NEC MultiSync LCD4020, User Manual

Page: 43 / 54

English
English-37
Using the LCD with RS-232C
- continued
The following control sequence is used for a single MultiSync display.
When using the following control commands, all of the daisy-chained monitors can
be controlled at the same time from the primary monitor. However, reply and status
commands will only pertain to the primary monitor, and not to the secondary moni-
tors.
1) Interface
PROTOCOL RS-232C
BAUD RATE 9600 [bps]
DATA LENGTH 8 [bits]
PARITY BIT NONE
STOP BIT 1 [bit]
FLOW CONTROL NONE
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.
To control multiple MultiSync monitors that are
daisy-chained together please use the extended
control command. Instructions for the ex-
tended control command can be found on the
CD included with the display. The file is called
“External_control.pdf ”.