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Thread: MTSVO-SC: How to get screen to auto-open / auto-close on ignition state?

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    Constant Bitrate 01black_ac's Avatar
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    MTSVO-SC: How to get screen to auto-open / auto-close on ignition state?

    I've got my whole system test-wired at this point, using a spare battery, and simulating the ignition-ON state by connecting the Opus 120's red ACC wire to the battery + pole. The system POSTs properly, but I have some technical issues with Windows and will need to reinstall the OS. So, basically, the system does POST, but does not boot into Windows yet.

    When removing the red ACC wire from the battery + pole, the system shuts off, but the screen remains open. Is there a way to get the MTSVO-SC to auto-open and auto-close on startup and shutdown, or can it only be done manually by hitting the open/close button? Is this a software/driver thing with the screen itself, and will probably auto-open auto/close once I have the OS running properly, or is there something else to it?

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    Constant Bitrate 01black_ac's Avatar
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    Okay, I have the system completely reinstalled now, and it POSTs and boots into windows with no problem. I've set it up using the latest drivers from viaarena.com, which seem to be a lot newer than the ones on the via site.

    Anyway, I still have a problem with getting the MTSVO-SC to automatically open when the system boots up, and it doesn't auto-close when the system shuts down.

    Basically, when I remove the OPUS red ACC wire from the battery + terminal, the system shuts down properly, but the screen doesn't close. Then when I restart the system by connecting the red ACC wire of the OPUS to battery +, the screen closes while the system is booting. ?!? It seems like it's working sort of backwards... closes when the system starts up and stays open when the system shuts down...

    I have both the red ACCON and the yellow 12V for the MTSVO-SC connected to a cut molex connector 12V coming from my OPUS. I have NOT connected the green PARK wire on the MTSVO to anything.

    Any ideas why the screen doesn't auto-open / auto-close properly?

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    The way it's SUPPOSED to work is that the MTSVO-SC detects the ACC power being cut and it'll start closing.

    So, it sounds to me like the MTSVO-SC doesn't know the ACC is being cut. Obviously, your mobo sees it, since it starts powering off.

    Instead of powering the PC off by removing the OPUS red ACC wire from the battery, try just removing the screen's ACC wire from the molex connector. In theory, as soon as it's disconnected, your screen should close.

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    Quote Originally Posted by bash1979
    The way it's SUPPOSED to work is that the MTSVO-SC detects the ACC power being cut and it'll start closing.

    So, it sounds to me like the MTSVO-SC doesn't know the ACC is being cut. Obviously, your mobo sees it, since it starts powering off.

    Instead of powering the PC off by removing the OPUS red ACC wire from the battery, try just removing the screen's ACC wire from the molex connector. In theory, as soon as it's disconnected, your screen should close.
    It sounds like it isloosing MAIN power, and not accessory, or both Main and Acc power. Check your wiring, and also, make sure that only the accessory wire is going low when you are shutting the computer down, and not the main power as well.

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    Constant Bitrate 01black_ac's Avatar
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    Okay, I undid the splice that I had created where I connected the MTSVO red wire to the same 12V line that was supplying the MTSVO with power, but I left the red wire laying across the 12V wire. I then booted the system by connecting the OPUS red wire to the battery +. Once booted up, I disconnected the MTSVO red wire from the 12V line. The screen closed. When I reconnected the MTSVO red wire, the screen opened and returned to the custom tilt angle I had set.

    So, this seems like it's working properly, right? It seems what I was missing before was that I was only simulating the ignition off state to the Opus and not to the MTSVO.

    However, this leads me to another question... If I have my Opus set up to shut down after 10 seconds, and both the OPUS and MTSVO red ACC wires are connected to the same 12V ACC ON terminal under my dashboard, then both the Opus and the MTSVO will get the shutdown/close signal at the same time when the car is turned off by ignition key.

    The MTSVO takes approx 12-14 seconds to close. However, my system, running win2k, shuts down in approx 4 seconds. So, here's what I have happening... When I simultaneously disconnect the Opus red and MTSVO red, the system begins shutting down, and the MTSVO immediately begins to close. Windows shuts down properly, and then the OPUS shuts down with the MTSVO still approx 1.5" from being fully closed, at which point it just stops because the Opus has now completed its 10 second delay, cutting power to the MTSVO...

    Is this a wiring issue, or is this to be expected due to the shortness of the 10 second delay? I plan to run a 10min delay in my actual car installation, but I want to be sure that I haven't done something wrong with the wiring.

    Basically, the image below shows the current state of the wiring relevant to this question. The red stars show the points at which I'm disconnecting the red wires to simulate ignition OFF.




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    Constant Bitrate 01black_ac's Avatar
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    On doing some further testing, I reconnected the MTSVO red wire to the right-side position as in the image above, and then reconnected the OPUS red wire to the battery. The system booted, but the screen did not auto-open. I had to manually open it.

    I suspect it's because I'm tapping the MTSVO red wire to 12v behind the OPUS, instead of directly off the battery which would better simulate a car situation, right? I'm going to try splicing a length of wire onto the MTSVO red wire so I can reach the battery and then test by connecting/disconnecting both reds directly from the battery + terminal. Won't have time to do that until later this evening though.

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    Constant Bitrate 01black_ac's Avatar
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    I have both red wires connected to the battery + terminal for testing now. When I simulate the ignition being turned off, by removing both red wires from battery + the screen auto-closes, and if I reconnect both red wires within the 10 minute shutdown delay, the screen re-opens.

    However, if I remove both red wires and allow the machine to auto-shutdown after 10 minutes, and then reconnect the red wires to simulate the car being turned on, the computer boots but the screen does not auto-open...

    My wiring is the same as in the image I posted above, except that both red wires are now connected to battery +

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    Constant Bitrate 01black_ac's Avatar
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    Anyone know why my screen wouldn't be auto-opening with the setup as shown/described above? Could it have something to do with the green PARK wire?

    I've got the screen powered from a Molex behind the OPUS, and it does auto-close properly now. On startup (when I connect both red wires to battery +), there are a few seconds of delay before the system starts booting, so could it be that delay that is causing the problem? The red ACC wire gets a signal from battery +, but then the OPUS doesn't pass on 12V to the MTSVO for a few seconds... how brief is the ACC signal to the MTSVO? Could it be that the MTSVO has stopped receiving the ACC signal by the time it is getting 12V via the Opus?

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    Constant Bitrate faichiu's Avatar
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    you should connect the yellow wire directly to the battery and the red (ACC) to the ignition.
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  10. #10
    Constant Bitrate 01black_ac's Avatar
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    Connecting the MTSVO yellow wire directly to the battery + will shorten the life of the screen. It's an unregulated power source and subject to spikes. Plus, it will also cause the screen brightening and darkening that people on the forums have complained about.

    I know there's people out there using the MTSVO and the OPUS and who have their screens open on ignition. How do all of you have them wired up?

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