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From: bob@obiwan.uucp (Bob Willcox)
Subject: Re: Using the sio ports for terminals w/o modem ctl signals
Organization: Bob's Place, Austin TX
References: <24grraINNl92@kralizec.zeta.org.au> <1993Aug15.232601.17314@fcom.cc.utah.edu> <CBv07B.Hzy@willcox.uucp> <1993Aug16.190323.6894@fcom.cc.utah.edu>
Message-ID: <CBvvIG.7vB@obiwan.uucp>
Date: Tue, 17 Aug 1993 03:10:50 GMT
Lines: 58
In article <1993Aug16.190323.6894@fcom.cc.utah.edu>,
A Wizard of Earth C <terry@cs.weber.edu> wrote:
>
>SIO Terminal # on 25 pin cable
>
>SD ------------------------ RD 2
>RD ------------------------ SD 3
>RTS -+ 4
> |
>CTS -+ 5
>
>GND ------------------------ GND 7
>
>DTR -+ 8
> |
>DCD -+ 20
>
>On a 9 pin connecter, not all of RTS, CTS, DTR, and DCD are present. Tie
>the three that are together; this will satisfy the board.
>
>Generally, terminals will not need CTS/RTS or DCD/DSR signals; however, I
>see by your posting you are from IBM. IBM-3101 and similar terminals have
>no way to switch off the requirements for for some signals; pick a line
>that the terminal holds high and use it to hold the needed signals high,
>but don't use the same line for more than 2 or 3 at the same time or you
>may sink too much current.
Well, these are not IBM-3101s (actually, they happen to be Dell
MT-15s). I don't think I've made myself clear. The adapter that
I'm trying to hook the terminals to is a BocaBoard BB1008. This
is a brain-damaged board that does not have the DTR/DCD signals
available. Connection to the board is via RJ-11 jacks with only
6 conductors. They are:
RJ-11
Pin # Signal
1 RTS
2 Frame Ground
3 TX
4 RX
5 Signal Ground
6 CTS
As you can see, the DTR/DCD signals never leave the board. As far
as I can tell, this makes the board useless for modems, but all
I'm trying to use it with are locally attached terminals (that are
set up to use software flow-control, they don't support RTS/CTS
flow control).
It sounds (from Bruce's posting) that by setting CLOCAL (and keeping
it set) sio will work with this setup. Unfortunately, I have not
had the time to work on this lately.
--
Bob Willcox ...!{rutgers|ames}!cs.utexas.edu!uudell!obiwan!bob
Phone: 512 258-4224 (home)
512 838-3914 (work)