LS100 DCC Accessory Decoder - 4 OutputsLS100 DCC Accessory Decoder 4 Outputs Accessory decoders are the link between your NMRA DCC system and your functional devices (that is turnouts, signals, uncouplers, etc.) on your model train layout. Accessory decoders receive commands sent from the command station via the power station and activate the drives of turnouts or other switching devices. For DIGITAL plus systems these switching commands are activated from input devices, such as, hand held