NEC NP-M311W Command Manual page 26

DATA03 : 00H (direct settings)
01H (increment/decrement)
DATA04 : lower data (8bit)
DATA05 : upper data (8bit)
ex.1) volume direct setting (value = 20)
DATA01 : 05H (Volume)
DATA02 : 00H ("Volume" only)
DATA03 : 00H (direct setting)
DATA04 : 14H (lower data : 20 = 0014<Hex>)
DATA05 : 00H (upper data : 20 = 0014<Hex>)
ex.2) brightness increment (value = +1)
DATA01 : 00H (Brightness)
DATA02 : FFH (except "Volume")
DATA03 : 01H (increment/decrement)
DATA04 : 01H (lower data : +1 = 0001<Hex>)
DATA05 : 00H (upper data : +1 = 0001<Hex>)
ex.3) contrast decrement (value = -1)
DATA01 : 01H (Contrast)
DATA02 : FFH (except "Volume")
DATA03 : 01H (increment/decrement)
DATA04 : FFH (lower data : -1 = FFFF<Hex>)
DATA05 : FFH (upper data : -1 = FFFF<Hex>)
030-2. VOLUME ADJUST
**********************************************************************
Function:
This command sets the volume.
Command:
03H 10H 00H 00H 05H DATA01 .. DATA05 CKS
Data Portion Contents
-------------------------------------------------------------------
DATA01 05H fixed
DATA02 Setting items
00H : Volume
01H : Bass
02H : Treble
03H : Balance
DATA03 Setting mode
00H : Absolute value specification
01H : Relative value specification
DATA04 Setting Value (Lower ranking 8 bits)
DATA05 Setting Value (Upper ranking 8 bits)
Response: At the time of a success
23H 10H 01H xxH 02H DATA01 DATA02 CKS
(*1) (*2)
Data Portion Contents
(*3)
(*3)