If you have exhausted all driver solutions and communication still fails, suspect a hardware fault: either the main control board capacitor (common in RP series) or the USB interface board.
This paper covers:
| Parameter | Min | Typ | Max | Unit | |--------------------------|-------|-------|-------|--------| | Supply voltage (Vmain) | 21.6 | 24.0 | 26.4 | V DC | | Logic voltage (Vlogic) | 4.75 | 5.0 | 5.25 | V DC | | Drum motor drive current | – | 4.2 | 6.0 | A (rms)| | Peak inrush (clutch) | – | 1.5 | 2.5 | A | | PWM frequency (drum) | 15.6 | 20.0 | 20.0 | kHz | | Logic input low | 0 | – | 0.8 | V | | Logic input high | 2.0 | – | 5.0 | V | Driver RISO Rp 3105 EP