Re: [CAD_CAM_EDM_DRO] L297 / L298 Help Required Pls!

On Saturday, November 8, 2003, at 01:59 PM, paragon032003 wrote:

> Could someone please explain how to connect a L297 / L298 Stepper
> driver to the PC parallel port?

Have a look at the pin outs here:
http://www.super-tech.com/root/supercam/scpinouts.asp
You can use the top right one, Portmode=Step/Dir.

Basically, it works like this:
The Dir(ection) pin controls whether the motor turns clockwise, or
counter-clockwise. If it's high, it goes one way, if it's low, it goes
the other.
The Step pin makes the motor step. It steps in the direction that the
Dir pin says it should.

> The parallel port send Step / Direction info. Hi/Low signals ... on
> two pins.
>
> What I don't understand is how this works and where the GND / + side
> comes from the PC.

Pins 18 through 26 are ground on the PC port. You connect that to the
ground for the +5v you use
for the L297. Of course the L297/L298 have to have their own +5v
supply, as the parallel port can't supply enough power for them.

>
> Additional info ....
>
> I have three stepper cards that control X ,Y, Z axis of a mill.
> When I use a logic probe on the card connectors I find the step pin is
> high by default (from the stepper card). When I turn the jog button
> this flashes the Grn (low) led on the probe then returns to high
> (red) and the stepper motor turns.

You mean the motor turns while the step pin is flashing? If so that's
good.

>

Regards,
JJ

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