90 Chapter 12 CEC Interactive Troubleshooting Environment (ITE)
Message acknowledgement tests
You can simulate a condition where a message is improperly acknowledged. You can set
which conditions the 882 will not acknowledge a message. There are four places where
the message can be not acknowledged:
• Header of a directed message
• Data block of a directed message
• Header of a broadcast message
• Data block of a broadcast message
When a directed message is normally acknowledged the acknowledging device pulls the
CEC bus low. In order to not acknowledge a message the target device will not pull the
CEC bus low. When a broadcast message is normally acknowledged the acknowledging
device(s) leave the CEC bus high. In order to not acknowledge a broadcast message the
listening device will pull the CEC bus low.
The condition of incorrect acknowledgement will remain in place until you reset it.
Therefore once activated the improper acknowledgement remains for all messages
received by the 882.
To test message acknowledgement:
1. Enter the following command to simulate a message acknowledgement error.
CEC1:CECT:NACK 1 0 0 0 //indicates a directed header block will not
be acknowledged
CEC1:CECT:NACK 0 0 0 1 //indicates a broadcast data block will not be
acknowledged
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