Anonymous

couple things to check
-Are you hooking power to the encoder - you say you hooked up a,b and gnd.
-Are your encoders open collector? if so you will need pull up resisters on a and b.
-I have had issues with my portable that I have to hook the pluto directly into the printer port.  Any type of extention cable causes it to not work or not work correctly.  works fine with an extention on my desktop
-you could try loadrt pluto_servo epp_wide=0 <- it defaults to 1 and it could be your hardware isn't 'wide'
-On that note - is your printer port epp compatable - check your bios

sam