Pioneer LD-V4400 Level I User Manual page 93

36) PIONEER USER'S CODE REQUEST (Disc ID)
Function: Returns the contents of the Pioneer User's Code.
Format: ?U
Explanation: The Pioneer User's Code is a Pioneer standard and is encoded in
the last 100 frames (200 fields) of lead-in on the videodisc as per
IEC specifications. It is 200 characters in length (one character
for each field) and contains three types of data:
1)
2)
3)
The Key Data area of the Pioneer User's Code Standard can contain
a maximum of 60 characters of disc identifying information
specified by the customer. The Key Data is specially encoded on
the videodisc during the mastering process and is always located
after the Disc Control Data and before the Control Data.
Execution: When the disc is spinning and the player receives the ?U
command it automatically searches to lead-in and returns 200
characters of Pioneer's User's Code, including Key Data (as ASCII
data) encoded in the Pioneer User's Code.
If the disc is in play when this command is sent, the player will
perform the search to lead-in and return the Key Data.
Therefore, it is recommended that this command be issued after
the start (SA) command and before any other player control
command is issued.
If there is no data encoded in the Pioneer User's Code, the player
returns the E04 error code (unavailable command).
If the player experiences an error in reading the data an " ` " (60
HEX) character is returned.
It takes approximately 10 seconds for the player to read this data
from the disc.
LD-V4400 Level I & III User's Manual
LD-V4400 Level I & III • Chapter Four
Disc Control Data - 60 frames (120 fields) 120 characters
Key Data - 30 frames (60 fields) 60 characters
Control Data- 10 frames (20 fields) 20 characters
TP 116 v1.1 • 9/93
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