MITSUBISHI ELECTRIC MDT552S - Manual (Page 46)

English-42
U-12 Remote control
Carry out as necessary
RS-232C Remote control
When the monitor is connected directly to a computer using an RS-232C cable (commercially available), the following operations
can be controlled via a communication. Select the communication interface (RS-232C) used for the serial communication function.
(See page 54.)
• 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
BAUD RATE 9600 [bps]
DATA LENGTH 8 [bit]
PARITY BIT NONE
STOP BIT 1 [bit]
FLOW CONTROL NONE
• For direct connection using RS-232C, use the RXD, TXD, and GND lines.
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 send commands with a keypad using terminal software, select “2s” or “30s” for CONTROL TIME OUT in
CONFIGURATION2 in the OSD menu. (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 (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 the end code. If the monitor fails to receive the
command, it doesn’t send any return command. (*During the power-on/off or input selection process, the transmission of the
return command may take more than 600 ms.)
(3) The computer checks the return command to see whether the command it sent was received or not. The computer must
receive the return command before sending the next command.
(4) The monitor sends various codes other than commands including the return command. While RS-232C control sequence is
in progress, the computer must reject the codes.
Example: Turn the power ON (‘ ’ is for ASCII code)
Control command from
computer
Return command from
monitor to computer
Description of command
30 30 21 0D
‘0’ ‘0’ ‘!’ ‘ ’
Sending a command for
power-on
30 30 21 0D
‘0’ ‘0’ ‘!’ ‘ ’
Command received
(Command echoed back)