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

Steve,
The controller program on your PC should be configurable as to which
Par Port pins do what to match the inputs to the stepper driver (L297).
See the L297 Spec sheet at ST Micro for connection info, but the card
connector you have is what determines the actual connections.
The PC par port is only supplying bits and a ground.
The driver card has to have its own power supplied for logic only
(could be from the PC game port).
The step signals may begin or end high or low in any pulse train sent.
RichD

paragon032003 wrote:

>
> Hello All (Sorry for the post without subject ... Half a sleep today!)
>
> Could someone please explain how to connect a L297 / L298 Stepper
> driver to the PC parallel port?
>
> 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.
>
> 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.
> This is running on an old machine that would be sent information in
> blocks at a time via an rs232 port.
>
> I am attempting to bypass this logic and go direct to the cards via a
> PC printer port.
>
> TIA
> Steve