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From: Cory on 1 Jun 2010 16:34
Hi all,

Is there a way to get the index signal from the pci-quad04 hardware? I want the index from the hardware itself and not just when the encoder card resets after hitting the index.
From: Gordon Weast on 2 Jun 2010 10:31
Cory,

Our driver for the PCI-Quad04 doesn't offer any way to read out
the state of the index input. The signal is a short pulse usually.
It is only asserted when the encoder is at precisely the correct
position. In motion, the pulse only lasts one count.

You could possibly connect the index signal to some digital input
board, but unless it gets latched, you will rarely see it.

Just remember that the index input to the board has to be either
connected to the index signal, or pulled high or low. If it's left
floating, the counter sees random glitches, even if the chip is
configured to not use index.

Gordon Weast
xPC Target Development
The MathWorks

Cory wrote:
> Hi all,
>
> Is there a way to get the index signal from the pci-quad04 hardware? I
> want the index from the hardware itself and not just when the encoder
> card resets after hitting the index.
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