Dynomotion Forum

Hi Tom,

i need to drive 5 axes: stepper motor (step/dir) with encoder.

For a different application I already use KFlop, but for this one I should like to use the new Kogna.

To drive my stepper driver in open collector, I use ULN2803A
https://www.mouser.fr/datasheet/2/389/u ... 852595.pdf

From the doc, on JP14 there are Generators #6 - #11 but only from #8 to #11 are differential.
Are Generators #6 and #7 routed on JP10 only? or are they douplicate on JP14 too?

So, Can I use JP14 to generate Step/Dir signals and read my encoders for 6 axes?

Sure, from the differential signal i will use only one pin to drive the ULN2823

Thanks

Raffaello

Hi Raffaello,

JP14 has 6-axes of Differential Step/Dir outputs. DIFF 12-23. Driven by Step/Dir Generators 6-11.

#6 and #7 can be routed to other pins, but in your case you would route to JP14

See the diagram here.

Hello Tom,

I'm testing the hardware of my application and I get some strange beaviaur reading encoder #15

As I mentioned, I would to read and drive 5 axis using connection on KOGNA JP14. I use stepper motors 1.8° with encoder 4000 (tic/revolution).

When i ask to the motor to do one revolution, on the associated encoder channel i can read an incrementation of 4000 for each revolution.
Only on the #15 encoder channel I read the follow sequence:

first tour -> 3840
2nd -> 7936
3th -> 11776
4th -> 15872
5th -> 19968

If I reboot the kogna i get the same sequence and the encoder that give the right reponse on the other channels give this sequence on #15.

Thanks
Raffaello

Hello Tom,

I'm testing the hardware of my application and I get some strange beaviaur reading encoder #15

As I mentioned, I would to read and drive 5 axis using connection on KOGNA JP14. I use stepper motors 1.8° with encoder 4000 (tic/revolution).

When i ask to the motor to do one revolution, on the associated encoder channel i can read an incrementation of 4000 for each revolution.
Only on the #15 encoder channel I read the follow sequence:

first tour -> 3840
2nd -> 7936
3th -> 11776
4th -> 15872
5th -> 19968

If I reboot the kogna i get the same sequence and the encoder that give the right reponse on the other channels give this sequence on #15.

Thanks
Raffaello

Hi Raffaello,

That appears to be a Firmware bug. Please apply this patch. Download and copy to the \KMotion5.3.1\DSP_KOGNA folder. Then Flash New Version and reboot Kogna.

Please let us know if it resolves the problem or of any other issues.

Hi Tom,

thanks for the path, but the link open the file instead to download it.

Have I to copy/paste in a text file?
I'm very inconfortable to do that

Could you send me the file by email or put a download link?

Ok, forget... I just find Save link As... save as .out file

Thanks
Raffaello

Hello Tom,

I tested the patch, and it works fine!

Thanks

Raffaello

Hi Raffaello,

Thanks for taking the time to post back.