I'm a new IT support specialist at a college in Baltimore. The classrooms I am responsible for have AV control panels and switchers made by Extron. The control panel is the MLC 226 IP DV+ and there is one mounted on each teacher station at the front of the classroom. It manages a number of sources, including a doc cam, laptop, and PC AV inputs. The audio is routed to speakers in the ceiling and the video is routed to a projector. When PC is selected (as it is the default position since almost all profs want to teach from the computer at the podium) they don't get audio upon login. I find that I have to toggle to another input (like "laptop") and then back to the "PC" input to get audio to play. It happens every time. There doesn't seem to be any documentation that speaks to this, and I can't find a single setting in Windows 7 that will address the issue either. My guess is that as each person logs out, there is some sort of reset signal sent to the switcher. I'm not even sure if that makes sense.Please offer any insight that may suggest there is a solution to this problem. I searched for something like this and didn't see anything, so if this is misplaced I apologize. Thanks in advance!
While, theoretically, your IT department may have written custom code for the PC that sends an RS-232 signal to the controller upon log-off, it is highly unlikely. I'd look elsewhere. Have you actually tried this yourself and confirmed it to be an issue?I'd suspect that the 'Off' function of the controller mutes the audio, and the 'On' function does not un-mute it, leaving it in a muted state until a source is (re-)selected.
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