What is a CV?

A CV, or Configuration Variable, is a decoder setting. CVs control things such as locomotive address, acceleration, braking, speed tables, lighting, sound behaviour, and manufacturer-specific features.

Common examples include:

• CV1: short address.
• CV3: acceleration.
• CV4: deceleration.
• CV29: general decoder configuration, including direction and address mode.

Always check the decoder manual before changing CVs.