LD-V4400 Internal Player Controls
F-4
TP 116
v1.1 • 9/93
Appendix F LD-V4400 Internal Player Controls
Independent Command Processor
The LD-V4400 player can be controlled by several different methods: From the Front
Panel Buttons, the Remote Control Unit or LaserBarcode Reader (Level I) or from an
external computer via the RS-232 port (Level III).
An independent command processor inside the player assures the most appropriate
operating environment is used. Because of this, the same commands may perform
differently, depending on the control method. See
Chapter 3 Manual Control
for
Level I player control using Front Panel buttons,
Section 3.1
; using a Remote Control
Unit,
Section 3.2
; or using the LaserBarcode Reader,
Section 3.3
and
Appendices B,
D
and
E.
See
Chapter 4 External Computer Control
for sending commands from
an external computer.
Most of the commands input to the player have arguments such as frame number,
chapter number, time code or various parameters. An argument storage area and
an address flag indicating the frame, time, or chapter number are provided for each
control method. Therefore, arguments input for one particular control method do
not affect operations performed with another method.
Internal Player Components
(See Block Diagram of Internal Registers, p. F-7)
Address Specification Flag Register (computer control)
This register indicates whether a particular address argument sent from a
computer is a frame number, time code, or chapter number.
Serial Digit Buffer (computer control)
This buffer stores the numeric values of arguments sent from an external
computer. The contents of this buffer are sent to the specified registers for
command execution.
Command Processor (computer control)
This processor reads the contents of the RS-232C buffer. It sends the
arguments to the digit buffer, or executes commands.
RS-232C Buffer
This is the RS-232C Input/Output data buffer. Twenty-two bytes are used
for input and another 22 bytes are used for output.
Address Specification Flag Register (manual control)
This register indicates whether the address arguments are frame numbers,
time numbers, or chapter numbers for normal control operations.
Digit Buffer (manual control)
This buffer stores the numeric values of arguments for normal control
operations. The contents of this buffer are sent to the specified register for
command execution.
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