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nullmodem

About this tag
The nullmodem tag covers discussions about using nullmodem cables for serial communication between older and modern Windows PCs. A recurring theme is troubleshooting asymmetric serial port problems after reinstalling Windows 7, where data flows in one direction but not the other. Users share experiences connecting legacy DOS-based scientific equipment to Windows 7 via nullmodem cables, often encountering issues after OS reinstallation. The tag focuses on practical solutions for maintaining serial connectivity with older hardware, including terminal emulator configuration and driver settings. Topics are specific to Windows 7 and earlier systems, with emphasis on preserving legacy hardware compatibility.
  1. brembs

    Windows 7 Asymmetric serial port problems after reinstall

    I use a nullmodem cable to transfer data from an old PC controlling a scientific experiment (custom software for DOS). I have been using this method for the last 15 years on probably 8+ different PCs (always connecting to the same old PC). I have been using this method since Windows 7 came out...
    • brembs
    • Thread
    • asymmetric bi-directional computer issues connectivity custom software data transfer experiment hardware issues nullmodem pci serial card reinstall serial port terminal emulator usb to serial windows 7 z-modem
    • Replies: 6
    • Forum: Windows Help and Support
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