To test your setup components try the following.
Serial usb cable driver.
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Usb 2 0 to serial cable 6 ft ftdi chipset user manuals windows drivers.
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It is easy to install.
Ugreen 2m usb to serial db9 9 pin rs232 converter cable.
Ugreen usb 2 0 to rs232 db9 serial cable male a converter with ftdi chipset for windows 10 windows 8 1 windows 8 windows 7 windows vista windows xp 2000 linux os and mac os x 10 6 and above.
User manuals windows drivers.
Use a different serial cable serial port and serial device in your setup to see if the problem persists.
Usb to rs485 mini.
Usb rs232 ftdi designs and supplies usb semiconductor devices with legacy support including royalty free drivers.
5 port usb 2 0 pci card.
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You can check the driver loaded using the procedure above.
Not 3 2 0 0 when this occurs you will need to either load driver 3 2 0 0 to the new usb slot or plug the cable back into its original usb slot.
Usb 2 0 to 2 5 ide aluminum hard drive enclosure.
Download software for the device.
Usb to serial rs485 and rs422.
Prolific does not sell cables with prolific brand and packaging.
Application areas include usb rs232 usb serial usb parallel usb docking stations and upgrades of legacy designs to usb.
Prolific recommends following vendor cable brands.
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If the cable is moved to a different usb slot windows will now load the newest driver to that port.
In case you suspect a counterfeit chip inside you may also contact prolific to provide the vendor information.