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asymmetric

About this tag
The tag asymmetric on WindowsForum.com covers issues where serial port communication becomes one-directional after a Windows reinstall. In one case, a user with a nullmodem cable connecting an old DOS-based scientific PC to a Windows 7 machine found that after reinstalling Windows 7, data from the old PC appeared on the Windows terminal, but keystrokes from Windows did not reach the old PC. The hardware was unchanged, pointing to a software or driver configuration problem. This tag is relevant for troubleshooting asymmetric serial port behavior, particularly after Windows reinstallation or driver changes.
  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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