24 Jan
2002
24 Jan
'02
9:40 a.m.
On January 24, Doc wrote:
That depends *completely* on the terminal. Several even have both
DTE- and DCE-wired connectors.
My standard rule for dealing with an RS232 in-yer-face is to plug it
in without a null modem and see if it works...if it doesn't, then plug
in a null modem.
-Dave
--
Dave McGuire
St. Petersburg, FL "Less talk. More synthohol." --Lt. Worf
The problem is
that the IBM 3101 don't establish communication
with the Linux system. The 3101 show one "Line Check 2" message
that talk about the comm.line, I suppose. The cable used is one
normal serial cable.
If by "normal serial cable" you mean a standard port-to-modem cable,
that is most likely your problem. You need to use a null-modem serial
cable with a terminal. 
24 Jan
24 Jan
2:30 p.m.
On Thu, 24 Jan 2002, Dave McGuire wrote:
On January 24, Doc wrote:
Oops. My mistake. I should have said "You need to use a null-modem
serial cable with an unmodified IBM 3101 terminal"
Doc
If by "normal serial cable" you mean
a standard port-to-modem cable,
that is most likely your problem. You need to use a null-modem serial
cable with a terminal.
That depends *completely* on the terminal. Several even have both
DTE- and DCE-wired connectors. 
25 Jan
25 Jan
4:36 p.m.
--- Dave McGuire <mcguire(a)neurotica.com> wrote:
On January 24, Doc wrote:
That depends *completely* on the terminal. Several even have both
DTE- and DCE-wired connectors.
I've seen that on some 3rd party VT100 clones (CiTOH), but it was two
connections - one for host, one for external printer, or two hosts (with
a keyboard sequence to swap the active port) - one was a DB25F, the
other a DB25M, but only because the primary use for them was to act
like DTE on one and DCE on the other (the dual-login thing was obviously
a hack that got documented - not even VT100s could do that back in the
day).
The
problem is that the IBM 3101 don't establish communication...
If by "normal serial cable" you mean a standard port-to-modem cable,
that is most likely your problem. You need to use a null-modem serial
cable with a terminal. My standard rule for dealing with an RS232
in-yer-face is to plug it
in without a null modem and see if it works...if it doesn't, then plug
in a null modem.
I either use a traffic light or my magic cable. I built it when I was 16.
I need to ohm it out someday, but it has the property of magically unhosing
serial connections that are hosed. It's not simply 2-3 and 3-2... there's
some handshaking swapping going on. I built it to hang off of my C-64
RS-232 cart and attach to a variety of things including an ancient EPROM
programmer. I've kept it because it's a magic cable that rarely lets me
down when a device needs more than just TXD and RXD.
-ethan
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26 Jan
26 Jan
7:40 a.m.
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11:08 a.m.
New subject: RS-232 (was Re: IBM 3101 Dip Switches Configuration)
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
^^^^^^^^^^^^^
If that's what I think it is (an in-line adapter with LEDs monitoring the
Wahoo! That _is_ odd.
-ethan
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My standard rule for dealing with an RS232
in-yer-face is to plug
it in without a null modem and see if it works...if it doesn't,
then plug in a null modem.
I either use a traffic light or my magic cable. I built it when I was
16. most important signals), then I call it a Xmas Tree
Yes. Same thing, different name.
Certainly something _everyone_ who works with serial
comms should get.
They're not expensive (about $10 to $20, I guess).
Rat Shack has one for around $14, with 7 bicolor LEDs. The nice ones
have one red and one green LED for each signal (23 or 24) and can
be used to divine strange devices and jumper up a fix.
...it has the
property of magically unhosing serial connections
If it manages to 'unhose' the hardware handshakes on an HP82164
HPIL-RS232 interface I'll be seriously impressed!...
A cable to link 2 82164s has to sawp RTS with DSR and DTR with CTS.
11:25 a.m.
New subject: RS-232 (was Re: IBM 3101 Dip Switches Configuration)
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2:39 p.m.
New subject: RS-232 (was Re: IBM 3101 Dip Switches Configuration)
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
That's the one I have. I got it about 15 years ago. Opened it up and saw
some _terrible_ soldering. Resoldered everything before I even tried to
use it. But it's never given me any problems since then...
Mine, too... I had a cold solder joint in mine that I noticed because the
LED wiggled a *lot*.
-ethan
__________________________________________________
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Great stuff seeking new owners in Yahoo! Auctions!
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> I either use a traffic light or my magic cable.
Rat Shack has one for around $14, with 7 bicolor LEDs. The nice ones
27 Jan
27 Jan
8:23 a.m.
New subject: RS-232 (was Re: IBM 3101 Dip Switches Configuration)
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