Mitsubishi Electronics UD8850U RS-232C control flowchart, Method of checking state of projector

[RS-232C control flowchart]

	START
	Sending out command
No NAK returned		No response for
	Awaiting response	1 second or longer
	from projector
	NAK returned

Command is sent successfully.

Command is executed successfully.

Checking execution of command (sending out check command)

OK

END

			Command is sent successfully.
			Command execution fails.
	Check the following.
	•	The ID code is out of the valid range.
	•	Check that the function code is
	•	correct.
		Check that the data code is correct.
NG	•	Check that the projector is able to
		issue the return command.

→Check the projector’s operation using the 00vST command.

Note: In the following cases, NAK is

returned even when the projector is in normal condition.

•Immediately after the power is turned on

(For status read commands) approximately for 10 seconds (For other commands) approxi- mately for 1 minute

•During input switching

•During auto positioning

•During password lock

Command sending fails.

Check the following.

•Check that the command begins with “00”.

•The projector is not supplied with AC power.

→Check that AC power cord is connected.

→Turn on the power. (Turn on the circuit breaker or main switch.)

•Not connected with the projector.

→Check that the RS-232C cable is connected.

→Check the RS-232C cable for electrical discontinuity.

•There is no projector with the specified ID in the daisy chain configuration.

→Check that the ID is correct.

→Check whether that there is a projector of which power (AC) is turned off in the daisy chain configuration.

[Method of checking state of projector]

Sending “00vST”

To normal operation	0–3	Checking response to “00vST”		4
		6	5

Projector error

Send out “00vER” to check error details.

Recover from error state.

Enter password.	Projector is functioning.
Send out “00PASS****.”	Use “00FNCOFF” to cancel the current function.

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