7i96 sand Spindle Servo

I bought a spindle servo and i am unsure about the wiring on the 7i96s. Do I need 4 resistors for the 4 step/dir inputs or can I do it without them?

I connect 5V and 0V as well as step+, step-, dir+, and dir-. Which encoder outputs do I need for rigid tapping on the milling machine?
 
 

7I96S        DRIVE CN3

ENCA+          9
ENCA-         18
ENCB+        17
ENCB-           8
IDX+             7
IDX-            16

STEP+         2
STEP-         11
DIR+           4
DIR -          13

GND          12   (encoder ground= 7I96 TB2 pin 9 )