Interface on low-cost linear scales?

I´ve recently purchased a couple of cheap noname (chinese?) linear
scales. No documentation on the interface was supplied. After some
hours with the oscilloscope trying to decode the signals (clock and
data) I´m completely lost. Can anyone help me decode the signals??
I´m planning to use 3 scales connected to a PC as a DRO on my
milling
machine.

/Hal