Mitsubishi LDT371V User's Manual

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

RS-232C Cable

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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.

1) Interface

'0' '0'

RS-232C

9600 [bps]

8 [bits]

NONE

1 [bits]

NONE

Function code

Function

Data code

Data

End code

0Dh

PROTOCOL

BAUD RATE

DATA LENGTH

PARITY BIT

STOP BIT

FLOW CONTROL

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

For RS-232C cable, the reverse type cable should be used.

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.

Address code HEX

ASCII

30h 30h

[Address code]

[Function code]

[Data code]

[End code]

30h 30h (In 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 600ms.

(2) The LCD monitor will send a return command 600ms* 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’ ’!’ ’

’

Status code from

LCD monitor

30 30 21 0D

’0’ ’0’ ’!’ ’’

Meaning

Command for

WER 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 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 33h

INPUT VIDEO _v1 5Fh 76h 31h

INPUT DVD/HD _v2 5Fh 76h 32h

INPUT S-VIDEO* _v3

5Fh 76h 33h

• 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.

* 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

POWER

Input

Picture mode

Temperature of Internal monitor

ON vP 1 76 50 31 OFF(stand by) vP 0 76 50 30 RGB-1(DVI-D) vI r1 76 49 72 31 RGB-2(D-SUB) vI r2 76 49 72 32 RGB-3(BNC) vI r3 76 49 72 33 Video vI v1 76 49 76 31 DVD/HD vI v2 76 49 76 32 S-VIDEO vI v3 76 49 76 33 HIGHBRIGHT vM p1 76 4D 70 31 STANDARD vM p2 76 4D 70 32

Around Main board

Around

PCB

Powe r

resolution 1˚C

Function Data (Receive) Function Data (Receive)

tc1

tc2

ASCII HEX

(ex.) +25

(ex.) +31

74 63 31 2B 20 32 35

74 63 32 2B 20 33 31

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