Miscellaneous Electronics
2/4 Ports RS422/485 Serial PCIE2.0 Card High Performance Interface Industrial Machine Multiple PCIexPress
This card features multiple I/O PCIe controllers in the XR17V358 series. For industry standard 16C550 UART Whether you are setting a factory or a home workshop, this card supports asynchronous full duplex communication via twisted pair or shielded...
https://www.bizrate.co.uk/miscellaneouselectronics/2-4-ports-rs422-485-serial-pcie2-0-oid40350209350.html