Need pinouts for MDB Systems DLV11J serial line interface

[Pete Turnbull]

On Oct 30 2004, 17:02, Vintage Computer Festival wrote:
>
> I've got a serial line interface in this LSI 11/23 system I've got
here.
> It's made by MDB Systems and is model DLV11J.  I've got the manual
for the
> DLV11 but it gives the digram for one big 40 pin Berg style
connector,
> whereas the DLV11J has 4 10-pin Berg style connectors.
>
> Does anyone have the documentation for this?

Not for that make/model, but for a DEC DLV11-J, yes.  The DLV11 is a
single RS232 interface, by the way, and the DLV11-J has 4 serial lines.

Looking into each 10-pin socket, the pinout is:

         _____________________
        |                     |
        |  9   7   5   3   1  |
        |                     |
        | 10   8   6   4   2  |
        |_____________________|

         1  UART clock in or out (not normally connected)
         2  Signal ground
         3  Tx +
         4  Tx -
         5  Signal ground
         6  Index position - no pin
         7  Rx -
         8  Rx +
         9  Signal ground
        10  +12V via fuse F1 (if fitted)

The receivers are differential.  If you're using them for an RS-232
device, connect a link between pin 7 and one of 2, 5, or 9, to make the
RX- line ground-referenced, then use 3 for TxD and 8 for RxD.

Loopback connectors for testing usually jumper 3 to 8 and 4 to 7
(RS-422 mode) but sometimes jumper 3 to 8 and 7 to 9 (RS-232 mode).

On a DEC DLV11-J, there are several wirewrap jumpers to set baud rate,
word length, address, etc, and also two to set channel 3 to the console
address, if required.  Channel 3 is the connector nearest the left as
you look into the back of a machine, with the board fitted
component-side up.  The jumpers are labelled C1 and C2; link X to 1 if
you do want the console on channel 3, or X to 0 if you don't.  There's
also a set of three labelled B/X/H which determine what happens if you
send a break if Ch.3 is the console.  Jumpering X to B makes the system
boot (it grounds the BINIT line), jumpering to H makes it halt (grounds
the BHALT line).  Leave it disconnected if you don't want either
action.

> And now for a really stupid question:
>
> Can the 11/23 run RT-11?

It will run it very well.  Several of my 11/23s came with RT-11 of one
flavour or another.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York