NEC LCD4000 manual Using the LCD with a Personal ComputerPC, fixed

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

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.

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