Alogic USB-C Fusion SWIFT 4-in-1 Hub - Space Grey

USB Type C - Portable - 4 USB Port(s) - 4 USB 3.0 Port(s) - Chrome OS, PC, Mac

StarTech.com 4-port PCI Express RS232 Serial Adapter Card - PCIe Serial DB9 Controller Card 16950 UART - Low Profile - Windows/Linux

4 port PCI Express RS232 serial controller card w/16950 UART/ASIX AX99100 - Bi-directional speeds ...

Comtrol RocketPort INFINITY Quadcable DB9 Multiport Serial Adapter

Universal PCI - 4 x DB-9 Male RS-232/422/485 Serial - Plug-in Card

Black Box Async PCI Express Card, Serial 16-Port, RS-232

PCI Express x16 - 16 x DB-25 RS-232 - Serial, Via Cable - Plug-in Card - TAA Compliant

Comtrol RocketPort INFINITY 4 or 8 Port Multiport Serial Adapter

Universal PCI - 8 x DB-9 Male RS-232/422/485 Serial - Plug-in Card

Brainboxes 8 Port RS232 Ethernet to Serial Adapter

DIN Rail Mountable, Wall-mountable - TAA Compliant

SIIG DP CyberSerial 2S PCI

Universal PCI - 2 x DB-9 RS-232 - Serial - Plug-in Card

Brainboxes VX-012 2-port Multiport Serial Adapter

ExpressCard - 2 x DB-9 RS-232 - Serial, Via Fan-out Cable - Plug-in Module - DB-9 Male Fan-out Cable

Brainboxes 4 Port RS422/485 PCI Express Serial Card

PCI Express x1 - 4 x DB-9 RS-422/485 - Serial - Plug-in Card - TAA Compliant

Digi Neo 8 Port Multiport Serial Adapter

PCI Express - 8 x RS-232 Serial Via Cable - Plug-in Card