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I'm doing a retrofit on a Tree 325 Mill and have purchased both the ETH300 and the UCBB to make it easier to wire up with the screw terminals and make it look more professional. What I've come to discover after the purchase of the UCBB that it only works with 12 to 24Volts which means that the 5 volt proximity switches and the 5 volt line driver from the spindle resolver will have to wired separately to one of the other Ports. Or since the inputs to the UCBB are opto isolators I can indeed use the TTL output but with a reduced current limiting resister say 470 ohms instead.
Can someone confirm that this is correct as it really would save me a lot of rewiring?

This is probably the easiest solution
IDC26 Breakout Board



Or you can make a TTL to open-collector CMOS board using an SN7407
Or you can modify the UCBB board by soldering a resistor, adding it on top of the existing optocoupler one, to make the input accept only 5V (390ohm to 1.8kohm)

Thanks RsX I thought I might end up doing something like this. No worries at least you've confirmed my findings. Onward and upward.

We test all inputs of the UCBB using 5Volts, so it should work without problems.