On Fri, 5 Mar 2004 11:31:16 -0800, "Tony Berlin"
wrote:

Machine: Vintage Boss 6 BP CNC. Accepts commands from a PC via RS-232,
rather than a tape generated program.

The CNC CAD/CAM program looks great, the post processor working perfectly,
but...........and here's the question, we need to find the pin-outs for the
serial cable; three wires plus ground from the controller. Any input? All is
appreciated.

Probably --not certainly but probably-- one input and one output,
So the one with appreciable voltage between it and ground (6 to 12
volts) would be the output that the controller uses to acknowledge
input (TD). The other one, with a few millivolts between it and
ground would be the input (RD).

Possibly one of these pinouts

http://www.connectworld.net/rs232.html