I had to replace one of the encoders on my Chester 626 mill and had a spare cheap one from China to hand so I did some investigating and found that though the plug was wired differently to the Chester Quark brand DRO system it was very likely the basic unit would be compatible. The pin assignments are detailed in the manual so I chopped off the plug, rewired it the Quark way and bingo, it works. I also found some very helpful information on scales on the Touch DRO site which explains how to identify the wiring scheme using a multimeter.
**LINK**
William.
Edited By William Chitham on 13/01/2021 14:22:59