Arduino and stepper motor driver

hi folks,

i have following stepper driver:
hy-div268n-5a
http://www.goodluckbuy.com/single-axis-cnc-stepper-driver-for-cnc-milling-machine-diy-max-50v-dc-4-5a.html

and motor:
http://www.aliexpress.com/store/product/a110a-57bygh56-401a-nema23-stepper-motor-2-8a-12-6kgcm-hybrid-stepping-motor/407448_909489217.html

i'm trying use arduino drive pulse necessary.

my cabling follow:

• +36v dc+ on driver
• com dc- on driver
• a+/a-/b+/b- motor phase, between motor , driver
• en-/pul-/dir- (on driver) gnd on arduino
• en+/dir+ (on driver) +5v on arduino
• pul+ (on driver) pin 13 on arduino

i used basic "analoginput" sketch example: potentiometer read, , pulse, variable in speed generated pin 13

a separate +9v connected "vin" of arduino, provide enough power usb port might not able provide

i used voltmeter, , en- vs en+ has +5v, dir- vs dir+ has +5v , pul flickering (which expected)

the damn motor not turn @ all.... it's not hard manually turn. have tried another  driver, cw-5045, same result, i'm tempted not blame driver.

linking com 36v power supply ground, did not change !

any ideas

are using stepper librairy?
how many leads used?
have shared ground?

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