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Quatech USB to Serial Adapter, 4-port

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USB to Serial, 4-port (SW-4572) SW-4572
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Sewell Direct reviews:
They were the only business that had exactly what I wanted at a reasonable price. It shipped immediately and works well.
Sewell Part #:  SW-4572   Mfg Part #:  QSU-100
Discontinued What does Discontinued mean?
Quatech USB to Serial Adapter, 4-port
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$150.95
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Quatech
Add four reliable, hot-swappable serial ports using only one USB port. Quatech RS-232 serial adapters are among the most trusted in the industry, compatible with virtually all chip sets including Legacy.

Using serial devices via USB provides the advantage of being plug and play capable. The adapter enumerates itself as a COM port making the USB interface completely transparent to software. In addition, the adapter contains deep data FIFOs and use accelerated UART clock frequency to boost serial data transfer rates up to a velocious 460.8 Kbps. It's the fastest transfer speed available for USB serial adapters without making software changes.