7i76 step/dir wiring

Sorry for very bad draw .... but I hope it is clear anyway ...My drive have pin 5 for open collector usage and pin 1-2-3-4 for step+/- and dir+/- reference .... before powering I would understand if I'm wrong connections to mesa 7i76 .... If I understand well I connect on TB2

pin1-gnd ---> to nothing
pin2-step- ---> my pin 1
pin3-step+ ---> my pin 2
pin4-dir- ---> my pin 3
pin5-dir+ ---> my pin 4
pin6-5V ---> to nothing

I'm in right or I must use my pin5 connect to 5v reference (pin22 on my 7i76 card) and only pin 2 and pin4 on mesa card??

Tanks in advance

regards
giorgio

what stepper drives are you using ?

you should only need to connect +pulse +dir +en to 5v+ (TP2-6)+5V
and the - pulse to TB2-2( STEP0-) +dir to TB2-4(dir0-) & if your using the enable connect all enables to one gpio pin and attach to x-enable in pncconf
then step1 becomes your next axis , step2 next ... etc

I am going to disagree with cnbasher here and say that your proposal sounds right for differential driving of the step/dir inputs.

(And differential mode driving is better for noise rejection than unipolar)

(And differential mode driving is better for noise rejection than unipolar)

Tanks AndyPugh .... I agree with you ....

But cncbasher he made me a curiosity ... pin +en .... exist on mesa 7i76 or you mean the enable pin on the drive ??

In pnnconfig not see enable pin at all .... is the first time for me with pncconfig and 7i76 ...

Tanks at all

regards
giorgio

enable can be any gpio pin , select in pncconf as amplifier enable

the reason i chose to select unipolar was i presumed this was a stepper driver and not Servo
and as the majority of stepper drivers now have Opto's as inputs , it makes no difference to use Differential , this was brought about in the early days when using TTL driven servo amps .
it's also easier to implement . but for no other reason , it's fine .

i tend to use differential if i have noise problems . i suppose it's just habit !.