Controlling the LCD monitor via RS-232C Remote Control. NEC MultiSync® LCD4620 DST Touch, 4620, LCD4020, MultiSync® LCD4620, 4020, LCD4620, MultiSync LCD4020, MultiSync® LCD4020, LCD4020, LCD4620, MultiSync® LCD4020 DST Touch

Controlling the LCD monitor via RS-232C Remote Control

This LCD monitor can be controlled by connecting a personal computer with a RS-232C terminal.

Functions that can be controlled by a personal computer are:

• Power ON or OFF

• Switching between input signals

Connection

LCD Monitor + PC MultiSync MultiSync

PC

(Out)

IN OUT RS-232C (IN) RS-232C (OUT) RS-232C (IN) RS-232C (OUT)

RS-232C Cable RS-232C Cable

MultiSync

NOTE: If your PC (IBM or IBM compatible) is equipped only with a 25-pin serial port connector, a 25-pin serial port adapter is required. Contact your dealer for details.

* In order to function, the RS-232C OUT terminal can only be connected to another monitor of the same model.

Do not connect to other types of equipment.

The following control sequence is used for a single LCD4020/LCD4620. To control multiple LCD4020/LCD4620 monitors that are daisy-chained together please use the extended control command. Instructions for the extended control command can be found on the CD included with the display. The file is called “External_control_LCD4X20.pdf”. When using the following control commands, all of the daisy-chained monitors can be controlled at the same time from one monitor. Reply and status commands, however, will only pertain to the primary monitor, not secondary monitors.

1) Interface

PROTOCOL

BAUD RATE

DATA LENGTH

PARITY BIT

RS-232C

9600 [bps]

8 [bits]

NONE

STOP BIT 1 [bits]

FLOW CONTROL NONE

This LCD monitor uses RXD, TXD and GND lines for RS-232C control.

2) Control command diagram

The command is structured by the address code, function code, data code and end code. The length of the command is different for each function.

HEX

ASCII

Address code Function code

30h 30h Function

'0' '0' Function

Data code

Data

Data

End code

0Dh

[Address code]

[Function code]

[Data code]

[End code]

30h 30h (ASCII code, '0' '0'), fixed.

A code of each fixed control move.

A code of each fixed control data (number) and not always indicated.

0Dh (In ASCII code, ' ') fixed.

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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

Status code from

LCD monitor

30 30 21 0D

’0’ ’0’ ’!’ ’ ’

30 30 21 0D

’0’ ’0’ ’!’ ’ ’

Meaning

Command for

POWER ON

Command received

(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:

Operation

POWER ON

POWER OFF

INPUT DVI

INPUT VGA

INPUT RGB/HV

!

ASCII HEX

21h

"

_r1

_r2

_r3

22h

5Fh 72h 31h

5Fh 72h 32h

5Fh 72h 33h

Operation

INPUT HDMI

INPUT VIDEO*

INPUT DVD/HD

1

INPUT S-VIDEO* 2

INPUT TV

ASCII

_h1

_v1

_v2

_v3

_t1

HEX

5Fh 68h 31h

5Fh 76h 31h

5Fh 76h 32h

5Fh 76h 33h

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 “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]

Command from Monitor Detail of command

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

POWER

Input

Picture mode

Temperature of Internal monitor

ON

OFF(stand by)

DVI(DVI-D)

VGA(D-SUB)

RGB/HV(BNC)

HDMI

Video

DVD/HD

S-VIDEO

TV

HIGHBRIGHT

STANDARD

Around

AV board vM resolution 0.5˚C tcx1 resolution 1˚C tc1 resolution 0.5˚C tcx2 Around

Inverter

PCB resolution 1˚C tc2 resolution 0.5˚C tcx3

Around

Mainboard resolution 1˚C tc3 vI vI vI vI vM vI vI vI vI

Function vP vP v3 t1 p1 r3 h1 v1 v2

ASCII

Data (Receive)

1

0 r1 r2 p2

(ex.) +25.0

(ex.) +25

(ex.) +30.5

(ex.) +31

(ex.) +30.5

(ex.) +31

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

NOTE: For complete information please see file “External_Control_LCD4X20.pdf” on the CD-ROM.

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

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