2. Control command configuration

The command consists of the address code, function code, data code, ACK/NAK, and end code. The length of the com- mand varies among the functions.

 

 

 

Address code

 

Function code

 

Data code

 

ACK/NAK

 

End code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ASCII

 

‘30h’ ‘30h’

 

 

Function

 

Data

 

‘3Ah’ ‘4Eh’

 

‘0Dh’

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Character

 

00

 

 

Function

 

Data

 

:N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[Address code]

 

Fixed to 00. (‘30h’ ‘30h’ in the ASCII code)

 

 

 

 

[Function code]

 

Code unique to each control operation.

 

 

 

 

 

[Data code]

 

Data (value) unique to each control operation (Not always indicated.)

 

[ACK/NAK]

 

Code indicating the NAK return as described below

 

 

 

 

 

 

 

 

Fixed to :N (‘3Ah’ ‘3Eh’ in the ASCII code. Not added to ACK.)

 

[End code]

 

Fixed to

 

.(‘0Dh’ in the ASCII code)

 

 

 

 

 

3. Control sequence

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Computer Projector

 

 

 

Sequence

 

 

Note

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

Send the command from the personal computer

 

 

 

 

 

1

 

 

 

to the projector.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The projector will send a return command after it

If the projector does not receive commands

 

 

 

 

 

 

receives an end code.

 

normally, that is, if the projector is not connected

 

2

 

 

 

 

 

 

 

 

 

physically or unable to receive commands, it

 

 

 

 

2

 

 

 

 

 

does not send out a return command.

 

 

 

 

 

 

 

 

 

 

The projector sends out a return command within

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

one second at the latest.

 

 

3

 

 

 

 

 

 

 

 

 

When the received command cannot be

 

 

 

 

 

 

 

 

 

 

executed, NAK is returned (as described below).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The personal computer checks the command

 

 

 

 

 

 

 

 

 

3

and confirms if the sent command has been

 

 

 

 

 

4

 

 

 

 

received or not.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Use the check command to see if the projector

This projector sends various codes other than

 

 

 

 

 

 

 

 

 

 

 

4

has executed the command.

 

the return code. When having a control

 

 

 

 

 

 

 

 

 

 

sequence by RS-232C, reject other codes from

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the personal computer.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

•NAK return

In the following cases, the projector returns the command with “:N” added.

(1)Though the command sent from the computer is received by the projector successfully, it cannot be executed because the projector is in the operation prohibition state.

(2)The data length of the sent command is incorrect or the command is invalid.

•When a command is sent out during the following operations, it may not be executed.

(1)During signal switching

(2)In the process of the auto position

(3)After the power is turned on.

The projector receives no commands for about 20 seconds (or for 2 minutes at the longest if the lamp does not light up promptly as the life is expiring). In this case, the projector returns the received command with NAK added.

•The return command is sent out within 1 second at the latest.

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

•The projector may not receive a command when the splash screen is being displayed immediately after turning on the power.

•While using the LAN terminals, the LAN functions take precedence.

2

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Mitsubishi Electronics EX321U-ST, EW331U-ST manual Control command configuration, Control sequence
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EW331U-ST, EX321U-ST specifications

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