3 Protocol
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PJ04030102B
3.9
Communication sequence
[ACK/NACK concept]
When the projector receives a command, it returns ACK immediately
if the command is prescribed. If not, the projector returns nothing.
[Operation sequence]
When projector receives an operation command, it returns ACK
immediately and performs the command operation. However, if the
projector receives the command while user operation is going on, it
only returns ACK for the command but operation is cancelled.
[Reference sequence]
When projector receives a reference command, it returns ACK
immediately, and then transmits related information for command as
response to external controller.
If the projector receives a reference command while in user
operation, it transmits ACK immediately, and then it transmits
response command after the completion of user operation.
This is because of conflict between projector information and the
information passed to external controller via response command
based on timing, if the reference command is approved while in user
operation.
Switching to
Comp.
Operation
command is
canceled.
External
Controller
PJ
Input [Operation] Comp.
ACK
Input Command
[Operation]
Input [Operation] HDMI-1
ACK
Nothing to do.
Command that does
not exist
Switching to
HDMI-1
Operation
command is
canceled.
External
Controller
PJ
Input [Reference]
ACK
Input Command
[Reference]
Input [Operation] HDMI-1
ACK
Input [Response]
Input [Response]
ACK
Input [Response]
