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(More customer reviews)I do embedded hardware development, and frequently need RS232 for communication or debug with embedded devices. As PCs typically no longer include serial ports have become vital.
The nature of my work also means the devices I'm communicating with use a variety of baud rates, and are frequently powered up and down, causing spurious receive bits or handshake changes. Older Prolific USB-serial chipsets and especially FTDI chipsets handle such situations incredibly badly, and can easily get in a state where they do not send or receive any more serial traffic until the USB-serial adapter is unplugged and replugged - frustrating and time-consuming. The newer Prolific chipset on this device appears solid, and I've not yet lost serial traffic due to baud changes or power cycles of serial devices.
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