Справочник Пользователя для Mitsubishi Electronics FD630U

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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]

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)

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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.

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

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

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The projector may not receive a command when the splash screen is being displayed immediately after turning on
the power. Use command “00r10” to cancel the splash screen.

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

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For the LAN terminals, the same commands as those for connecting with the TCP/IP (port number 63007) are avail-
able. Note, however, that the response becomes slightly slower than when using the RS-232C terminals.

Address code

Function code

Data code

ACK/NAK

End code

ASCII

‘30h’ ‘30h’

Function

Data

‘3Ah’ ‘4Eh’

‘0Dh’

Character

00

Function

Data

:N

Computer

Projector

Sequence

Note

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 projector does not receive commands 
normally, that is, if the projector is not connected 
physically or unable to receive commands, it 
does not send out a return command. 
The projector sends out a return command within 
one second at the latest. 
When the received command cannot be 
executed, NAK is returned (as described below).

3

The personal computer checks the command 
and confirms if the sent command has been 
received or not.

4

Use the check command to see if the projector 
has executed the command.

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.

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