Re: [CAD_CAM_EDM_DRO] Linux USB Support -- Second Keyboard (pendant)

John,

Not sure I am getting what you are saying here, but you would want to
be able to use either the keyboard or the switches (hooked to the other
keyboard circuit board).

For example if your control program uses the right arrow key
to move the X axis to the right, get a switch you want to
use to move the X axis to the right and hook it to the
keyboard circuit board matrix to output that right arrow.
Now whenever you hit that switch the axis will move to
the right. Also if you hit the right arrow key on the keyboard
it will also move the X axis. The computer does not "know"
what keyboard it came from and does not "care". All it "knows"
is that it recieved a scan code for the right arrow key, and
it took the action required.

Bill

> I took a keyboard apart just to take a look inside. I realise you can use
> the encoding piece to make you own pendant like you say but how do you get
> the computer to realise that the input coming in is the signal for an
> action? Like if I press 'A' it send a pulse that tells the program which

key

> I've pressed. But if I add another keyboard are not some of the keys, the
> ones I use on my own pendant, then taken off the other board? Or does the
> adapter for the two give the new pendant a totally different set of

outputs

> so the normal board stay fully working?
>
> I'm just curious as to how this works,
>
> John
>
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