Re: step dir inputs on Gecko Bridgeport saga

Andy, It worked nicely when connected to ground but without the
resistor.
Keith Clark

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Andy Wander <awander@v...>
wrote:

> But, unless he switches it to ground, the optocoupler will never

light(+5V

> is the "common")
>
> Andy
>
> -----Original Message-----
> From: Jon Elson
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Sent: 9/7/2004 1:10 AM
> Subject: Re: [CAD_CAM_EDM_DRO] step dir inputs on Gecko

Bridgeport saga

>
> JanRwl@A... wrote:
>
> >In a message dated 9/6/2004 8:07:29 PM Central Standard Time,
> >mail@t... writes:
> >Any suggestions?
> >Yes. The "logic level" must go "hard" to ground. Just opening

the +5

> VDC
> >source doesn't do it, as the "internal stuff" in the IC where the

gate

> involved
> >connects will often "pull up" the input line (though not

ideally).

> >
> >Suggest you connect the +5 to this DIR input via a 1K resistor,

and

> then that
> >same point to GND via the switch. The switch, then, will make

this a

> "hard
> >LOW" when closed, and a "pulled-up +ve" when open.
> >
> >
> No, not needed with the Gecko drives. They have optocouplers of

the

> 2531 variety
> that require about 15 mA to turn on. So, opening the connection

will

> guarantee
> the LED is off. What you say is totally correct for a logic gate,
> especially a
> CMOS gate, which can stay charged for days.
>
> Jon
>
>
>
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