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3.7.4 Request Commands
31)
FRAME NUMBER REQUEST
LD
Function: The frame number which is currently being played is returned.
Format: ? F
Explanation: Contents of the current Frame Register are returned.
During playback of a CAV disc, a 5-digit frame number is returned.
During playback of a CLV disc, a 7-digit frame number is returned.
(See Appendix E-1, Notes for details.) Correct values are not shown
if the player is not in Random Access Mode, or if the player is in the
lead-in or lead-out area of a disc.
As seen in the example, continuous frame numbers may not be
received due to timing delays between the computer and the
player. If a frame number code on the disc cannot be correctly
read, the previous value is used. An error (E04) is returned if this
query is sent to the player while a CD is playing.
Execution: * Play Mode (CAV) * Play Mode (CLV)
? F <C/R> 0 2 0 4 4 <C/R> ? F <C/R> 0 010442<C/R>
? F <C/R> 0 2 0 4 5 <C/R> ? F <C/R> 0 010446<C/R>
? F <C/R> 0 2 0 4 5 <C/R> ? F <C/R> 0 010502<C/R>
? F <C/R> 0 2 0 4 7 <C/R> ? F <C/R> 0 010507<C/R>
32)
CHAPTER NUMBER REQUEST
LD
Function: The chapter number which is currently being played is returned.
Format: ? C
Explanation: Contents of the Chapter Number Register are returned.
The chapter number is a 2-digit integer (00-79). Some LaserDiscs
are not encoded with chapter numbers. When playing a disc
without chapters, an error is returned when this request is issued.
Correct values will not be shown if the player is not in Random
Access Mode, or if the player is in the lead-in or lead-out area of a
disc. An error (E04) is returned if this query is sent to the player
while a CD is playing.
Execution: * Play Mode
? C <C/R> 1 2 <C/R>
CLD-V2800 Level III • Chapter Three
CLD-V2800 Level III User’s Manual TP 120 v. 1.0 • 10/95 3-31