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  • 正式なコメント
    TESmart.01

    Hello, 

    Thanks for reaching out. Using DP to DVI-D adapters on the output side can indeed lead to compatibility issues, especially with certain monitors or resolutions. In general, our KVMs are not officially compatible with video signal conversion on the output ports, and we do not recommend using adapters in this part of the setup. 

    Since your ViewSonic VX2739WM monitors support HDMI input, we recommend switching to our HKS402-P23 model. It features HDMI output ports, allowing you to connect directly to the monitors via HDMI cables, avoiding the potential instability caused by adapters and ensuring reliable video performance. 

    If you wish to upgrade to a more compatible model, please feel free to contact our after-sales support team for assistance with product exchange options. We’ll be happy to help you with the process. 

    Let us know if you need further assistance. 

    Best regards,

  • Alexander Oberfeld

    Thanks for your response. Please note that both monitors are recognised by both PCs on DVI-D. HDMI is not an option because this feature was not implemenred with the Viewsonic VX2739 monitors. So, in essence, the only
    connection I have is the DVI-D on both units. I may need to purchase two Display Port (DP) monitors since both of my ViewSonic VX2739WM monitors ar @ 2010.

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  • Texas KVMer

    I think I am having the same issue with a Viewsonic VA2451. It has the DVI port, but no HDMI. Every adapter I try gives me the same results—monitor detected by computer OS, but a black display with the monitor saying “no signal”.

    @Alexander - is this what you were seeing?
    @Support - is this what you are describing to Alexander?


    Thank You!

    1
  • Alexander Oberfeld

    I ended up buying two new monitors…additional 1000.00 …

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  • Alexander Oberfeld
    編集済み

    Still problematic…one of the DELL computers does not remember the positioning of the windowed apps, when switched from and to. Sadly.

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  • TESmart.02

    Dear Alexander,

    Thank you for your message, and we’re sorry to hear about the inconvenience you’re experiencing.

    From your description, the issue occurs on one of your DELL computers where windowed applications do not retain their positions after switching away and back through the PKS0403A20. This behavior is caused by how Windows handles display reconnection when the video signal or EDID information changes.

    When the KVM switches to another source, Windows detects the displays on the inactive computer as “disconnected.” As a result, it rearranges or minimizes all open windows. When you switch back, the operating system redetects the monitors but does not automatically restore the original window layout.

    Here are a few steps we recommend to minimize or eliminate this behavior:

    1. Update the graphics drivers on your DELL computers to ensure stable EDID handling.

    2. Optionally, you may use tools such as DisplayFusion or Microsoft PowerToys (FancyZones) to automatically restore window positions when displays reconnect.

    If the issue persists after these steps, please let us know your laptop model and operating system, so our technical team can further investigate and, if needed, provide a firmware update or tailored solution.

    Best regards,

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  • TESmart.02

    Dear Texas KVMer,

    Thank you for reaching out and sharing the details. We’re sorry to hear about the issue you’re facing with your ViewSonic VA2451 monitor.

    The computer can detect the monitor, but the screen remains black and the display shows “No Signal.” This typically happens when using a DVI monitor through an HDMI or DisplayPort adapter. Although HDMI and DVI use similar digital signals (TMDS), there are a few key differences that can cause this issue:

    Signal compatibility – HDMI includes audio and HDCP encryption that DVI does not support. If the output source (such as your PC or KVM switch) sends HDCP-protected or audio-enabled HDMI signals, the DVI monitor may fail to display an image even though it is detected.

    Adapter type – Many HDMI↔DVI adapters are passive and only work in one direction (HDMI output → DVI input). If your signal path includes a DisplayPort or KVM, an active converter with a signal conversion chip is required.

    EDID/HDCP handling through the KVM – If the KVM switch is connected, it may be emulating an HDMI EDID with HDCP or audio capabilities that your DVI monitor does not support.

    Thank you for your understand.

    Best regards,
     

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  • Texas KVMer

    TESmart,

    Thank you for the support!!  It was perfect.

     

    For people looking for more detail…. I have a HDC402-P23 (2 laptops and 2 PCs with 2 monitors).  I have a Lenovo laptop on a dock and a 2018 Mac Mini--both plugging in as the 2 PCs.  My monitors WERE a Dell P2213 (HDMI)  and Viewsonic 2451 (DVI).  The Dell worked fine with both PCs, but I could not get the Viewsonic to work at all with the Mac (the Dell and Lenovo worked great).  I tried many cables and adapters with no luck.  Switched the Viewsonic with an inexpensive Asus VY249HGR (HDMI) AND got a USBc-to-DPort cable for the Mac-to-KVM connection.  That did it!!  So, if anyone is having similar problems, first try a new cable without adapters (because it is cheaper) then consider swapping out the monitor--especially if it is an older model.  As for the cable, I found a cheap one online that specifically said it would work with a Mac laptop and assumed it would then work with a Mac Mini.  It did.  All good here and I am very happy with the TESmart KVM!

     

    Good luck!

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  • TESmart.02

    Dear Texas KVMer,

    Thank you so much for your kind feedback and for taking the time to share your detailed setup experience with the HDC402-P23. We’re very glad to hear that everything is now working perfectly for you!

    Your troubleshooting notes are extremely helpful — especially the insight about older DVI monitors and the importance of using direct HDMI or DisplayPort connections without adapters. We truly appreciate you sharing this; it will certainly help other users who might run into similar compatibility issues.

    Just as a reminder, macOS currently doesn’t support MST (Multi-Stream Transport), so when using dual-monitor KVMs, each display needs to be connected to a separate video output port on your Mac or dock.

    We’re thrilled that you’re happy with your TESmart KVM, and we hope it continues to make your workspace more efficient and enjoyable. Should you have any other questions or suggestions in the future, please don’t hesitate to reach out — we’re always happy to help.

    Best regards,

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