Proteus Par5500: Manual

The official Proteus PAR5500 manual emphasizes preventive maintenance:

: The computer includes a manual mode, 12 preset programs (P1-P12), heart rate control (HRC), race mode, and user-defined profiles. proteus par5500 manual

The PAR5500 has a “time-out timer” (TOT) that limits transmissions to 5 minutes to prevent accidental blocking of the channel. 12 preset programs (P1-P12)

Because this model is older, you can find the digitized manual on the following archival sites: ManualsLib (Search "Proteus Rower") ManualsOnline Fitness repair parts databases like FitnessRepairParts.com heart rate control (HRC)