Mitsubishi Electronics MLM400 사용자 설명서

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

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

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.

PROTOCOL
BAUD RATE
DATA LENGTH
PARITY BIT
STOP BIT
FLOW CONTROL

RS-232C
9600 [bps]
8 [bits]
NONE 
1 [bits]
NONE

HEX
ASCII

Address code

30h 30h

'0' '0'

Function code

Function
Function

Data code

Data 
Data

End code

0Dh

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.

[Address code] 
[Function code] 
[Data code]  
[End code]

PC

to RS-232C terminal

RS-232C Cable

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.