NEC LCD4000e User Manual page 33

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
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
HEX
30h 30h
ASCII
'0' '0'
[Address code]
[Function code]
[Data code]
[End code]
Function code Data code
Function Data
Function Data
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.
RS-232C Cable
End code
0Dh
English-29
to RS-232C terminal