DL11 M7800

[tony duell]

>  >
> > The original cable, p/n is a 1700004-1 flat cable with Berg connectors on
> > either end so I had to find something compatible with a terminal instead.
> > I switched in the same BC03L-10 that I have been using to connect to a
> > 25-pin terminal (with null modem adapter) using a newer DL11-W. (M7856).
> 
> Does your cable connect E to M?
> 
> http://www.classiccmp.org/pipermail/cctech/2015-November/012531.html

That jumper links the output of the RS232 receiver to the input of the UART,
effectively. It shouldn't matter for transmitting. If the card won't send characters
to the terminal you need to look for other problems.

-tony