Multiport Serial Adapters

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StarTech.com 16 Port PCI Express Serial Card - Low-Profile - High-Speed PCIe Serial Card with 16 DB9 RS232 Ports

PEX16S550LP
Add 16 RS232 serial ports (DB9) to your low or full-profile computer, through a PCI Express slot - 16-Port PCI Express Serial Card - Low-Profile - High-speed PCIe serial card with 16 DB9 RS232 Ports (up to 921.6 Kbps) - Multiport serial adapter card
$313.54

StarTech.com 4 Port PCI Express PCIe Serial Combo Card - 2 x RS232 2 x RS422 / RS485

PEX4S232485
Add two RS232 and two RS422/485 serial ports to your PC through a PCI-Express expansion slot - 4 Port PCI Express PCIe Serial Combo Card - 4 port (2 x RS232, 2 x RS422/485) serial combo card - PCI Express RS485 / PCIe RS485 / PCI Express RS422 / PCIe RS422 serial combo card - Dual Profile PCIe serial card adapter with breakout cable - RS232 data transfer rates up to 460 Kbps - PCIe serial combo card supports 2-Wire / 4-Wire RS485 modes - Compliant with PCI-Express Specification 1.0a
$140.56

StarTech.com 4 Port PCI Express Serial Card w/ Breakout Cable

PEX4S553B
PCI Express x1 - 4 x DB-9 Male RS-232 Serial Via Cable - Plug-in Card
$103.26

StarTech.com 4 Port RS232 Mini PCI Express Serial Card w/ 16650

MPEX4S552
Serial adapter - Mini PCI Express - RS-232 x 4
$99.91

StarTech.com 4 Port RS232 PCI Serial Card Adapter with Power Output

PCI4S954PW
PCI-X - 4 x DB-9 Male RS-232 Serial - Plug-in Card
$91.11

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

PEX4S953LP
4 port PCI Express RS232 serial controller card w/16950 UART/ASIX AX99100 - Bi-directional speeds 921.6Kbps/port | 256 byte FIFO | 9th data bit - Pin 9 pwr out 5v/12v/none w/up to 2A total - Std bracket (low profile incl); Breakout cable - Win/Linux
$102.77