Losing my mind with servo pid tuning

PCW - Thanks for your help. My servo drive will take dual inputs, and I'm considering speed input control for spindle work, and position input for C axis positioning.

I read a post of yours that said it's possible to use the P2 connector of the 5i25 connected to a generic db25 breakout board to do hardware step generation. Would I need a custom bit file, or is one available already in the 5i25.zip on the website?

Could I use a generic db25 to idc26 cable such as this: LPT1 Parallel Port Printer I O Adapter DB25 to IDC 26Pin Header Slot Plate Panel , or do I need to order one from you?

alan_3301 wrote: Andy thanks. I tried inverting encoder scale, but the encoder counts did not change direction. I changed the direction in the servo drive parameter, and tried to go through pid tuning again, but no luck.

The encoder counts won't change direction if you change the scale, but the encoder position feedback will change direction. Because position feedback is just counts x scale.

Ok I found the 5i25_7i77_7i76.bit file and will try to flash it tonight. I've got a db25 breakout on order, can't wait to try it out.

if you have a generic parallel port breakout, you do not want a 7I76 compatible pinout
as it in not parallel port compatible. 5i25_7i77_bstech.bit firmware matches the common 5 Axis ebay parallel port BOBs