RS-232 Communications Adapters
Written by Michael Cone
Updated at February 3rd, 2026
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Many USB to serial adapters have incomplete or incorrect RS-232 implementations. There are many that we have tested and have found to be defective.
The Keyspan (below) is the only USB to RS-232 device we recommend for adding single serial ports to your computer.
MOXA makes devices that are usually very good. The multi-port unit is shown below.
Tripp-Lite Keyspan - USB to Serial Port Adapter
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The brand that we know works well is the Tripp-Lite Keyspan. |
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MOXA UPORT - USB to Multiple Serial Ports Adapter
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In the MOXA Uport line, you can purchase units that go up to 16 ports through a single USB port.
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