Serial console problems on 11/34
fireflyst at earthlink.net
Wed Jun 21 15:57:21 CDT 2006
It's null modem RS232. The wiring of the 25 pin connector is the same as
BC05C (I copied it verbatim from the DL11-W manual).
I have it hooked to an actual DEC VT220.
Also, I can't figure out what you mean by no dtr/dsr and rts/cts. The
DL11-W has those signals.
The settings on the VT220 are 9600, Receive=Transmit, 8 data bits, no
parity, 1 stop bit.
I've also tried this with *just* ground, send and receive lines (crossed
over) - same result.
Those settings are reflected on the DL11-W.
No clue what to do at this point.
> -----Original Message-----
> From: cctalk-bounces at classiccmp.org
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Bill Pechter
> Sent: Wednesday, June 21, 2006 1:24 PM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: Serial console problems on 11/34
> What's your terminal and cable look like.
> It should be null-modem rs232.
> The DEC 11/34 uses Xon/Xoff flow control -- not dtr/dsr or
> cts/rts so those need to be looped back on the pc if you're
> using one as a vt100.
> Transmit should go to receive and receive to transmit. A
> straight through cable won't do it.
> On 6/21/06, Julian Wolfe <fireflyst at earthlink.net> wrote:
> > I have, what I now know for a fact is the correct lines set
> up on the
> > serial console on my 11/34. the correct signals are coming out
> > according to my tester box. However, I cannot respond to
> the prompt.
> > I started with the diagnostic on the front panel, which
> says if I hit
> > CLR
> > 173024 LAD EXA I should get 173000. I don't. I get 127777.
> > According to the manual there is something wrong with the
> M9301 or the
> > switches are set wrong, and all the switches are ON. Do
> you guys know
> > of anything else that could be the case? I do get
> different results
> > whether or not I hook up the faston tabs going to the front
> panel or
> > not - I get 177777 if I don't hook them up at address 173024.
> > Any help would be much appreciated, as always.
> > Julian
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