pdp11/93 DB9 rs232 pinout

[Glen Slick]

On Fri, Nov 14, 2014 at 3:58 PM, Roe Peterson <roeapeterson at gmail.com> wrote:
> Can anyone point me at the pinouts for the KDJ11-E pdp11/93 DB9 rs232 connectors for the extra 7 (simulated) DL11s?
>

I just took a look at a 70-27975-01 11/93 SLU panel that I have and
these are the pinouts that I found.

SLU 1 - SLU 7 - DB9
Pin 1 - Chassis Ground
Pin 2 - SLU Output / Transmit Data
Pin 3 - SLU Input / Receive Data+
Pin 7 - Signal Ground
All other pins No Connection

Console - DB25
Pin 1 - Chassis Ground
Pin 2 - SLU Output / Transmit Data
Pin 3 - SLU Input / Receive Data+
Pin 4 - connected to Pin 6
Pin 6 - connected to Pin 4
Pin 7 - Signal Ground
Pin 20 - +12V Fused (through a 750 ohm series resistor)
All other pins No Connection

All of the Receive Data- signals (J1-7, J1-17, J1-27, J1-37, J2-27,
J2-37, J2-47, J2-57) are connected to Signal Ground.

There is a P6KE15CA TransZorb transient voltage suppressor between
each TD and RD+ signal and Signal Ground, plus another one between
Signal Ground and Chassis Ground (17 of those total).