Very Computer

The pins on a DB9 connector are:
1 DCD
2 RD
3 TD
4 DTR
5 SG
6 DSR
7 RTS
8 CTS
9 RI

Dumb terminals only need like rd,td,sg

Matt
--
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 Matt Falenski  Westmoreland County Community College  Data Center WS

      Do you need a silencer if you are going to shoot a mime?
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: I assembled the cable OK and hooked the two computers. I am now having
: problems getting a login on the 286.  I use a DOS shareware program as
: my terminal emulator.  It's called Telemate, if that rings any bells.
: I have the following in my gettydefs:

: #9600 bps remote dumb terminal

: This is straight from the Serial-Howto.

: I also have in inittab:

: # Serial lines
: s1:456:respawn:/sbin/getty ttyS1 DT9600 vt100

: I have a modem attached to cua0 but I'm not sure how the cua numbers
: relate to the ttyS numbers.  In other words, is ttyS1 right for the
: serial port?

: I also see the following message when Telemate comes up on the 286:

: Caution: CTS is off

: and then:

: RTS/CTS flow control is off because CTS is off

: I DO have the RTS and CTS lines wired correctly.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

try setting up your DOS proggy to hardware flow control, this worked for me!

: Is there any way to simply verify that I am even sending anything to
: the terminal?  Also, does anyone know of a DOS program that *simply*
: does terminal emulation?  Telemate is a full blown comm program that
: is a little top-heavy for the job I want it to do.  I tried Kermit but
: couldn't get anywhere with it.  This problem is very tricky since
: right now, I don't know which component is malfuntioning, Linux getty,
: Linux inittab, the physical cable itself, the 286s hardware,
: Telemate... Just being able to knoe what is wrong would be a great
: help!  Any suggestions welcome.

: ===========================================================================
: | Greg Propf, Towson State Univ   |  "First things first, not necessarily |
: | Towson, MD (physics '96)        |    in that order" - Dr. Who           |
: ===========================================================================

You can use a standard straight through cable if you also get
a small (2" long or so) null modem adaptor.  I think I got a
null modem adaptor from (don't tell anyone) Radio Shack/Tandy.
Works for me.  I use an old XT I picked up for peanuts for the
dumb terminal.  Cables I make tend to be somewhat unreliable.
They just don't seem to have a good life expectancy...
--

"I wouldn't have made it up if it wasn't true."

Quote:>If you happen to also have DOS on your machine, or can get to a DOS
>6.0 or higher (I think---but definitely with 6.2), use ``help
>interlnk'' from the DOS prompt.  It gives all possible wiring
>combinations for DB9 and DB25 ports.  Mind you, I only know this
>because a friend of mine juryrigged a 25--9 connection last night to
>link his PC and my laptop. :-)  Amazing, the things one can learn. :)

Pin Connections for a Serial Cable

This section describes the wiring specifications for serial Interlnk
cables.

Make a serial cable with either a 9-pin or a 25-pin female connector on both
ends. Three wires are required for data transmission: Ground-Ground,
Transmit-Receive, and Receive- Transmit. Seven wires are required if you
want to use the remote copy feature. Wire the cable as follows:

9 pin           25 pin              25 pin          9 pin
=====           ======              ======          =====
pin 5           pin 7   <------>    pin 7           pin 5
                        (Ground-Ground)
pin 3           pin 2   <------>    pin 3           pin 2
                      (Transmit-Receive)
pin 7           pin 4   <------>    pin 5           pin 8
                           (RTS - CTS)
pin 6           pin 6   <------>    pin 20          pin 4
                            (DSR - DTR)
pin 2           pin 3   <------>    pin 2           pin 3
                    (Receive-Transmit)
pin 8           pin 5   <------>    pin 4           pin 7
                           (CTS - RTS)
pin 4           pin 20  <------>    pin 6           pin 6
                          (DTR - DSR)

Jean de Lafontaine was kinda right, when he said:
"On a toujours besoin d'un plus petit que soi"...