Cec Bus Monitor; Activating The Cec Bus Monitor; Querying The Cec Bus Monitor - Quantum Data 881 User Manual

CEC Bus Monitor

Activating the CEC bus monitor

Querying the CEC bus monitor

100 Chapter 12 CEC Interactive Troubleshooting Environment (ITE)
The 880 series CEC bus monitor is a powerful feature of the CEC ITE that enables you to
identify timing defects on the CEC line that would normally required an oscilloscope and
breakout box to identify using manual techniques. You can use the CEC bus monitor when
you are emulating either an HDMI CEC source or sink.
Use the procedures below to activate the bus monitor once you have configured the
generator and/or analyzer to emulate a CEC device.
To activate the CEC bus monitor:
1. Enable the CEC bus monitor by entering the following command:
CEC1:BUSM:ON
2. Clear the bus monitor bit buffer by entering the following command:
CEC1:BUSM:BITC
Note: It is important to clear the buffer regularly to ensure that you do not lose data.
To deactivate the CEC bus monitor:
1. Disable the CEC bus monitor by entering the following command:
CEC1:BUSM:OFF
You can query the CEC bus monitor messages and bits. You can check for bit timing
errors, query the timing parameters of each bit throughout a range of bits in the buffer or
throughout the entire buffer. You can also query for the correctness of the acknowledge
and end of message bits.
Query the bus monitor messages
You can query the bus monitor for all messages or specific messages based on an index
that you include on the command line.
To query the bus monitor for all messages:
1. Query the bus monitor for all messages by entering the following command:
CEC1:BUSM:MSGX?
The response will be:
// Turns the bus monitor on for CEC1
// Clears the bus monitor buffer for CEC1
// Turns the bus monitor off for CEC1
// Queries for all messages in the buffer for CEC1