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Control Command Configuration; Control Sequence - Mitsubishi Electric UD8400U Manual

Controlling the projector using a personal computer.
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2. Control command configuration

The command consists of the address code, ID code, function code, data code, ACK/NAK, and end code. The length
of the command varies among the functions.
Address code
ASCII code
'30h' '30h'
Character
[Address code]
[ID code]
[Function code]
[Data code]
[ACK/NAK]
[End code]

3. Control sequence

[Example]
When the personal computer and two projectors are daisy-chained:
Computer
Projector 2
Projector 1
1
2
3
3
4
5
5
6
6
6
• 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.
(3) The ID assigned to the command is out of the valid range (other than 00 to 63 or 0A to 0Z).
(4) The signal length of the command is 48 bytes or longer.
• 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.
After the power is turned on, no command is received until the image is displayed. (Usually, it takes about
20 seconds. However, when the lamp illumination takes time, more time will be required accordingly.) 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.
ID code
'30Bh' ID '30Bh'
00
;ID;
Fixed to 00. ('30h' '30h' in the ASCII code)
Code specifying the projector to be controlled (For ID, specify either the PROJETOR ID (00 to
63) or GROUP ID (0A to 0Z). When the code is not specified, all the connected projectors are
controlled.)
Code unique to each control operation.
Data (value) unique to each control operation (Not always indicated.)
Code indicating the NAK return as described below
Fixed to :N ('3Ah' '3Eh' in the ASCII code. Not added to ACK.)
Fixed to
. ('0Dh' in the ASCII cade)
Sequence
Send the command from the
1
personal computer to the projector.
The command input from the
SERIAL IN terminal is sent to the
2
projector connected to the SERIAL
OUT terminal.
After receiving the end code, the
projector sends the return command
to the device connected to the
SERIAL IN terminal.
3
The return command input from the
SERIAL OUT terminal is sent to the
4
device connected to the SERIAL IN
terminal.
The personal computer checks the
5
command and confirms if the sent
command has been received or not.
Use the check command to see
if the projector has executed the
6
command.
Function code
Data code
Function
Data
Function
Data
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.
In addition, when the ID code of the command is not
corresponded to that of the projector, the projector
doesn't send 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).
The personal computer receives the commands as
many as the number of the projectors that send the
returned commands. However, the receiving order
of the returned commands may vary depending
on the projector status.
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.
3
ACK/NAK
End code
'3Ah' '4Eh'
'0Dh'
:N
Note

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