NEC LCD4020, LCD4620 user manual English-33

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 isnÕt 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 ( Õ		Õ is for ASCII code)
	Sending commands	Status code from	Meaning
	from the PC	LCD monitor
	30 30 21 0D		Command for
	Õ0Õ Õ0Õ Õ!Õ Õ Õ		POWER ON
		30 30 21 0D	Command received
		Õ0Õ Õ0Õ Õ!Õ Õ Õ	(Command echoed back)

4)Operation commands

The operation commands execute the basic operation setting of this LCD monitor. It may not operate when changing the signal:

English

Operation	ASCII	HEX
POWER ON	!	21h
POWER OFF	"	22h
INPUT DVI	_r1	5Fh 72h 31h
INPUT VGA	_r2	5Fh 72h 32h
INPUT RGB/HV	_r3	5Fh 72h 33h

Operation	ASCII	HEX
INPUT HDMI	_h1	5Fh 68h 31h
INPUT VIDEO*1	_v1	5Fh 76h 31h
INPUT DVD/HD	_v2	5Fh 76h	32h
INPUT S-VIDEO*2	_v3	5Fh 76h	33h
INPUT TV	_t1	5Fh 74h	31h

¥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 ÒS-VIDEOÓ cable connected with the ÒS-VIDEOÓ signal present and selecting ÒPRIORITY MODEÓ. *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			Command from Monitor			Detail of command
30 30 76 50 0D	0''0'v''P'[enter]					Ask about the power status of monitor.
			30 30 76 50	31 0D '0''0''v''P''1'[enter]		Monitor is powered-on.
Structure of the Read-command
					ASCII			HEX
				Function	Data (Receive)		Function		Data (Receive)
POWER	ON			vP	1		76 50		31
	OFF(stand by)			vP	0		76 50		30
	DVI(DVI-D)			vI	r1		76 49		72 31
	VGA(D-SUB)			vI	r2		76 49		72 32
Input	RGB/HV(BNC)			vI	r3		76 49		72 33
	HDMI			vI	h1		76 49		68 31
	Video			vI	v1		76 49		76 31
	DVD/HD			vI	v2		76 49		76 32
	S-VIDEO			vI	v3		76 49		76 33
	TV			vI	t1		76 49		74 31
Picture mode	HIGHBRIGHT			vM	p1		76 4D		70 31
	STANDARD			vM	p2		76 4D		70 32
	Around	resolution 0.5ûC		tcx1	(ex.) +25.0		74 63 78 31		2B	20 32 35 2E 30
	AV board	resolution 1ûC		tc1	(ex.) +25		74 63 31		2B	20 32 35
Temperature	Around	resolution 0.5ûC		tcx2	(ex.) +30.5		74 63 78 32		2B	20 33 30 2E 35
of Internal	Inverter	resolution 1ûC		tc2	(ex.) +31		74 63 32		2B	20 33 31
monitor	PCB
	Around	resolution 0.5ûC		tcx3	(ex.) +30.5		74 63 78 33		2B	20 33 30 2E 35
	Mainboard	resolution 1ûC		tc3	(ex.) +31		74 63 33		2B	20 33 31

NOTE: For complete information please see file ÒExternal_Control_LCD4X20.pdfÓ on the CD-ROM.

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