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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
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.
* In order to function, the RS-232C OUT terminal can only be connected to another monitor of the same model.
Do not connect to other types of equipment.
The following control sequence is used for a single LCD4020/LCD4620. To control multiple LCD4020/LCD4620 monitors that
are daisy-chained together please use the extended control command. Instructions for the extended control command can be
found on the CD included with the display. The file is called “External_control_LCD4X20.pdf”. When using the following
control commands, all of the daisy-chained monitors can be controlled at the same time from one monitor. Reply and status
commands, however, will only pertain to the primary monitor, not secondary monitors.
1) Interface
This LCD monitor uses RXD, TXD and GND lines for RS-232C control.
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] 30h 30h (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.
PROTOCOL RS-232C
BAUD RATE 9600 [bps]
DATA LENGTH 8 [bits]
PARITY BIT NONE
STOP BIT 1 [bits]
FLOW CONTROL NONE
Address code Function code Data code End code
HEX 30h 30h Function Data 0Dh
ASCII '0' '0' Function Data
RS-232C Cable
PC
(Out)
RS-232C Cable
RS-232C (OUT)
MultiSync
RS-232C (IN)RS-232C (OUT)RS-232C (IN)
IN OUT
MultiSync MultiSync