RCU500 can refer to different devices depending on the manufacturer. Here are the two most common meanings:

1. Remote Controller Unit (KONGSBERG):
Purpose: Real-time control system for process applications
KONGSBERG RCU500 Remote Controller Unit

Key features:
Single-board computer (SBC)
400 MHz processor
32 MB SDRAM
16 MB flash memory
24 VDC power supply
IP20 protection rating

Applications:
Marine control systems
Industrial automation
Data acquisition
2. Rubber Cork Underlayment (Proflex):
Purpose: Sound insulation for floors
Proflex RCU500 Rubber Cork Underlayment

Key features:
1/2-inch thickness
Combines cork and rubber
Reduces impact and airborne noise
Improves IIC and STC ratings
Easy to install
Applications:
Under laminate, tile, or wood floors
Multi-family dwellings
Sound studios
Home theater