StarTech.com 6ft (1.8m) 1-Port Professional RS422/485 USB Serial Cable Adapter with COM Retention, USB to RS422 Adapter - TAA

We use hundreds of these in our products. Best we have found.

Received 2 1US & 1 CA 1 sets on shelf as backup.

Using it for 422, no problems, only gave it 4 stars since the driver install did not go perfectly the first time. It seems to be a bit over priced for a USB serial converter.Bought another one after 5 years, someone has walked off with the one I had originally.When other RS422 adapters fail to work, this one works. No driver needed on Windows 7.

I will keep this for the next time I may need RS422. But it seems all FTDI FT232RL Chipset converters have missed the boat on RS485 2 wire communication. RS485 can be 2 wire or 4 wire (RS422). The ground is optional in both cases. There is no voltage or signal between D- and D+. There is a voltage difference to ground, but that is completely useless with 2 wires.

This unit was a bit more than some others but it came recommended and it works fine. The current (as of this writing) description says RS-422. Don't buy this if you need RS-485 and if you do don't leave a bad review because you purchased the wrong product.

It's entirely possible that I'm doing something wrong, but I never did get this working properly with the hardware I was trying to connect it to.

Didn't work. Returned for refund: have never received refund! This is the VERY LAST thing I ever buy from StarTech!

the item was great and it met all my specs