780C Multi-Interface Interoperability Tester – User Guide Page 150September 29, 2014 Revision A18 Using the 780C to Monitor the HDMI/HDBaseT CEC and DDCchannelThis section provides procedures for using the optional Auxiliary Channel Analyzer (ACA) feature. This optionenables you to monitor the following: HDMI/HDBaseT DDC and CEC emulation monitoring with Auxiliary Channel Analyzer (ACA) – The 780CACA enables you to monitor DDC transactions such as HDCP and EDID as well as hot plug related eventswhile emulating an HDMI/HDBaseT source and/or sink device(s) in an HDMI/HDBaseT system. DDC and CEC passive monitoring with Auxiliary Channel Analyzer (ACA) – The 780C ACA enables you topassively monitor HDMI CEC and DDC transactions between an HDMI source and sink. You can monitor+5V, hot plug events as well as the HDCP and EDID transactions and CEC messages.These ACA features require a license key and can be enabled remotely. The features and functionsdescribed in this section are included only if you have purchased the Auxiliary Channel Analyzeroption.8.1 Auxiliary Channel Analyzer (ACA) TransactionsThis subsection describes the ACA transaction screens. The screen shot and tables below describes theAuxiliary Channel Analyzer control buttons and on-screen transactions.Note: You can scroll through the transactions up or down (older to more recent) by sliding your finger or stylusup or down on the touch screen.The following table describes the control buttons on the top of the ACA screen.Table 8-2: Auxiliary Channel Analyzer activation button descriptionButton DescriptionStart/Stop A toggle button to initiate and then halt the collection of ACA transactions. You must stop thecollection if you want to save the transactions or view the details. Once stopped you can scrollthrough the transactions by moving your finger or stylus up or down.
