Control Command Configuration; Control Sequence - Mitsubishi Electric UL7400U Manual

2. Control command configuration

The command consists of the address 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]
[Function code]
[Data code]
[ACK/NAK]
[End code]

3. Control sequence

Computer
Projector
1
2
3
4
Function code
Function
00 Function
Fixed to 00. ('30h' '30h' in the ASCII code)
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' '4Eh' in the ASCII code. Not added to ACK.)
Fixed to . ('0Dh' in the ASCII code)
Sequence
Send the command from the
1
personal computer to the projector.
After receiving the end code,
the projector sends the return
command.
2
The personal computer checks the
return command and confirms if the
3
sent command has been received or
not.
Use the check command to see
if the projector has executed the
4
command.
Data code ACK/NAK
Data '3Ah' '4Eh'
Data :N
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.
When the received command cannot be executed,
NAK is returned (as described below).
This projector sends various codes including
the return code. During the control sequence
by RS-232C, reject other codes on the personal
computer.
3
End code
'0Dh'
Note