35814RE: [midatlanticretro] PDP-11/23 console port
- May 5, 2014
>Hello,from the PDP-11...but i'm having trouble with receiving.
>I'm trying to make my own crappy cable. I've got my system /receiving/
>Cory - I'm using the M8043 Print Set (MP00586) as a guide. It's on
>I've tried 8 to 3 with 7 tied to 9, 7 to 9 detached, no luck.
>Can I get a DLV11-J to DE9 diagram? I'm stumped.
Bitsavers as part of the PDP11/23 Field Maintenance Print Set (MP00740).
Here's a copy of MP00586 that I extracted from MP00740 ->
Page 11 of that PDF shows the pin numbering (when viewing the 10-pin box
header from the mating side).
Page 10 of the PDF shows the RS232 I/O connections.
Pin 7 (RCV DATA -) needs to be tied to Pin 9 (GND) at the 11/23 end of the
Once that is done, connect:
11/23 pin 3 (XMT DATA +) to DE9 pin 2 (RXD)
11/23 pin 5 (GND) to DE9 pin 5 (GND)
11/23 pin 8 (RCV DATA +) to DE9 pin 5 (TXD)
I also do loopbacks at the DE9 as follows:
Pin 4 (DTR) to Pin 6 (DSR)
Pin 7 (RTS) to Pin 8 (CTS)
This setup works fine between my USB-to-RS232 adapter and my 11/23 (M8189 or
Perhaps also check that your terminal program (PC end) isn't waiting for
hardware handshaking (CTS/DSR).
Apart from that it *should* work.
Hope this helps.
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