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Chris,

With ChatGPT's help I think I have found enough examples to have a go at this. I'll report back with how it goes. Thanks for your guidance.

John

Hello, 
i have a delta VFD-H, i have checked the manual there is no mention of modbus, only Serial Communications rs485 is mentioned, can i still use it with linuxcnc over rs485 ?
 

Thanks for that. I had a little formatting issue with my post that I corrected.

However, since I don't have enough inputs with the parallel port type setup to put the fault line from each driver to its own input, all three will be going to a single input. This will be corrected once I get a Mesa 7C81 if they ever go back into stock.

So, for my current setup I could do this:

net driver-fault <= hal_gpio.GPIO25-in
net driver-fault =>joint.0.amp-fault-in

Which would trigger a x-axis driver fault no matter which driver actually had a fault and stop all motion. Is this correct?

Incidentally, for my own education is this line the same as the above two lines except just on a single line?

net driver-fault => joint.0.amp-fault-in <= hal_gpio.GPIO25-in

Thanks.