I'm trying to add a 4th axis to the MX3660 but I can't get it to work.

Can anyone tell me what I'm doing wrong (maybe om reading the schematics wrong?)
I have connected it like this:

MX3660 to stepper driver:
(Output 1+) to (DC+)
(Output 1-) to (Pul +)
(Output 2+) to (DC+)
(Output 2-) to (Dir +)

((Pul- and Dir- to GND))

Attachment 354232