NEC PlasmaSync 42VM5 Supplementary Manual page 6

Data Portion Contents
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DATA00 05H : User Sound Gain Flag
DATA01 01H : Volume Gain Flag
Command example:
* Setting Volume to "10"
DFH 80H 60H 7FH 02H 05H 01H 46H
005. AUDIO MUTE ON
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Function:
This command mutes the sound.
Command:
9FH 80H 60H 3EH 00H CKS
Response: At the time of a success
3FH 60H 80H 3EH 00H CKS
Supplement:
* Sound mute is cancelled for the following:
Input connector switching
Video signal switching
Volume adjustment
006. AUDIO MUTE OFF
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Function:
This command cancels the sound muting.
Command:
9FH 80H 60H 3FH 00H CKS
Response: At the time of a success
3FH 60H 80H 3FH 00H CKS
007. CONTRAST GAIN DATA
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Function:
This command controls the Contrast gain of the picture.
Command:
DFH 80H 60H 7FH 03H DATA00 DATA01 DATA02 CKS
Data Portion Contents
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DATA00 01H : User Picture Gain Flag
DATA01 07H : Contrast Gain Flag
DATA02 Contrast Gain
CCH : -52
:
FFH : -01
00H : 0