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  1. Professional Quad Port USB to Serial DB-9 RS-232 Adapter
    $98.95

    USB 2.0 quad port serial DB-9 RS-232 adapter box is designed to make serial port expansion quick and simple. It instantly adds four RS-232 serial communication ports to your system with no conflicts with FTDI Chipset Learn More
  2. 4-Port USB DB-9 Serial Adapter Solution for Windows Operating Systems

    provides instant connectivity with modems, ISDN TAs, PDS, handheld & pocket PCs, digital cameras, POS, serial printers, etc. It is suitable for remote access, retail and industrial applications, data collection and other applications requiring a high speed serial communications port. Learn More
  3. 4-Port DB-9 RS232 to USB Adapter with Isolation and Surge Protection
    $249.99

    4-x port RS232 to USB adapter with isolation and surge protection each serial ports offer data transfer rate up to 920 Kbps for high system performance. Users are able to connect multiple serial devices through one USB port on their system. Learn More

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