780C Multi-Interface Interoperability Tester – User Guide Page 156September 29, 2014 Revision A111. Touch select Stop activation button (top left) to halt the collection of messages.12. Touch select Clear activation button (top center) to clear the collected of messages.8.2.4 Configurations for Monitoring DDC Transactions with ACA on HDMI Source DevicesThis subsection provides configuration diagrams that depict ACA monitoring of HDMI source devices, with orwithout a repeater, while the 780C is emulating an HDMI sink device.8.2.5 Configurations for Monitoring DDC Transactions with ACA on HDBaseT Source Devices