JVC
Acknowledgement Response Return Codes - Basic
In most installations, it will normally be sufficient just to send a command to the projector and assume that the projector will carry it out requested. In some installations, there may be a requirement to confirm that the projector has carried out the command before continuing. This is particularly important when sending multiple commands. It is possible to check if the projector has carried out a command by monitoring the Acknowledgement Response Return Code returned by the projector. The projector will return an Acknowledgement Response Return Code for any valid command that it receives.
The general format of the Acknowledgement Response returned from the projector is:
06 89 01 CC CC 0A - Where CC CC is the first 2 bytes of the command that was originally sent to the projector (not including the 21 89 01).
Taking the Power On command from page 3 as an example, to switch the projector power on, send to the projector:
21 89 01 50 57 31 0A
If the Power On Command completes successfully, the projector will return:
06 89 01 50 57 0A
This Acknowledgement Response format is the same for all of the commands listed above.
The Acknowledgement Response Return Codes for all of the commands listed on pages
Function | Acknowledgement Response |
Power On/Off | 06 89 01 50 57 0A |
Input Changed | 06 89 01 49 50 0A |
Test Pattern On/Off | 06 89 01 54 53 0A |
Gamma Table Changed | 06 89 01 47 54 0A |
Gamma Value Changed | 06 89 01 47 50 0A |
Remote Control Emulation Command (all commands) | 06 89 01 52 43 0A |
Test (Null Command – to check communication) | 06 89 01 00 00 0A |
The list above includes a Test (null) response. This doesn’t actually do anything, but it is useful to check that the controller is communicating with the projector before sending any real commands. This should be used with the Test Command shown on page 3.
To use the test command, send to the projector:
21 89 01 00 00 0A
Assuming the projector is connected to the PC or controller correctly, it will respond with:
06 89 01 00 00 0A
It will respond whether it is in Standby or Powered On.
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