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ViewSonic CD4220 55
6.3 Remote Control Pass-through mode
When PC sets the LCD monitor to Remote Control Pass through mode, the LCD shall send a three
bytes packet (followed by “CR”) in response to RCU button activation. Note, that in this mode the RCU
shall have no effect on the monitor function. For example: “+Volume” will not change the volume in the
LCD but only sends “+Volume” code to PC over the RS232 port.
Remote Control pass-through packet format from LCD monitor to PC(ASCII)
Name
Length RCU-Code1 RCU-Code2 CR
Byte Count
3 MSB LSB 00D
Bytes order 1 2 3 4
Example: Remote Control pass-through when “Menu” key is pressed (1A)
Name
Length RCU-Code1 RCU-Code2 CR
Byte Count
3 1 A 00D
Bytes order 1 2 3 4
Example: Remote Control pass-through when key “1” is pressed (01)
Name
Length RCU-Code1 RCU-Code2 CR
Byte Count
3 0 1 00D
Bytes order 1 2 3 4
Example: Remote Control pass-through when “OK” key is pressed (1F)
Name
Length RCU-Code1 RCU-Code2 CR
Byte Count
3 1 F 00D
Bytes order 1 2 3 4
Key Code (HEX)
Size 0F
Volume Up (+) 10
Volume Down (-) 11
Mute 12
POWER 15
INPUT 16
PIP ON/OFF 17
MENU 1A
Up 1B
Down 1C
Left(-) 1D
Right(+) 1E
SET 1F
PIP INPUT 00
PIP CHANGE 00
PICTURE MODE 00
AUDIO INPUT 00
SCREEN SAVER GAMMA 00
SCREEN SAVER BRIGHTNESS 00
DISPLAY 00
AUTO SETUP 00
EXIT 00
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