| Word | Description |
|---|---|
| Daisy Chain | A wiring plan in which each device may be connected through other devices to the controller. |
| DC or Direct Current | An expression used to describe an electrical wave form in which the voltage remains more or less at a value above or below 0 volts. The wave form used by most model railroad locomotives. Sometimes referred to as Analog. |
| Deceleration | The rate at which the decoder decreases from one speed step to the next in response to a new decrease speed command. Use CV04 to set up the deceleration value for each decoder. This feature is used to simulate train momentum so that, just like the prototype, your model won't stop immediately when the brakes are applied. |
| Decoder Adress | The unique number assigned by the user to a particular mobile or stationary decoder. The DCC system uses the decoder address to send commands to the appropriate loco or accessory. |
| Decoders, Mobile | The electronic device installed in each locomotive that receives the signal from the command station through the track, decodes it & tells the loco what to do. |
| Decoders, Stationary (Accessory) | The electronic device for the switches or other accessories that receives the signal from the command station through the track, decodes it & tells the switch/accessory what to do. |
| Decoder Status | A DCC decoder can be New, In-Use, Common, or Idle in a Digitrax system. |
| Detection Section | A section of track gapped on one or both rails and connected to an occupancy detector. |
| Digital Command Control (DCC) | Digital command control. On the most basic level, DCC encompasses systems and products that are interoperable with the basic DCC industry norms and practices ( Some of the NMRA's Standards and RPs define the basic protocols). DCC is incorporated with other related technologies to create systems that controls locomotives and layout components. |
| Direct Home Wiring | A wiring system in which the DCC booster powers each rail through an individual conductor or wire. Each booster is wired to it's own power section and there is no common connection between boosters. This is the Digitrax recommended wiring system. |
| Directional Lighting | Loco lights can be set up to automatically change so that the forward lamp is lit when the loco is moving forward and the reverse lamp is lit when moving in reverse. |
| Direct Programming | A type of service mode programming. |
| Dispatching | Use your DT Throttle to set up a loco or consist you want to be run by an operator on a Utility throttle (or BT2 Buddy throttle) and then using couple of keystrokes, dispatch the loco from the DT Throttle and acquire it on the Utility Throttle or BT2. This feature may also be used by operators who wish to use a fairly strict dispatch discipline in their operating sessions. |
| Display Active | With the DT Throttle you can control two different addresses at the same time, one on the Left Throttle and another on the Right Throttle. Because only one throttle's data can be displayed on the LCD screen at a time, we use the direction indicator to indicate which side is currently "display active". The "display active" throttle is the one with the flashing indicator. |
| Ditch Lights | Prototype lights that are mounted on a loco's pilot or low on the hood to illuminate each side of the track just in front of the loco. When the horn is sounded, they flash alternately increasing the visibility of the loco, especially at grade crossings. Digitrax decoders with FX lighting simulate this effect beautifully by using two separate function leads. |
| DPDT | Double Pole Double Throw Switch |
| Droop | The slope of the graph of speed vs. load for a loco. This variable is used to calculate speed corrections made when scaleable speed stabilization is used to manage the effects of load on the loco's speed. |