indicator to illuminate steady. The indicator
multiplex system (DMS), however, is functionally
extinguishes when the alarm condition has
integrated with the MCS where all consoles
cleared.
depend upon the DMS for input data and for a
communications link.
NUMERICAL KEYPAD.--The numerical
keypad (C) is used to select the firemain valve to
DMS SYSTEM
be controlled. As the keys are pressed, the
corresponding digits are displayed on the digital
The DMS is a general-purpose, user-oriented,
indicator.
electronic information transfer system that
provides data transfer for the major systems
VALVE CONTROLS.--The valve control
aboard the DDG-51 class ship. The DMS conveys
push buttons (D) are labeled OPEN and CLOSE.
data from shipboard subsystems such as naviga-
Once a valid valve number is entered into
tion, damage control, and machinery control.
the digital display, an automatic display of
Instead of using conventional multiple hard-
the valve position results on the associated
wired signal cables unique to each major
open and close push buttons. An invalid number
system, the DMS sends the signals over general-
will cause the level display on the digital
purpose multiplex cables. These cables are
indicator to flash and OPEN or CLOSE will
installed at locations in the ship that allow
not light. Depressing the OPEN or CLOSE push
continued DMS operation even when the
button causes the valve to cycle to the desired posi-
ship is damaged during combat conditions. The
tion. The appropriate OPEN/CLOSE push but-
redundancy that is designed into the DMS
ton illuminates to show the position of the valve.
system reduces the chance that data transfers
will be lost because of a single-point failure.
LAMP TEST.--Depressing the LAMP TEST
The DMS interfaces with the MCS consoles
push button (E) illuminates all the lights on the
to provide console-to-console communications.
RSC. This allows the operator to determine which
The DMS also provides control and status
bulbs need replacement. Releasing the LAMP
of equipment in the machinery plant, including
TEST push button completes the test and
damage control equipment.
extinguishes the lamps.
DMS INTERFACES
Bubble Memory Section
Six consoles in the MCS have AN/UYK-44
Located on the right side of the sloping
computers that interface with the DMS network.
They are the SCU-1, SCU-2, PACC, EPCC,
panel is the bubble memory system. A detailed
description of the bubble memory system was
RSC, and EOOW/logging consoles. These
presented in chapter 7.
interfaces are dual channel with a primary
and alternate channel. Each channel has its
own cable that connects between the con-
sole and the input-output unit (IOU) of the
Plasma Display Keyboard
DMS.
The final section of the DCC contains the
plasma display keyboard. All plasma display
There are two interfaces of MCS equipment
that are not computer interfaces. The panels in
keyboards in the MCS are identical. A detailed
the SCC and the WDCM panel connect to an
description of the plasma display keyboard was
presented in chapter 7.
input-output module in the DMS IOU. The
communication protocol for this type of interface
is different from that of the AN/UYK-44
computer.
DATA MULTIPLEX SYSTEM
The DMS provides the means of transferring
information between consoles, for collecting data
The ship's propulsion plant, electric plant, and
on the operating machinery monitored by the
damage control system are considered to be
MCS, and for controlling equipment remotely
associated equipment of the MCS. The data
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