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Slot Dictionary

Summary:A Digitrax term referring to address management by a Digitrax DCC system.

DCC Terms
DCC Components	Accessory Decoder, Auto Reverse, Command station, Computer Interface, Consists, DCC Booster, DCC Ready, Decoder, Digital Packet, How Digital Command Control Works, Multifunction Decoder, Power Supply, Speed Steps, Throttle, XPressNet
General	Address Partitioning, Ammeter, Analog Control of Model Railroads, Bus, Cab, Can Motor, Command Control, Coreless Motors and DCC, DCC, DCC in a Box, DMM, Distributed Power, Frog Juicer, Jump Port, LCC, Layout Command Control, Locomotive, Motor, Multiple Unit Consisting, Original Equipment Manufacturer, Phase, Power Bus, Programming Track, Pulse Width Modulation, Rail Size, Serial User System Interface - SUSI, Slots, Standard Dimensions, Turnout Motors, Turnouts with Digital Command Control, Voltage Drop, Zero Stretching
Mobile decoder	Analog Conversion, Back EMF, Decoder Connection Method, Digitrax Transponding, Ditch Lights, Dither, Energy Storage, FX Lighting, Functions, High-Frequency Decoders, Kick Start, Lenz USP, Lighting Effects, Locomotive Interface, Momentum, Multifunction Decoder Assisted Consisting, NMRA Connector, NMRA DCC Plug for Multifunction Decoders, Power Conversion, Programming Lock, Programming Modes, Quartering, Silent Drive, Snood, XOR
Non-DCC	Continuous Load, FRED, Heat Shrink Tubing, Magic Smoke, RJ12 Connector, Rule 17, Series Resistor, Stall Current
Boosters ·Command Station ·Decoder ·Power Supply ·Throttles/Cabs

Short Definition

A Digitrax term to refer to an address management for locomotives under control by a Digitrax system.

1What are Slots?
- 1.1Slot Status
  - 1.1.1What Does it Mean?
- 1.3Slots = MAX Warning
  - 1.3.1Additional Information about the Slots = Max Warning
  - 1.3.2Clearing the Slots
- 1.4Managing the Slots
- 1.7Purging Made Easy
- 1.9Slot Following

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What are Slots?

Slots are a concept used in Digitraxcommand stations. The number of slots available determine how many locomotives you can operate.

The concept is similar to that of a 'heap' used in Computer Science: It is a portion of memory set aside by the program you are running to store variables and frequently used data. In this case, locomotiveaddresses and consist information is stored by the command station's software for use later. Different Digitrax command stations have different amounts of memory available for slots, in the case of the Chief line, the number of slots available can be defined by changing a setting in the command station. The Advanced command stations feature Expanded Slots.

The Zephyr has ten and Zephyr Xtra features 20 slots. The Empire Builder has 22. The Chief and Super Chief have 120 slots. See the Digitrax Command Station Comparison for more info.

Slot Status

A slot can in in one of four states:

In Use: The slot has an assigned throttle, and the command station is sending commands to the track
Common: Commands are being sent; No throttle assigned
Idle: The command station is ignoring this slot, no commands are being sent related to this slot.
Free: Slot is empty or has not been assigned or used. A computer running software can also clear slots.

Any slot while in use which does not receive updates from its associated throttle after a period of time may be marked as Common or Idle. If a slot's status is Common and the speed is set to Zero, the slot may be purged by the command station at a later point in time.

If the command station does not receive LocoNet messages in a timely manner due to corrupt messages or other activities demanding time, slots may be set to Common.

What Does it Mean?

Common

A slot labelled Common is being refreshed by the command station, and will not be available for use with another address. An excessive number of common status slots is often a result of operator discipline, or lack thereof. With proper discipline the number of slots with common status can be managed.

Releasing an address sets the status of that slot to common.

If an operator inadvertently selects an incorrect address, that address should be dispatched before a new address selection is attempted. If a new address is entered without dispatching the prior one, the first address will have its slot changed to common. By using Dispatch, the slot is made idle and available for use

Idle

This slot is available for re-assignment to a new address. By using Dispatch the status of the slot is changed to Idle, instead of common.

UniVersal Consists

UniVersal Consisting is the default Digitrax consisting method. Addresses in a consist remain in common status until the address(es) are removed from the consist. This ensures addresses are not removed inadvertently from a consist by reuse of their slot.

Purge

Any address which is permitted to Purge will have its slot status changed to common.

Clearing Slots

It is possible to manually clear slots using the throttle, the typical procedure with an advanced throttle is to select the locomotive address and press EXIT. This is not the same as Dispatching.

Slots = MAX Warning

This warning indicates the maximum number of slots available (or memory set aside for this) has been reached. Until they are cleared out, this message will persist. This can be done using an option switch (see your manual) or JMRI's LocoNet tools.

The main cause of this warning is locomotives which were not dispatched by their operator after an operating session.

Additional Information about the Slots = Max Warning

On a DT400 or DT300, the display will show Slot=Max. Older DT100 or DT200 throttles will display FF, and the Zephyr shows FULL<

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