Gilderfluke&Co Frequency Shift Keyed/Remote Terminal Unit - Manual (Page 27)

The format of this string is pretty much like that of the startup string, except the F-PLAY command has
been replaced by a STILL command for the LaserDisk player. This freezes the image to whatever the last
image on the video disk was. Other commands are available for blanking out the video, ejecting the disk,
or a variety of other things. You can even build up a string which will tell the LaserDisk player to search for
another frame on the disk and freeze or start playing from that frame. If no command is given to the
LaserDisk player at the end of a LaserDisk show, then the player will continue playing along until the end of
the disk is reached or another command is received.
The REWIND string is the most complex one when operating a LaserDisks or CD player. This is because
this is the string which is used to spin up and locate the disk to the start of all of the shows. An example of
a typical REWIND string to search for frame number 12,345 would be:
‘CLEAR ALL’ <ACK> ‘SEARCH’ <ACK> ‘1’ <ACK> ‘2’ <ACK> ‘3’ <ACK> ‘4’ <ACK> ‘5’
<ACK> ‘ENTER’ <ACK> <Completion> end-o-string
Translated into HEX ASCII, this string becomes (this is what you would enter):
56 8A 43 8A 31 8A 32 8A 33 8A 34 8A 35 8A 40 8A 81 00
The ‘Clear All’ this string starts with is to stop the LaserDisk from processing any other commands it
might already be working on. This is followed by the ‘Motor On’ which will close the door (if needed) and
spin up the disk. The ‘Search’ command is followed by a five digit frame number to search for, and a
‘Enter’ which tells the LaserDisk player to start its search. It returns a Completion acknowledgment that the
LaserDisk will return at the end of the successful completion of the commands.
The following is a partial listing of the commands supported by Sony LaserDisk players. It is by no means
a complete list of all of the commands available to you, but includes those common commands which
you may actually need. Not all Sony players support this full range of commands or respond in the same
way to the commands sent to them. These particular commands are from a LDP-1500’s manual, and so
may not be applicable to all Sony players. The values shown are what you would actually enter into the
strings.
COMMAND HEX CHARACTER SENT POSITIVE RESPONSE
SEARCH 43 (ADDRESS) 40 8A 81
Searches for the frame number that follows the command. Search is started when the
40h is sent. Returns 8A immediately, 81 when task is completed.
CLEAR ALL 56 8A
Clears out any currently digesting command.
AUDIO MUTE ON 3 24 8A
Stops the audio output from the player.
AUDIO MUTE OFF 1 25 8A
Enables the audio output from the player.
CH-1 ON 46 8A
Turns on Audio output from Channel 1 to ‘LEFT’ audio output connector.
CH-1 OFF 47 8A
Turns off Audio output from CH 1 audio. CH 2 audio will go to both outputs if it is still en-
abled.
CH-2 ON 48 8A
Turns on Audio output from Channel 2 to ‘Right’ audio output connector.
CH-2 OFF 49 8A
Turns off Audio output from CH 2 audio. CH 1 audio will go to both outputs if it is still en-
abled.
CLEAR ALL 56
Stops any ongoing command and puts player into STILL mode.
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3 Command not available on all Sony models