NEC MultiSync LCD4020, LCD4620 User Manual page 35

3) Control sequence
(1) The command from a computer to the LCD monitor will be sent in 400ms.
(2) The LCD monitor will send a return command 400ms* after it has received and encoded. 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
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 ASCII
POWER ON !
POWER OFF "
INPUT DVI _r1
INPUT VGA _r2
INPUT RGB/HV _r3
• POWER OFF command should be operated over 1 minute after the power is turned on.
• POWER ON command should be operated over 1 minute after the power is turned off.
1
* S-VIDEO is enabled by having the "S-VIDEO" cable connected with the "S-VIDEO" signal present and selecting "PRIORITY MODE".
* 2 S-VIDEO is SEPARATE only.
5) Read command
Host computer sends the command without Data-code to monitor.
After receiving this command, the monitor returns the command with Data-code of current status to host computer.
< ex. > When Host computer ask Power status of monitor, the status of monitor is powered-on.
Command from computer
30 30 76 50 0D 0''0'v''P'[enter]
Structure of the Read-command
ON
POWER
OFF(stand by)
DVI(DVI-D)
VGA(D-SUB)
Input
RGB/HV(BNC)
HDMI
Video
DVD/HD
S-VIDEO
TV
HIGHBRIGHT
Picture mode
STANDARD
resolution 0.5˚C tcx1
Around
AV board
resolution 1˚C
resolution 0.5˚C tcx2
Around
Temperature
Inverter
of Internal resolution 1˚C
PCB
monitor
resolution 0.5˚C tcx3
Around
Mainboard
resolution 1˚C
NOTE: For complete information please see file "External_Control_LCD4X20.pdf" on the CD-ROM.
Status code from
LCD monitor
30 30 21 0D Command received
(Command echoed back)
'0' '0' '!' ' '
HEX Operation
21h INPUT HDMI
22h INPUT VIDEO*
5Fh 72h 31h INPUT DVD/HD
5Fh 72h 32h INPUT S-VIDEO*
5Fh 72h 33h INPUT TV
Command from Monitor
30 30 76 50 31 0D '0''0''v''P''1'[enter]
ASCII
Function Data (Receive)
vP 1
vP 0
vI r1
vI r2
vI r3
vI h1
vI v1
vI v2
vI v3
vI t1
vM p1
vM p2
(ex.) +25.0
tc1 (ex.) +25
(ex.) +30.5
tc2 (ex.) +31
(ex.) +30.5
tc3 (ex.) +31
English-33
Meaning
Command for
POWER ON
ASCII HEX
_h1 5Fh 68h 31h
1 _v1 5Fh 76h 31h
_v2 5Fh 76h 32h
2
_v3 5Fh 76h 33h
_t1 5Fh 74h 31h
Detail of command
Ask about the power status of monitor.
Monitor is powered-on.
Function
76 50
76 50
76 49
76 49
76 49
76 49
76 49
76 49
76 49
76 49
76 4D
76 4D
74 63 78 31
74 63 31
74 63 78 32
74 63 32
74 63 78 33
74 63 33
HEX
Data (Receive)
31
30
72 31
72 32
72 33
68 31
76 31
76 32
76 33
74 31
70 31
70 32
2B 20 32 35 2E 30
2B 20 32 35
2B 20 33 30 2E 35
2B 20 33 31
2B 20 33 30 2E 35
2B 20 33 31