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Two 7i32 cards on the same 50pin cable?

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05 Dec 2014 06:41 - 05 Dec 2014 07:35 #53699 by jCandlish
Two 7i32 cards on the same 50pin cable? was created by jCandlish
Once again the documentation is unclear.

The .pdf documentation for the 7i32 mentions both a -2 and a -4 version of the part, with the -4 version having 4-axes. Only the 2 axes card is in the price list.

What purpose serves pins 25-48 on the 7i32-2?

Can a single 50 conductor cable be split to interface two 7i32-2 cards?

Thanks

EDIT: adding

Digging a bit deeper into the documentation the webpage mesanet.com/motioncardinfo.html says

current feedback microstep (up to 256 uSteps/ step) capable


the .pdf says

64 uStep/Step microstepping is possible


the wiki wiki.linuxcnc.org/cgi-bin/wiki.pl?Mesa_Cards says

7i32 Dual 1/2 to 3A stepper driver experimentally supported using a comp module:
wiki.linuxcnc.org/cgi-bin/wiki.pl?Contri...tepping_motor_driver


and the linked contributed components page the wiki references says

currently does 1/2 and 1/8 micro stepping


So, what microstepping is actually supported?

Thanks again,
_jC
.
.
Last edit: 05 Dec 2014 07:35 by jCandlish.

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06 Dec 2014 01:58 #53728 by andypugh
Replied by andypugh on topic Two 7i32 cards on the same 50pin cable?

So, what microstepping is actually supported?


If you look at the source-code of the comp it looks fairly simple:
wiki.linuxcnc.org/uploads/mesa7i32driver.comp

And that is clearly written for 1/8th stepping. But because it is a comp it could be modified for more.

It appears from the manual that SoftDMC can control it with 64 microsteps.

The hardware is documented to be able to handle 256 microsteps.

So I think that they are all correct :-)

I suspect that pins 25-48 are not connected on the 7i32-2 and that you would split the ribbon past the first connector and add a second connector for a second 7i43. However I rather think that you would need PCW to advise on that.

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06 Dec 2014 02:20 - 06 Dec 2014 02:21 #53731 by PCW
Replied by PCW on topic Two 7i32 cards on the same 50pin cable?
The 7I32 is only available as a 2 axis device
all I/O pins are used

The 7I32 is mainly intended for closed loop stepper use with SoftDMC
(SoftDMC can support the ~30 KHz servo loop needed for true closed loop control of step motors)
Last edit: 06 Dec 2014 02:21 by PCW.

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