Bidirectional Modem Port on Open Desktop (SCO Unix)

Mon Sep 17 05:46:25 AEST 1990

In article <699 at lafayet.UUCP> rob at lafayet.UUCP (Rob Freyder) writes:
>Greetings
>    I am trying to get a bidirectional modem port to work properly under
>Open Desktop.  I have Telebit T2500 connected to tty1a.  Can someone help
>me with the configuration.  

  Rob ... getting the T2500 to work on SCO software at 19200 is a 
  royal pain.

  I have just had a lengthy e-mail discussion with SCO. 
  In Summary: 

  A>  SCO drivers, even in the Sys V 3.2v2 release, are not supported
      above 9600 baud.  The good news is that the serial drivers in
      the v2 release do support the 16550 chips. ( I don't know if
      that means that they take advantage of that chips buffering 
      features however. )

  B>  Flow control is well ... not completely supported.  

     >"The serial driver only supports RTS/CTS in write mode which can be 
     >a problem if you are using this protocol with the Telebit. Presumably 
     >the workaround is to use xon/xoff instead."

  C>  SCO will not comment on the use of the FAS driver with their
      OS.  If fact they completely ignore all referances to FAS in
      all of my correspondance.

  D>  YOUR SPECIFIC PROBLEM is not related to the above 3 items 
      however :-).  Your problem is that the 19200 baud stuff is
      not even available in any part of the login terminal files
      Specificly gettydefs as released by SCO is *wrong*.  To fix
      this so that others can log into your system you must add
      the following line to your getty defs file: ( The key here
      is using EXTA for the baud rate instead of 19200 which
      as mentioned above is not supported by SCO. )

tbit# EXTA OPOST ONLCR TAB3 BRKINT IGNPAR IXON IXANY PARENB ISTRIP ECHO ECHOE EC
HOK ICANON ISIG CS7 CREAD # EXTA OPOST ONLCR TAB3 BRKINT IGNPAR IXON IXANY PAREN
B ISTRIP ECHO ECHOE ECHOK ICANON ISIG CS7 CREAD #login: #tbit

      I also added an additional line for a 9600 baud TBIT gettydef
      so that at least I have a supported version to test with. 

tbit_s# B9600 OPOST ONLCR TAB3 BRKINT IGNPAR IXON IXANY PARENB ISTRIP ECHO ECHOE
 ECHOK ICANON ISIG CS7 CREAD # B9600 OPOST ONLCR TAB3 BRKINT IGNPAR IXON IXANY P
ARENB ISTRIP ECHO ECHOE ECHOK ICANON ISIG CS7 CREAD #login: #tbit_s

-------

   The following configuration will lock the tbit at 9600 baud.  To use
   19200 substitute tbit for tbit_s in the inittab file and change
   the tbit registers so that the tbit is locked at 19200 instead of
   9600.

--- tbit T2500 configuration ---

   Note: when configuring the tbit you should have the serial port 
   disabled from dialin calls  because the Dialer file can cause 
   a different setup for the modem when waiting for dialin.

E0 F1 M1 Q1 T V1 W0 X3 Y0 &P0 &T4     Version GE6.01-T2500 
S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002 S07:050 S08=002 S09=006 S10=007 S11=070 S12=050 S18=000 S25=005 S26=000 S38=000
S41:002 S45=000 S47=004 S48:001 S49=000
S50=000 S51:004 S52:002 S54:003 S55=000 S56=017 S57=019 S58=003 S59=000
S61:045 S62=003 S63=001 S64=000 S65=000 S66:001 S67=000 S68=255 S69=000
S90=000 S91=000 S92:001 S93=008 S94=001 S95:001 S96=001 S97=000 S98=003
S100=000 S101=000 S102=000 S104=000 S105=001 S106=000 S107=020
S110:001 S111:030 S112=001
S121:001 S130=002 S131:001
S150=000 S151=004 S152=001 S153=001 S154=000 S155=000
S160=010 S161=020 S162=002 S163=003 S164=007 S255=000

To program:

ATS07=050
S41=002
S48=001
S51=004
S52=002
S54=003
S61=045
S66=001
S92=001
S95=001
S110=001
S111=030
S121=001

  Stop !!

S131=1

Programming S131=1 is not as easy as it appears.  Save the config before
prgramming S131=1. Change S52=1 and save the config, this prevents the 
config from being overwritten when cu disconnects.  Set S131=1 cu
will hang up, go back into cu change S52=2&w and you should be set.

Wheeh !!

ATE0Q1T

For 19200 operation change S51 to 5.

You will have a problem when communicating at 19200. All traffic will
stop suddenly and resume two to three seconds later. Sigh, this is,
I am afraid, related to the flow control problem mentioned above. A
possible solution may be to run the FAS driver even if you do not
have a 16550 installed. I have not yet tried this out.

-----uucp/Devices----
tb_f tty1A -   9600 tbfast \D
tb_s tty1A -   9600 tbslow \D
Direct tty1A - 9600 direct

#tb_f tty1A -   19200 tbfast \D
#tb_s tty1A -   19200 tbslow \D
#Direct tty1A - 19200 direct

#Comment out the 9600 baud entries and uncomment the 19200 baud
#entries for 19200 operation

------uucp/Dialers------
# Telebit
tbfast =,-, "" A\pA\pA\pA\pA\pT\pE1Q0S0=0X3Q0\r\c OK-AT-OK A\pT\pS95=0S50=255DT\
T\r\c CONNECT\sFAST-\r-ogin:
&tbfast =,-, "" ATZ\r\c

#
# Slow telebit connection
#
tbslow =,-,    "" A\pA\pA\pA\pA\pT\pE1Q0S0=0X3Q0\r\c OK-AT-OK A\pT\pS95=0DT\T\r\
c CONNECT \d@
&tbslow =,-, "" ATZ\r\c

#
# Note here that PEP works even when the T2500's are locked to the
# system at 9600 baud. No changes need to be made to the Dialers
# file when changing TBIT baud rates.

-------uucp/Systems------
uunet Any tb_f 9600-19200 18008776550  ogin:-BREAK-ogin:-BREAK-ogin: yyyyyyy ssword: xxxxxx 

-------etc/inittab-------
Se1A:23:respawn:/usr/lib/uucp/uugetty  -r -t 60 tty1A tbit_s
Se1a:23:off:/etc/getty tty1a m
Se2A:23:off:/usr/lib/uucp/uugetty -r -t 60 tty2A 19200

# Subsitute tbit above for tbit_s when locking the T2500 in 
# 19200 mode.
--------------------

  Good Luck !!
  And dont forget to re-enable the serial port.

 +--------
 |  Bill England
 |  wengland at stephsf.COM
 |
  * *      H -> He +24Mev
 * * * ... Oooo, we're having so much fun making itty bitty suns *
  * *