@droftarts Hi Ian I continued to work on finding the right configuration. I used the information you sent me while remaining in RRF2 but the results were not good. I then decided to saturate all the Hw connections of the DUET2 board before engaging those of the DUEX5 and I subsequently set the indices of the heaters, motors and tools accordingly.
I connected the 5 motors for the axis movements to the 5 Duet Driver Chips and I inserted the BLTouch at the end of the PWM chain of heaters on the DUEX5, and the result was excellent.
I send a pdf that shows how the boards have been connected to sensors and actuators and the config.g file generated manually with the correct indexes plus M584 X0 Y1:3 Z2:4 E5:6:7:8 P:3 instruction to Map motors on axis(/assets/uploads/files/1583499901268-final-connection-schematics.pdf) .
I didn't switch to RRF3 because I achieved the goal with the 2.5 release of the FW and because I saw that the command syntax in RRF3 is much more complex and needs further study on my part.
Thanks for the great support you have given me.
regards
     Paolo Francia
config.g
Final Connection schematics.pdf