Mesa 7i95

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22 Jan 2020 02:55 #155387 by sdwyer
Replied by sdwyer on topic Mesa 7i95
So you're saying I can generate PWM in hardware on one of the SSR outputs?

That would work for now, and I'd add a breakout board on P1 for more outputs as you suggest.

I'm using a Homan Designs Digispeed DC03 GX V3 board for isolation between the Mesa and my spindle controller. Isolation is needed because inputs in the VFD float near mains potential. Its a Sieg brushless motor and controller that came on my mill.

www.homanndesigns.com/index.php?main_pag...ncj79miq92t8amiklfe0

I'd be happy taking some GPIO from elsewhere to drive the DC03 board, and saving the SSRs for switching heavier loads via relays.

Cheers!
Shaun

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22 Jan 2020 03:02 #155389 by PCW
Replied by PCW on topic Mesa 7i95
You could use the parallel expansion port for driving that interface
Just make sure you have common grounds before you connect signals

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22 Jan 2020 03:05 #155390 by PCW
Replied by PCW on topic Mesa 7i95
Here they are:
Attachments:

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22 Jan 2020 05:14 #155398 by cmorley
Replied by cmorley on topic Mesa 7i95
Thanks Peter - unfortunately it has more then 50 pins so it will require extensive code changes - may be awhile to get this one done.

Chris
The following user(s) said Thank You: Pro_El

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22 Jan 2020 06:11 #155401 by sdwyer
Replied by sdwyer on topic Mesa 7i95
Hi Peter,

PCW wrote: You could use the parallel expansion port for driving that interface
Just make sure you have common grounds before you connect signals


To be clear, you're suggesting a software based PWM instead of a hardware based 'pwmgen' ? or am I missing something about setting modes on the GPIO pins on P1.

I'd prefer to use a hardware pwmgen if thats possible.

Cheers!
Shaun

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22 Jan 2020 17:15 #155436 by PCW
Replied by PCW on topic Mesa 7i95

File Attachment:

File Name: 7i95abob.zip
File Size:129 KB


7I95 config with PWM on pin 1 of expansion connector
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The following user(s) said Thank You: sdwyer

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23 Jan 2020 01:29 #155482 by sdwyer
Replied by sdwyer on topic Mesa 7i95
Thanks very much Peter!

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27 Jan 2020 12:28 #155895 by 0x2102
Replied by 0x2102 on topic Mesa 7i95
I noticed a problem with the 7i95 input / input-not pins in LinuxCNC 2.9 latest version. They normally flip-flop.

input-00 low
input-00-not high

input-00 high
input-00-not low

but input-xx-not stays low all the time.
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27 Jan 2020 14:24 #155909 by PCW
Replied by PCW on topic Mesa 7i95
Yes, just fixed this but I don't have push access (missing parenthesis in "not" expression)
will try to get this pushed asap

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28 Jan 2020 13:11 #156005 by PCW
Replied by PCW on topic Mesa 7i95
Note, fix just merged so a pull of master will fix this now

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