Re: [CAD_CAM_EDM_DRO] Re: 3 axis home and limit switches

Caudlet:
There are five input pins... how do you connect nine switches to these five
pins?

Robert Williams
Moreno Valley, CA

----- Original Message -----
From: "caudlet" <tom@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, December 03, 2002 5:56 AM
Subject: [CAD_CAM_EDM_DRO] Re: 3 axis home and limit switches


> Robert: If switches are connected in series there is no way for the
> controller software to which one is tripped. Just like if one light
> burns out in a single string christmas light string you don't know
> which one it is. While the switches can share the same common (gnd
> or +5) they each have to go back to a seperate input pin in order to
> be "decoded". If you do hook them in series all you can do is issue
> an e-stop to the controller and you will have to manually back the
> axis of the stop. If you chose gnd (pin 25 on the pport) as the
> common then you will need pullup resistors (1K 1/4W) up to + 5 on
> each of the input pin lines so you get a solid "on" when a switch
> gets tripped.
>
>
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