> Has anyone used a USRobotics Sportster 28.8 modem with VOS on a Stratus
> 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.
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
DIAL=TONE ON HOOK TIMER
&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
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