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The DCC Glossary!Under Construction!Please send any suggestions for additions, corrections, improvements to sprog@sprog-dcc.co.uk.A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 2 Digit Address: See Address. 4 Digit Address: See Address. 7 Bit Address: See Address. 14 Bit Address: See Address. 14 Step: See Speed Steps. 28 Step: See Speed Steps. 128 Step: See Speed Steps. Address 0: Not a valid locomotive address but used to indicate to the Command Station that you wish to control a DC locomotive (ie a locomotive with no Decoder fitted. Only one DC locomotive can usefully be controlled this way, if there is more than one DC locomotive on the track then they will all move at the same time. The command station modifies the DCC Waveform in such a way that the DCC packets can still be understood by decoders but the waveform has a DC offset causing a DC locomotive to move. The waveform is modidfied by making the 0 pulses in the waveform longer than usual and is known as zero stretching. Address: Each DCC Decoder and thus locomotive, in the case of multi-function decoders, has a unique address which is assigned to it during Programming. The default address for a newly purchased (or following factory reset) decoder is short address 3. Addresses can be either short (also known as 2 digit) addresses using 7 bits (see binary) or extended (also known as long or 4 digit) addresses using 14 bits. When counted in decimal, short addresses are valid in the range 1 to 127 but some DCC systems restrict short addressing to the range 1 to 99 leading to them being known as 2 digit addresses. Decimal extended addresses do not use the whole range available in 14 bits and are limited to the range 1 to 10,239 often further restricted by the DCC system to the range 1 to 9,999, or sometimes 100 to 9,999. Address Only Programming: See Programming. Acceleration: Accessory Decoder: See Decoder. Advanced Consist: See Consist. Asymmetric DCC: Automatic Reversing Module: A device used to auutomatically switch the polarity of the DCC track voltage on a reverse loop. As with traditional DC layouts, a problem exists in a DCC layout where a track turns through 180 degrees and connects to itself, resulting in a reverse loop. A short circuit can exist between the two tracks. ??? -reversing section Back EMF: ??? include -speed stabilisation Bit: See Binary. BEMF: See Back EMF. Block Occupancy Detector (BOD): See Occupancy Detector BOD: See Occupancy Detector Brake Generator: Brake on DC: Braking Section: Broadcast Packet: A Packet that will be recognized and acted upon by all Decoders, often used for Broadcast Stop to implement a Braking Section. Broadcast Stop: A Broadcast Packet that instructs all Multi-Function Decoders to bring the motor to a stop subject to Deceleration programmed in CVxxx. Bus: A collection of wires used to distribute electrical signals, usually between more than two points. See also Power Bus, Cab Bus, Loconet, XpressNET. Byte: See Binary Cab: ??? -handheld -tower Conformance Warrant: CV: See Configuration Variable Deceleration: Decoder: ??? -silent drive - supersonic -stationary -mobile -accessory -locomotive -Multi-function Detection Section: See Occupancy Detector Direct Bit Programming: See Programming Direct Byte Programming: See Programming Direct Mode Programming: See Programming Dither: DC: ??? See also Power Conversion DCC: Digital Command Control - What this Glossary is all about! DCC Friendly: Detector: ??? could be -block -transponding -Railcomm Dropper: Short length of wire used to connect the Power Bus to the track at regular intervals. See also How Many Wires?. Emergency Stop: Extended Address: See Address. Feedback: ??? Could be -transponding et, -BEMF -turnout position See also Feedback Bus Feedback Bus: Function: ??? -outputs -mapping Function Decoder: See Decoder. Function Mapping: See Function. Handheld: See Cab. LED: Locomotive Decoder: See Decoder Long Address: See Address. Mobile Decoder: See Decoder Multi-Function Decoder: See Decoder NMRA: POM: Programming on the Main - See Programming. Portescap: Power Bus: The output of a booster is distributed around the layout using two thick, low resistance wires. Connection to the track is made at regular intervals using Track feeds or Droppers. See also How Many Wires?. Power Conversion: ??? See also DC Power Routing Turnout: ??? Not generally a good idea Power Station: See Booster. Programming on the Main (POM): See Programming. Programming Track: See Programming. Programming: ??? -POM -service mode -track -modes PWM: See Pulse Width Modulation. RailCom: Registered trade mark of Lenz Elektronik, GmbH for thier Bi-directional Communication system, based on NMRA RP-9.3.1 Register Mode Programming: See Programming. Reverse Loop: See Automatic Reversing Module. Reversing Section: See Automatic Reversing Module. Reversing Module: See Automatic Reversing Module. Service Mode: See Programming. Short Address: See Address. Signal Influenced Section: Silent Drive Decoder: See Decoder Sound Decoder: Speed Stabilisation: See Back EMF. Supersonic Decoder: See Decoder Stall Current: The current drawn by a motor when it is stalled or prevented from rotating. A Decoder should be capable of handling the stall current of the motor to prevent damage to the decoder in the event of the motor stalling. Stationary Decoder: See Decoder Throttle: Track Feed: See Dropper. Track Voltage: Transformer: A device that converts one AC voltage to another, Usually converting household mains voltage to a lower voltage, e.g. 12V. Transformer is sometimes used to refer to a complete power supply that also rectifies the AC voltage to produces a DC output. Transponding: Uninterruptible Signal Processing: USP: See Uninterruptible Signal Processing. XpressNET: Trade mark of Lenz Elektronik, GmbH for the bus used to interconnect DCC modules such as the command station, cabs and computer interface. XpressNET is absed upon the RS-485 standard and the protocols are freely available to industry and hobbyists. Zero Stretching: See Address 0. |