Mitsubishi Electric UL7400U Manual page 4

• 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 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. In some cases, the response time takes longer (about 3
seconds).
• 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. Use command "00r10" to cancel the splash screen.
• While using the LAN terminals, the LAN functions take precedence.
• For the LAN terminals, the same commands as those for connecting with the TCP/IP (port number 63007) are
available. Note, however, that the response becomes slightly slower than when using the RS-232C terminals.
For the use of LAN terminals, refer to "4. Execution procedure of RS-232C commands via LAN".
• When the NAK isn't returned, check the RS-232C command system (00COMMAND).
[Example 1] Turning ON the power. (Values enclosed in quotation marks are ASCII codes.):
Command sent from the PC
'30' '30' '21' '0D'
00!
[Example 2] Selecting VIDEO as the input signal during auto positioning (Values enclosed in quotation marks are
ASCII codes.):
Command sent from the PC
30' '30' '5F' '76' '31' '0D'
00_v1
• The flowchart on the next page shows the recommended operating sequence for your reference to create a
program.
Status code returned
from the projector
'30' '30' '21' '0D'
00!
Status code returned
from the projector
'30' '30' '5F' '76' '31' '3A' '4E' '0D'
00_v1:N
4
Description
Command for POWER ON
Command receipt confirmation
(Command echo back)
Description
(During auto positioning)
Command for selecting VIDEO as the
input signal is sent out.
The command is received by the
projector but cannot be executed.
(NAK return)