open terminal and send this command
sudo apt install nmodbus
then enter
password is
123
then enter (you will not see it as you type it, make sure your numlock is on if you get error)
if it fails to find the package please add AitalMAC repository
and try again.
after installation open /home/CNC/configs/EPR/CNC.hal
change these two lines in this single line
loadusr -Wn modbus nmodbus -n modbus -m 1
Then look for communication error
and change to bad
save and restart the EPR program, if EPR has miter option, please make these changed to the .hal file also in EPR_miter folder