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Yes, across the THCAD input side.

bonjour, je voudrais savoirsi la carte bonjour, je voudrai savoir si une carte d'adaptateur PCI Express vers parallèle DB25 peut etre utilisee pour linuxcnc? merci fr.aliexpress.com/item/1005007091741451....gatewayAdapt=glo2fra

You mean across positive and negative of the Thad?

Okay, so this is not reproducible for you. I also think it was working for a short while for me before I started getting the following errors.

The value position-fb jumps to is consistent across time and even if unloading all modules and starting over. But it has changed as well at some time, but I'm not quite sure what has been the trigger for that. Perhaps some change in the modbus .mod "config", but I'm not sure.

I actually was also thinking about narrowing it down by a ethernet capture, and already took one with Wireshark. I could see the LBP16 commands, but have not tried to decipher what is written/read yet (by the LBP16 commands). But just by looking at the source code, it appears the step rate is written and the position feedback (16.16 floating point accumulator) is read back. It shouldn't be too difficult to figure out if something strange happens with those. Hopefully

I would put at least two of those 5K resistors in parallel, in parallel with the input of THCAD.

Is it possible to make the random tool change faster searching for the next tool in the g-code and prepare it while the program runs?

5 volt Thad
24 volt power supply.

I tried that firmware on a 7I95T with the included relayboard.mod
and stepgens set to 5 with no issues (with or without a relay modbus
device connected).

I'll try your example on Monday. Worst case, may be debuggable with
tcpdump.