English-36
U-11
Remote control
Carry out as necessary
RS-232C/RS-485 Remote control
By connecting multiple LCD monitors and a computer using RS-232C cables (commercially available) or CAT5 cables (commercially
available), you can control the monitors from the computer via the supplied CAT5 Tx BOX for the following operations:
• Power ON or OFF
• Switching between input signals
• Volume control and mute
• Auto
setup
• Check of the internal temperature of the monitor, etc.
NOTE:
For connection with a 25-pin serial port connector on the computer, a conversion adapter (commercially available) is required.
1) Interface
PROTOCOL
RS-232C/RS-485 (CAT5)
BAUD RATE
9600 [bps]
DATA LENGTH
8 [bit]
PARITY BIT
NONE
STOP BIT
1 [bit]
FLOW CONTROL
NONE
• For RS-232C, use RXD, TXD and GND lines (full-duplex).
• For RS-485, use RXD, TXD, RTS, DTR and GND lines in USB or RS-232C connection with the CAT5 Tx BOX (half-duplex).
When you create the control program, using RTS and DTR in the transmit control of the negative logic, determine the sending
of TXD and the hold time of up to 70 ms as the “sending” and then switch the control to the “receiving.”
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.
NOTE:
• This example shows a basic command that is used when a single computer and a single monitor are connected.
When you want to connect multiple monitors or perform complicated control using other commands than the basic
commands, contact your dealer for advanced command specifi cations.
• To use terminal software, send a text fi le with control commands. The monitor is not compatible with the sending of
commands using a keypad. (Follow the same procedure for LAN control.)
Address code
Function code
Data code
End code
HEX
30h 30h
Function
Data
0Dh
ASCII
‘0’ ‘0’
Function
Data
[Address code]
30h 30h (ASCII code, ‘0’ ‘0’), fi xed.
[Function code]
Code unique to each control function.
[Data code]
Data unique to each control function (Not always indicated by numerical values.)
[End code]
0Dh (In ASCII code, ‘
’) fi xed.
3) Control
sequence
(1) A command is sent from the computer to the monitor. (Commands should be sent at intervals of at least 600 ms.)
(2) The monitor sends a return command within 600 ms* after receiving and encoding the command. If the monitor fails to
receive the command, it doesn’t send any return command.
(3) The computer checks the return command to see that the command it sent was executed or not.
(4) The monitor sends various codes other than the return code. While RS-232C control sequence is in progress, reject other
codes on the personal computer side.
*: Transmission of the return command may be delayed during signal switchover, etc.
Example: Turn the power ON (‘ ’ is for ASCII code)
Command from computer Command from monitor
Detail of command
30 30 21 0D
‘0’ ‘0’ ‘!’ ‘
’
Command for POWER ON
30 30 21 0D
‘0’ ‘0’ ‘!’ ‘
’
Command received
(Command echoed back)
For RS-485, both of DTR and RTS lines remain Active Low while the TXD command is sent from the computer.
