PDP 11/23+ progress

[Allison]

>
>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>
>
>
>> >
>> >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?

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