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RC4 Glossary
Dim A minus (-)

Every RC4 dimmer output has two terminals. The minus, or negative (-) terminal is the one that is being modulated by the dimmer electronics. The other is the plus, or positive (+) terminal.

Dim A minus (-) is the second connection point for bare wires on an RC4 device, located between the Dim A plus (+) and  Dim B plus (+).