The more unknown brands may not. And Windows 8, 8. These models that are sold by many sellers on Ebay. What worsens this issue is that there are many “Prolific Driver Removal Tools” that do not work properly. Use Google Search box in upper right side of this page. Does it show up in the Windows Device Manager as a valid com:

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While installing the driver it warned that older serial numbers wouldn’t work.

Many brands use FTDI chips. If your adapter was working prior to going to Windows Update, you can “roll back” to the previous installed driver and all will be well once again.

Or you may get no error at all, but your device will still not work. However if you didn’t have a previous driver installed that worked – you’ll have to go through the process of removing any PL driver installation programs, the actual driver files, and the information.

You must follow ever step in the process in exact order.


Will order from Parallax today. Mine looks like this one. I’ve heard this I can’t remember pll many times, so I will just repeat it.

Prolific recommends to purchase from following Cable Makers: Sign In or Register to comment. I might have to try one. I’m not sure, but Parallax tech support should be open in a few minutes.

And they can make it pretty, and so everybody can like it when others make it after you. Main cause of this issue is because the device you own contains a counterfeit “Prolific” chip China clone. Article credit goes to: I only have 2 ports and both are USB3.

It comes apart so you can use just 5v and r2s32. Are available from many places on Ebay: Sorry if you already said.

The trouble might be inverted signals. Use Google Search box in upper right side of this page.

Worth the cost, and you can take your laptop in to check if it loads. BTW, this particular blue cable installs as a Prolific chipset, but it looks like the “fake” version epoxy blob instead of IC visible detailed in the post For what its worth Reg, shish If satisfied with reply, Qten it!


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I am sure this is not a big problem. More info on the blue serial adapters from “another” forum: I just got an STK development kit that I’m trying to understand how to use. Information about drivers for Prolific chip: Comes in 4,8,16 ports. Find the website of your manufacturer and search for bit drivers.

ATEN USB Drivers

The “Driver Version” must say “3. There is no voltage level converter built into this adapter. I tried at least two of those blue ones you mentioned but no joy there. I have an inexpensive Windows7 Netbook and I run dropbox between it and my main computer. I’m afraid you are in a Windows 8 quagmire.

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