DCS Command System User’s Guide
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Glossary
AIU: Accessory Interface Unit. Unit that receives digital command signals from a TIU
for remote accessory and switch (turnout) control.
Banana Plug: Male plug with bowed slats. Tension in the slats creates force that holds
banana plug in place within a banana jack (female plug).
Command Mode: Mode of operation in which digital signals, as opposed to track volt-
age changes, control engines. Track voltage is constant (usually set ~18V). Command
Mode operation controls an individual engine or engines as opposed to controlling all
engines on a given track.
Conventional Mode: Mode of operation in which track voltage changes (including
short DC offset signals) control a track. In conventional mode operation, all engines on
a given track are controlled simultaneously.
DCS: Digital Command System. System of one or more Proto-Sound 2.0 engines, DCS
remote control, TIU, AIU (optional), operating software, and the protocols by which they
communicate.
Engine Address: In DCS, numerical assignment given to each engine or consist. When
DCS engines are added to the system, they are assigned to the next available position in
the engine list. The Engine Address number (and not the alphabetical or alphanumeric
engine name) is the means by which the DCS system distinguishes between DCS engines.
Engine Name: In DCS, alphabetical name given to each engine. Each DCS model type
is factory-programmed with a different Engine Name (e.g. all RailKing GG-1’s are named
“RK GG-1”). Engine Name may be reprogrammed up to 16 characters (as would be
desired to distinguish between multiple engines of the same type operating on the same
DCS system).
Fixed Voltage: In both “FIXED VOLTAGE/IN 1” and “FIXED VOLTAGE/IN2”
channels of the TIU, ‘FIXED VOLTAGE’ means that the input voltage to the TIU
channel = output voltage from the TIU channel. For example, the voltage into “FIXED
VOLTAGE IN2” channel terminals will always be equal to the voltage out of “FIXED
(DCS) OUT2” channel terminals.
Legacy Mode: DCS feature that turns off speed control on PS-2 engines.
RJ-11: Designation for 4-conductor (wire) “telephone” type plug and socket. Used in
DCS system for fixed tether between DCS remote and TIU.
RJ-12: Designation for 6-conductor (wire) “telephone” type plug and socket. Used in
DCS system for connecting TIU to AIU and AIU to AIU. Each AIU purchase includes
one RJ-12 cable.
Rocker Button: Three DCS remote buttons that momentarily activate one of two
options of the “CHUFF/REV”, “BOOST/BRAKE”, and “CPR-F/CPR-R” functions.
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