See Section 3.5, page
In the command line, codes such as <SPACE> or <LF> (line feed) that do not affect player operation are ignored. The length of the command line is limited to the buffer size. For the
When all the commands in a string are completely executed, the player transmits the ÒcompletionÓ message. (It sends an ÒRÓ <CR>.) If an error occurs, an error message such as E04 <CR> is returned by the player. This indicates the error occurrence, along with the error code. See Sec. 3.2 Error Messages, page
The automatic return of an ÒRÓ following command execution is called Automatic Status. Automatic Status is very useful when working with some computer programs, because it allows the program to know the appropriate time to send the next command. If this function is not used, the command processing time must be taken into consideration before the next command is sent. (To set Automatic Status ON or OFF, see the Level III command for Communication Control on page
When an error message is received, it may be necessary to determine the playerÕs current status in order to continue a program. A variety of conditions can occur which may cause an error code to be sent. Since actual hardware failure in the player is a relatively rare event, other conditions may be detected which would allow a program to recover and continue operation. Even when there is no error, there are occasions when player status or disc information is useful. In such a case, the Request Status function can be used.
The user may want to find out the current frame number even if there is no error. Request Status commands can be useful under these conditions. On the
1)To know the active mode of the player: ?P
2)To know the current frame, time, or chapter number for LDs: ?F, ?T, ?C
3)To know the current track, time, block index or
NOTE: These and additional Request commands are described in Section 3.7.4 on page
The status functions are summarized in Figure
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