_term ports won't get the login prompt when
> we reboot until we remove DTR and reassert it--even on non-dialup ports.

> I'm replying to my original post.  I ended up tying DSR and CD together on
> the modem end of the cable.  The resulting DSR transition makes VOS happy.
> Other modems make it easy to configure the proper DSR operation but I
> couldn't figure out how to make the USRobotics modem do it.  Oh well.

James is correct when he notes that the VOS operating system treats
serial ports differently according to whether the physical port is set
up as a "terminal" (old async) or as a new-fangled "window_term" port.
(At least on older hardware.)

If tying DSR and CD together works, then I do not quarrel with your
solution.  The difference in semantic meaning between these two
signals is negligible in many applications.  (But I haven't tried it
myself on a Stratus....)  The major thing to avoid is the Stratus host
keeping a login session open after the modem has dropped carrier.

One resource for modem-administration information is "Celeste's Tutorial
on Solaris 2.x Modems and Terminals", available on the World Wide Web via
this Uniform Resource Locator:

Celeste suggests that the US Robotics Courier V.32bis/V.34 Fax-Modem
is better than the Sportster for use at the host end of the connection,
and gives these setup parameters for the Courier:

        B0  C1  E1  F1  M1  Q2  V0  X0
        BAUD=38400  PARITY=N  WORDLEN=8
        &A0  &B1  &C1  &D2  &G0  &H1  &I0  &K1  &L0  &M4  &N0
        &P0  &R1  &S0  &T5  &X0  &Y1  %N6  

        S00=001  S01=000  S02=255  S03=013  S04=010  S05=008  S06=002  S07=060
        S08=002  S09=006  S10=007  S11=070  S12=255  S13=000  S14=000  S15=000
        S16=000  S17=000  S18=000  S19=000  S20=000  S21=010  S22=017  S23=019
        S24=150  S25=005  S26=001  S27=000  S28=008  S29=020  S30=000  S31=000
        S32=009  S33=000  S34=000  S35=000  S36=000  S37=000  S38=000  S39=000
        S40=000  S41=000  S42=126  S43=200  S44=015  S45=000  S46=000  S47=000
        S48=000  S49=000  S50=000  S51=000  S52=000  S53=000  S54=064  S55=000
        S56=000  S57=000  

      DIP Switches: (UP=DIP switch up, DN=DIP switch down)

        1  UP  DTR normal
        2  DN  Numeric messages (a starting point for usage by the tip program)
        3  DN  Display Result Codes
        4  UP  Modem does not echo commands
        5  UP  to have modem answer on 1st ring; or
           DN  for no auto-answer
        6  UP  CD indicates the modem is online and carrier signal is present
        7  DN  suppress result codes in answer mode
        8  DN  Normal AT command set recognition
        9  DN  on Escape code (+++) modem stays online
       10  UP  Power on loads registers from NFRAM

 ...Richard S. Shuford  | "A prudent man sees danger and takes refuge,

 ...Info-Stratus contact|  Proverbs 22:3 NIV