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SeaCOM
Software support package for Sealevel asynchronous serial product family.
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Software Release Note
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Version 3.9.1
Copyright (c) 2000-2026 Sealevel Systems, Inc.
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This document describes the Sealevel Systems SeaCOM for Windows software release.

This document is divided into the following sections:
- Description
- Requirements
- Changes
- Known Issues
- Technical Support


Description
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SeaCOM provides a powerful Win32 interface (CreateFile, ReadFile, WriteFile, etc) for Sealevel asynchronous serial products.


Requirements
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1. Sealevel Systems asynchronous serial hardware.
2. 32-bit or 64-bit Microsoft Windows 7, 10 or 11
    a. Windows 7 requires the following additional updates:
        - Service Pack 1 - https://support.microsoft.com/en-us/help/15090/windows-7-install-service-pack-1-sp1
        - KB4474419 - Microsoft Root Certificate Authority 2011, SHA-2 support
            - Download: https://www.catalog.update.microsoft.com/search.aspx?q=kb4474419
            - Prerequisite for .NET Framework 4.6.2
        - KB3033929 - SHA-2 Support
            - Download: https://www.catalog.update.microsoft.com/Search.aspx?q=kb3033929
            - Avoid repeated "Always trust" prompt while installing FTDI drivers
        - KB2676562 - Windows kernel-mode drivers security update
            - Download: https://www.catalog.update.microsoft.com/search.aspx?q=kb2676562
            - More info: https://support.microsoft.com/help/2676562
            - Avoid repeated "Always trust" prompt while installing FTDI drivers
3. Microsoft .NET Framework v4.6.2 or later (included in installer executable).
4. 80 MB free hard drive space.


Changes
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Version 3.9.1
    1. Drivers
        a. SeaCOM-Exar v5.5.1.5, 02/16/2026
            - Added support for R1 Edge
            - Added support for 7203ec
        b. SeaCOM-FTDI v2.12.36.4, 03/18/2025
            - Added support for Flexio Dual Port Software-Selectable Serial RS-232/422/485 (F1) (9540).
            - Removed FTDI coinstaller (SSIncftserco.dll) due to Microsoft attestation restrictions. SeaCOMOrder replaces this functionality.
    2. Installer
        a. Added .NET Framework 4.6.2 installer.
        b. Fixed bug where drivers were reinstalled during package uninstallation.
    3. Samples
        a. Retargeted all projects to Visual Studio 2019.
    4. SeaCOMOrder v1.0.0.11 (new)
        a. This background service rearranges the numbering of newly enumerated Sealevel USB and PCI(e) COM ports to match their physical order on the multi-port device.
    5. Utilities
        a. SeaCOM PortManager .NET v1.2.0.10
            - Added support for R1 Edge
            - Added support for 7203ec
            - Added support for Flexio Dual Port Software-Selectable Serial RS-232/422/485 (F1) (9540).
            - Fixed bug with FTDI devices where baud rate aliasing couldn't be read if advanced driver settings were changed.
        b. WinSSD v3.4.2.3
            - Fixed bug where saving configuration of SEAMAC device wrongly showed an error message when no error occurred and vice versa.
            - Converted help from legacy WinHlp format to compiled HTML help. Added Help button to WinSSD dialog.
            - Fixed garbled version numbers shown in the About WinSSD dialog box when the program file WinSSD.exe is renamed.


Known Issues
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1. The user must accept a trust prompt when installing the FTDI driver on Windows 7.
2. The SeaCOM-Exar driver on Windows 7 requires the user to accept a warning message because Microsoft no longer allows cross-certificate signing.
3. The SeaCOM-Exar driver will not install on Windows 8.1 due to the above issue.


Technical Support
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Sealevel Systems Inc. technical support is available Monday through Friday 8 A.M. to 5 P.M. Eastern Time at (864) 843-4343. Support is also available via email at support@sealevel.com. Please refer to our website at www.sealevel.com for additional product information, software updates, and current manuals for our products.