StarTech.com 2 Port RS232/422/485 PCI Serial Adapter Card w/ESD - Serial Adapter - PCI - RS-232 x 2 - Yellow - PCI2S232485I

I purchased this card, after going through a huge amount of frustration with an external RS232/RS485 converter, for PTZ control of our security cameras. It shows up as a couple of COM ports under Windows server 2003, and works very well indeed.StarTech's definitely got a winner with this one. If you have need for RS485 ports, it won't get much better than this.

Ok

Driver set very weak. Doesn’t consistent work on Windows 10.