13 Jun
2005
13 Jun
'05
1:17 p.m.
Subject: Re: PDP 11/23+ progress
From: "Jim Beacon" <jim at g1jbg.co.uk>
Date: Mon, 13 Jun 2005 20:38:43 +0100
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
RS422/RS423 I'd have to look now. I bet someone answers before I
find may notes. Obviously you don't have the DEC connector pannel
or cables or this would be sorted out for you.
Suffice to say if the COMMON (RS232 pin 1 and 7 are not corosponding
with The right inputs the result is either inverted data or RX hears TX.
Allison
>
>I'm now getting garbage on the terminal, but have yet to figure out which
>setting I've got wrong!
>
>Jim.
>
>Please see our website the " Vintage Communication Pages" at
WWW.G1JBG.CO.UK
Likely baud rate. Try 4800n1.
Allison
I have the terminal set 4800n1, and the CPU switch and jumper settings seem
to agree (what I can see), though there must be something that is not
agreeing.
The confusing bit (for me ), is that there are two RX wires, RCV+ and RCV-,
what is the convention for using these, with say a VT320? is one of them
normally connected to earth? At th moment, I have the RCV+ connected to the
terminals TXD, and RCV- is earthed (how I found the system) - is this
correct?