Re: 6 steppers

[Rick Price <rickp-at-mitra.com>]

I think there may also be 5v somewhere on the parallel port, although
not all machines may support it. However I'm pretty sure a standard pc
parallel port will have it.

Jon Elson writes:
 > 
 > 
 > 
 > Till Franitza wrote:
 > 
 > > Hi!
 > > I am trying to drive 6 Steppers with the EMC.
 > > 4 work an 2 donīt.
 > > I suppose this is because the pins for stepper 4 and 5 (5th and 6th) are
 > > electrically different from the others. I read they are open collector LS TTL.
 > > When trying to measure the voltage of pin 1, that is suposed to carry dir
 > > signal of motor 4, i received nothing at all.
 > > Has anyone 6 Steppers connected to EMC? How did you connect the last 2 of
 > > them? Do I need a driver that makes the signal stronger? I want to interface
 > > to an ericsson stepper motor Driver. This works fine with the first 4 Motors.
 > 
 > Unless you have the reverse kinematics modules reconfigred for your
 > configuration, you will only get about this far, I think.  What I'm saying
 > is the problem might be the software doesn't pass all the channels.
 > If you are using a revers kinematics written for a hexapod-type machine,
 > then it should work.
 > 
 > If the problem is that the outputs are open collector, then you will need a
 > resistor to pull the signals up to +5 Volts.  Try a 1 K Ohm resistor.  You
 > can get +5 Volts from a floppy drive power cable on a desktop system,
 > or from a game port connector.
 > 
 > Jon
 > 
 > 
 >