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George,

One parallel port can handle four axis. On our breakout board on each limit
axis we have two sets of screw terminals. One is labeled home and the other
is labeled limits. The screw terminal marked signal (sig) are connected
internally to one pin. Mach2 will know which direction the stepper motor was
going.

If you are using inductive proximity sensors the other two screw terminals
gives you a place to connect the other two wires. The breakout board provids
12 volts to power your inductive proximity sensors.


Bob Campbell
Bob@...
www.campbelldesigns.com
Breakout board
THC board sets
CNC router plans
Stepper Motors

I noticed that using only 1 parallel port does not have enough pins
to handle all the limit/home switches for 3 axis and the solution is
to combine some limit switches. However, I found out that mach2
allows the use of 2 parallel ports which should provide more pins for
limit switches. A second parallel port requires me to buy a PCI
parallel port card and an additional parallel port break out board
(controller) like the www.pmdx.com. Can someone verify before I
purchase these items that the second parallel port for mach2 can be
used for additional limit/home switches?

Thanks,

Hi George:

Yes, a second port can be used exactly like the first. It just doubles the
in's and out's ...

Art
www.artofcnc.ca