Using a digital signal for home sensing on NI9512

I have the following setup.
cRIO -> NI9512 -> P7053
I'm using an optical sensor and a flag for doing home sensing. The sensor outputs high (~4.5V) when the sensor is inactive and Low (0V) when the sensor is active.
In the axis configuration I have the option for syncing and sourcing only for my home sensor and do not have access to TTL/CMOS for digital logic.
Is there something I am missing, or does my hardware setup require me to use limit switches for home detection?
thanks in advance.

Hi,
On the MDR connector of the 9512 you have access to the forward, reverse, and home limits on pins 1, 11, and 2, repetitively. You can see this on page 10 of the manual here: http://www.ni.com/pdf/manuals/374555d.pdf
What do you mean when you say "TTL/CMOS for digital logic"? Page 5 of the manual indicates that the limits work off of +5 VDC. So your sensor should work, the device is not going to be able to tell what the voltage is coming from, whether is be a optical sensor or limit switch.
Regards,
Greg H.
Applications Engineer
National Instruments

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