A Guide TO Dcc Page 14 A Guide to DCC

14 GLOSSARY 10 Auto Reverse Automatically matches polarity between track block for cross overs and reverse loops. Back EMF Back Electro-motive Force is voltage generated in a motor while in operation. Decoders can monitor this voltage for control purposes. Booster The Booster is an electronic device that takes instructions from the Command Station, and creates the digital signal supplied to the track. Bus A specific group of electrical wires that carry a particular group of voltages or signals. Cab In DCC, a term for the controller used to operate a train. It has the throttle, plus other controls needed. Command Control A method of controlling multiple trains independent of track voltage Command Station (or Console) The heart and brains of the Digital Command Control system, it listens for commands from throttles and other devices, processes them, and sends the resulting digital data to the booster. Computer Interface A device to connect a computer to a DCC system. Configuration Variable (CV) CVs are the user adjustable variables to program the decoder. Consist Address The unique address by which a consist can be accessed. See MU consist. Consists Two or more locomotives acting as one unit. Continuous Load The maximum current that a decoder can supply to a particular output for an extended period of time without causing damage to the decoder. Digital Command Control Digital Carrier Control (DCC) A standard power and communications protocol set forth by the NMRA for the control of trains. DCC Ready Easy conversion to DCC. Usually means the motor is isolated from the frame and a standard DCC plug is provided. Digital Packet The data packet containing the information needed to control a decoder. Direct Current (DC) Direct current electricity is unidirectional as it does not change polarity on a regular alternating period. In model railroad controls, refers to the method of both powering and controlling trains by direct modulation of the voltage on the tracks. EQ Equalizing - adjusting the various frequencies of sound. Functions (F) Additional outputs on a decoder (besides motor control) for independent control, such as lighting circuits. Handheld Controller - See Cab. Heat Shrink Tubing A polymer tube which will shrink when exposed to heat. High-Frequency Decoders Decoders with this feature allow slow speed operation without a distracting buzz from the motor. Locomotive Motive power to a train - the train's engine. MU/Consisting Running more than one locomotive from a single set of controls. See consisting. Multiple Unit (MU) The prototype practice of interconnecting locomotives to function together and be controlled from one of the cabs. In DCC, it is called consisting. Mobile Decoder A decoder that's typically installed in locomotives, but can also be installed into cars to control lights, animation, sound or even uncoupling devices. Motor A mechanical device which converts energy into a force that can do work. Original Equipment Manufacturer (OEM) Company providing the original equipment. Usually refers to the electronics supplied with the model (e.g., OEM decoder). The Wires (Bus) The wires that connect the outputs of a booster or Command Station (Console) to the track or accessory decoders. Programming Lock A method of locking the decoders to prevent programming. Programming Modes Modes available for programming a decoder, typically on programming track or programming on the main. See POM. Programming on the Main (POM) A method of programming CVs while the locomotive or rolling stock is physically on the DCC booster powered part of the track. Programming Track A track set aside for programming locomotives. It may or may not be part of the layout. Pulse Width Modulation Controlling power by varying the pulse width of square wave power going to a load. Speed Table A list of settings of how fast or slow the decoder should run at a given throttle speed. Speed Steps (SS) Speed steps can be thought of as how many steps or notches there are between idle (stopped) and full throttle. Can be 14, 28, or 128 steps. Stall Current The current that an electrical motor draws when its shaft is prevented from moving. Stationary Decoder A decoder normally mounted under the bench work or alongside the track in a "stationary" position. Voltage Drop Lower voltage at the electrical load than at the power source, due to resistance in the wire.

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