NEC LCD4000 - Manual (Page 33)

English-31
English
3) Control sequence
(1) The command from a computer to the LCD monitor will be sent within 400ms.
(2) The LCD monitor will send a return command 400ms* after it has received and executed a code. If the command isn’t
received correctly, the LCD monitor will not send the return command.
(3) The computer checks the command and confirms if the command which has been sent has been executed or not.
(4) The LCD monitor sends various codes other than the return code. When using the control sequence via RS-232C,
rejection of other codes from computer side is required.
*: The sending time of return command may delay depending on the condition (during changing the input signal, etc.).
Example: Turn power ON (Corresponding ASCII code in ' ' )
4) Operation commands
The operation commands execute the basic operation setting of the LCD monitor.
It may not operate when changing the signal:
• POWER OFF command will not work for 1 minute after the power is turned on.
• POWER ON command will not work for 1 minute after the power is turned off.
Operation ASCII HEX
POWER ON ! 21h
POWER OFF " 22h
INPUT RGB 1 _r1 5Fh 72h 31h
INPUT RGB 2 _r2 5Fh 72h 32h
INPUT RGB 3 _r3 5Fh 72h 32h
INPUT VIDEO _v1 5Fh 76h 31h
INPUT DVD/HD _v2 5Fh 76h 32h
Sending commands
from computer
Status code from
LCD monitor
Meaning
30 30 21 0D
'0' '0' '!' ' '
30 30 21 0D
'0' '0' '!' ' '
Command received
(Command echoed back)
Command for
POWER ON