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Yes, a sserial card can add real time 24V I/O I would suggest a 7I84U which
adds 16x 5 to 28V 500 mA sinking or sourcing outputs and 32x 5-28V inputs.

The sserial devices are RS-422 so do not allow more than one device
per interface. This so the remote interface is real time.

The 7I95T also supports Modbus devices (mainly for VFD use).
Modbus I/O devices are common and inexpensive but do suffer
from a couple issues:

1. They are not real time
2. The inexpensive I/O devices I have tested do not have watchdogs
so leave outputs stuck on after LinuxCNC exits or there is a fault.
 

Good find there. That should fix merging, but not when there is an incomplete circle and there comes a line.

More on the philosophy around this - I don't know enough of the background to this - but when in center punch mode, would it be ok to center punch the center of any circle segment? Doesn't have to be full circle, like the center of a fillet. I mean, you go into center punch mode deliberately and mark circles. The intention is to make a center punch for all marked circles/segments. So only that should be done, no straight lines or half circles or anything. It is only making spots while in center punch mode. If so, one should rearrange the code so separate out this action, mark the center of the circle segments and ignore everything else.

I wonder if this with Smoothing off should be in the description, the PDF where center punch is described.

Hello Jpevner
What AMC drives do you have? 
First, you may need to re-tune your AMC drives. Software may still be available at AMC. I would set the drives to torque mode if possible.
After this is done then adjust the PID etc in Linuxcnc.
I converted a Denford Novaturn. My set up is Pathpilot, IBOB2, MESA 7i77, 6i25, Yaskawa SGDA 01AS servos in torque mode.  I first tuned the servos for my machine's inertia. After this was done then the PID settings.
Some of the work is located here: 
DENFORD:  NovaTurn Servo retrofit AMD Gizmosphere iBOB2 PCIe x1

Hope this helps,
Iron-Man

So that is connected with one of those network cables on the 7i84 and then clamped to the screw terminals of the 9i95?
Is it possible to connect more than one of the cards to the same serial bus?

I must admit that I mixed up smart serial with modbus, because the RS485 tricked me into believing it is similar. But I do not have a clue about all this (who can guess?). I wonder if the 9i95t still could be used with the modbus RTU, similar to the video and omiting the USB adapter. I would probably not try to research it and just spend some extra money.



Seems there are many option to add I/Os to that LinuxCNC

 

hahaha Kam

It's intriguing how people will try to point the finger at the hardware or software rather than themselves......Yes I've been guilty of that myself, but I'm less likely to do that now, at least I hope.

I did some additional testing yesterday and found that I could never get the last hole to be a full circle unless I turned smoothing off. MergeCircles or changing tolerances did not seem to influence the end result. The sketched geometry was identical for all 4 holes. I did find a thread over on the Autodesk forum that seemed to be related to the development of this post processor.
forums.autodesk.com/t5/fusion-manufactur...le-arcs/td-p/9326368

I may reach out there if this keeps happening on other parts, but for now, I think I'll just use as is and test with other parts. If anyone else would like to use the post processor, I could remove the debug statements I added and repost it here.

I'm basing the following on the 2.9.4 image. either Rpi4 or Rpi5

If you read the man page for hal_gpio you will notice there is an issue with the way the module is loaded.

Other info:
forum.linuxcnc.org/9-installing-linuxcnc...sberry-pi-4-5#320852

In the config below you will have to change the GPIO assignments to match the Byte2Bot board.
forum.linuxcnc.org/9-installing-linuxcnc...-4-5?start=10#321296

Finally it also helps if you stated the type of Pi you are using and the image.

A word of warning if you are using a RPi5 I would pay very close attention to the temperatures, as the Byte2Bot board would inhibit the cooling. I've never run my RPi5 without the cooler.

If you are using an RPi4 you may not get the stepper speeds you want.In either case it looks like they have used a very slow base period of 100000ns. Most parallel port setups on a PC aim for around 25000ns.