NEC LCD4000e User Manual page 34

Using the LCD with a Personal Computer
3) Control sequence
(1) The command from a personal computer to the LCD monitor will be sent in 400ms.
(2) The LCD monitor will send a return command 400ms* after it has received an encode. If the command isn't
received correctly, the LCD monitor will not send the return command.
(3) The personal computer checks the command and confirms if the command which has been sent has been
executed or not.
(4) This LCD monitor sends various codes other than return code. When having a control sequence by RS-232C,
reject other codes from personal computers side.
*: The sending time of return command may delay depending on the condition (during changing of the
input signal, etc.).
[Example] Turn the power ON ( ' ' is for ASCII code)
Sending commands
from the PC etc.
30 30 21 0D
'0' '0' '!' ' '
4) Operation commands
The operation commands execute the basic operation setting of this LCD monitor.
It may not operate when changing the signal:
Operation
POWER ON
POWER OFF
INPUT RGB 1
INPUT RGB 2
INPUT RGB 3
INPUT VIDEO
INPUT DVD/HD
• POWER OFF command should be operated over1 minute after the power is turned on.
• POWER ON command should be operated over 1 minute after the power is turned off.
NOTE: For complete information please see file "External_Control_LCD4000e.pdf" on the CD-ROM.
Status code from LCD
monitor
30 30 21 0D
'0' '0' '!' ' '
HEX
ASCII
! 21h
" 22h
_r1 5Fh 72h 31h
5Fh 72h 32h
_r2
5Fh 72h 33h
_r3
_v1 5Fh 76h 31h
_v2 5Fh 76h 32h
English-30
Meaning
Command for POWER ON
Command received
(Command echo back)
–continued