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[RS-232C control flowchart]
Sending out command
OK
NG
END
NAK returned
Command sending fails.
No NAK returned
START
Command is sent successfully.
Command is executed successfully.
Awaiting response
from projector
Command is sent successfully.
Command execution fails.
No response for
1 second or longer
Checking execution of
command (sending out
check command)
Check the following.
•
Check that the function code is correct.
•
Check that the data code is correct.
•
Check that the projector is able to issue
the return command.
Note: In the following cases, NAK is
returned even when the projector is
in normal condition.
•
Immediately after the power is
turned on (about 20 seconds to 2
minutes)
•
During input switching
•
During auto positioning
•
During password lock
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.