Mitsubishi Electronics MLM400 user manual Using the LCD with a Personal ComputerPC

Using the LCD with a Personal Computer(PC)

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

PC

MLM300

to RS-232C terminal

RS-232C Cable

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

PROTOCOL	RS-232C
BAUD RATE	9600 [bps]
DATA LENGTH	8 [bits]
PARITY BIT	NONE
STOP BIT	1 [bits]
FLOW CONTROL	NONE

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		Function code	Data code	End code
HEX	30h 30h		Function	Data	0Dh
ASCII	'0' '0'		Function	Data
	[Address code]	30h 30h (In ASCII code, '0' '0') fixed.
	[Function code]	A code of each fixed control move.
	[Data code]	A code of each fixed control data (number) and not always indicated.
	[End code]	0Dh (In ASCII code, '		' ) fixed.

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.

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