12 Volt Encoders & G320

Hello,

I have been lurking here for a while and now have few questions to
ask of those that may have done this before. I am building a small
CNC and have acquired and X Y and Z axis that came with servos. They
are rated 80 watts 32 volt, 3.3A, 3000 RPM, 2.6 kg-cm, the brand is
Hirata.The encoders on the servos are 1000 pulses per rev (Brand =
Daito Mfg) and have the following labels for the wires, : DC+12V,
GND, A SIG, A GND, B SIG, B GND, Z SIG, Z GND. I plan to use
the Mach software and I am considering the use of the Campbell
Designs Combo break out board. I am hoping to use the Gecko G320 for
these servos but am concerned if these 12V Encoders can be made to
interface to the driver. If I used an external power supply for the
encoders and opto isolated the encoder outputs so it is 5V into the
G320 would this work? or would this add any lag or noise? The last
question is what do I do with Z sig on the encoder?

Thanks in advance to everyone that give this a thought.

Chris
Tottenham, Ontario, Canada