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Hey peeps. I have searched the Internet and cant find an answer. I have hooked up absolute encoders and when I try to save the current position G54 on the offsets page I get the error bad character a used. Any idea what's going on? I can losd the table and clear it, but cant save it. 

Not sure if this is a pb thing or a linuxcnc thing. I read that when himing for the first time with absolute encoders i need to save the home position by zeroing the axis and saving the cirrent position to the offsets tab.

Many thanks 

I tried Jogwheel to move the robot and encountered a problem. If I move a single axis, it's good, but if I move multiple axes at the same time, it won't be smooth because they are not synchronized.

I have some override preset buttons for  feed_percent_ , rapid_percent_,  spindle_percent_
I'm still doing simulation.Only on a MDI axis movement or run a program, if one of those buttons pressed, it doesn't release 
for about 5 seconds, and the DRO doesn't update for the same period. Otherwise it switches instantly. There is no plotter at the moment.

and more:
_To display 'rotation_xy_lb' (returns float), i am unable to set precision to 3 digits. Depending on calculation, it is filling the label.

_Is there something similar to bool label, but to display a .png? For spindle is on, or spindle at speed and others it would be a good alternative to text.

 

The RPI5 needs the newer ( hm2_spix ) driver.

Yes, PWM is digital.

When I say voltage mode this means that the (average) motor voltage
is proportional to the PWM duty cycle..

This type of drive behaves like a velocity mode servo because the motor speed
is more or less directly proportional to the PWM duty cycle. That is why it is tuned
similarly to a velocity mode servo, where FF1 play a key role.

my try 
www.youtube.com/shorts/2hvAz5HbPGM

Ahhh,

When you say run y axis and a axis in tandem do you mean you have a 4th rotary axis (for cutting pipe) or just have 2 motors on the gantry that you need to move together?

For the first see my comment above......
For the second

Make a new config, select your "a axis" as tandem Y.

You will need homing switches on each of the 2 y axis so the joints can square themselves before becoming an axis. Once they are homed both will move at the same time and jog like normal.

No gcode changes for this one.

The 7i92t has 17 signal pins that are on the same pins as a parallel port. The gnd pins are on the same pins as well. So yes electrically it is the same.
The only thing is that some ground pins can be jumpered to supply 5v, the manual explains this.
The major difference being, your are not locked into pin direction as you are with a parallel port. The pin function (direction) is controlled by the bitfile loaded into the card.
So yes if a system previously used a parallel port, the 7i92t can with a suitable config be a "drop in replacement" with Linuxcnc. With the bonus of having an extra 17 Io pins on the second connector, so one could think of it as replacing 2 parallel ports.
Obviously one can not use it to actually connect to a printer to print.
If you compared the pinout on the ports of the 7i92t with that of a parallel port you will see the pins that have IO are connected physically to the same pins on a parallel port, as are the gnd pins,with the exception of those pins on the 7i92t that can be jumpered to supply 5v instead of being gnd pins.