Mitsubishi Electric MH2850U Manual

LCD Projector

MH2850U

Controlling the projector using a personal computer

This projector can be controlled by connecting a personal computer with RS-232C terminal.

PC-controllable functions:

• Turning the power ON or OFF

• Changing input signals

• Inputting commands by pressing the buttons on the control panel and remote control

• Menu setting

Connection

RS-232C cable SERIAL

D-SUB 9-pin D-SUB 9-pin

To RS-232C

terminal

Important:

• Make sure that your computer and projector are turned off before connection.

• Boot up the computer rst, and then plug the power cord of the projector.

(If you do not follow this instruction, the Com port may not function.)

• Adapters may be necessary depending on the PC connected to this projector. Contact your dealer for details.

1) Interface

PROTOCOL RS-232C

BAUD RATE 9600 [bps]

DATA LENGTH 8 [bits]

PARITY BIT NONE

STOP BIT 1 [bit]

FLOW CONTROL NONE

This projector 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 consists of the address code, function code, data code, and end code. The length of the command

varies among the functions.

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’) xed.

[Function code] A code of each xed control move.

[Data code] A code of each xed control data (number) and not always indicated.

[End code] 0Dh (In ASCII code, ‘ ’) xed.

3) Control sequence

(1) Send the command from the personal computer to the projector.

(2) The projector will send a return command after it receives an end code. If the command is not received

correctly, the projector will not send the return command.

(3) The personal computer checks the command and conrms if the sent command has been executed or not.

(4) This projector sends various codes other than the return code. When having a control sequence by RS-232C,

reject other codes from the personal computer.

• During signal switching, the command may not take effect even when the projector sends the return command.

After signal switching completes, wait for the mode indication to disappear before sending the next command.

• When sending commands successively, wait to receive the return command of the current command before

sending a next command.

• Keep intervals of at least 400 ms between receipt of a return command and sending of a next command.

• Any commands will not be executed for 10 seconds after the power is turned on.

[Example] When turning the power ON. (Figures and symbols enclosed in quotation marks are ASCII codes.):

Sending commands

from the PC, etc.

Status code

from the projector

Description

30 30 21 0D

‘0’ ‘0’ ‘!’ ‘ ’

Command for POWER ON

30 30 21 0D

‘0’ ‘0’ ‘!’ ‘ ’

Command receipt conrmation

(Command echo back)

4) Operation commands (Not executable in stand-by mode. When the commands for input select are sent

while the splash screen is being displayed, the splash screen is only canceled.)

The operation commands are used for the basic operation setting of this projector. They may not be executed

while the signals are changed. The operation commands have no data codes.

Operation ASCII HEX Note

POWER ON ! 21h This command is invalid for 1 minute after the power is turned off.

POWER OFF " 22h This command is invalid for 1 minute after the power is turned on.

INPUT COMPUTER 1 _r1 5Fh 72h 31h