Re: Gecko power requirements

Hi,

I will try to answer this in a non sytax-challanged way.

(1) It takes two wires to make anything go.
(2) If DC is involved, one will be "+" and the other "-"
(3) To turn something on and off a "switch" is involved.
(4) This "switch" is an output bit from your parallel port.
(5) This "switch" shorts to GND when at a logic "0"
(6) This "switch" shorts to +5VDC in your computer when at logic "1"
(7) It does a much better job of (5) than of (6).

When you connect COMMON (term 10) to your computer +5V, current flows
from your computer, thru the opto-isolator, out the STEP (term. 9)
line, back to your parallel port when the "switch" is doing (5). When
the "switch" is doing (6), no current flows.

When the "switch" does (5) then (6), that constitutes a single step
sent to the drive.

Hope that helps.

Mariss

--- In CAD_CAM_EDM_DRO@y..., JanRwl@A... wrote:
> Weyland: In a word, NO.
>
> There really IS NOT any "+5 VDC supplied" at/by the parallel port.
The TINY
> amounts you might "steal" from the logic-pins,when they are "high"
are
> almost-always NOT even 4 VDC (spec. down to 2.4!), and can supply
only
> microamperes before dropping below the min. Vcc req. of TTL or
LSTTL.
>
> Don't even THINK abowdit! You might "steal" a few mA from the
series port,
> if any, but how to do this is something I won't touch, even had
I "memorized"
> how to do so!
>
> Yes, some of Mariss' texts seem syntax-challenged; he is clearly a
bright
> mind, but he should leave "communication via the written word" to
those who
> do that! I read what he said, and it is all "correct", yet one
must already
> kinda "know all about what he is talking about" to really get the
point,
> which the reader had, already, anyway!
>
> Jan Rowland, Ignernt ol' troll
>
>
> [Non-text portions of this message have been removed]