Best Startech Serial Port Cards in 2026

Add two RS232 serial ports with COM retention to your laptop or desktop computer through USB

2 Port USB to Serial RS232 FTDI Cable Adapter with COM Retention

USB to RS232 Adapter / USB to DB9 Adapter / USB to Serial Adapter / USB Serial Cable / USB to RS232 Serial

MULTI-USE FUNCTIONALITY: Use this versatile USB to serial RS232 adapter for everything from digital signage to connecting point of sale systems and barcode scanners.

CUSTOMIZABLE SOLUTION: This USB serial hub features an FTDI chipset, making it highly customizable and compatible, and the ideal solution for any setup.

COMPACT DESIGN: Designed with a small form factor, this serial RS232 converter is USB powered and requires no bulky power adapters or an outlet.

2 PORT SERIAL CARD: Serial controller card w/16550 UART based on ASIX MCS9922CV-AA, allows 2x DB9 ports w/bi-directional RS232 speeds up to 460.8Kbps per port, available 256 byte FIFO buffer | Upgraded version of our popular card PEX2S952

OPTIONAL CONFIGURABLE POWER: PCI Express RS232 Serial Adapter Card provides choice of 12v, 5v, or none through pin 9. Each of the 2 ports are individually configurable

STANDARD PROFILE & LOW PROFILE BRACKET: PCIe multiport serial card comes w/ a standard bracket pre-installed & 2x low profile brackets incl for versatile install; supports Windows & Linux

HIGH-PERFORMANCE: Add eight SATA III 6Gbps ports to your desktop computer or server using a PCIe x4 Gen 2 slot to connect SATA drives (HDD/SSD); 8-Port SATA PCIe Card features 2x Mini-SAS connections with Mini-SAS to 4x locking SATA adapter cables incl.

QUAD CONTROLLERS: This PCI Express SATA 6 card features a PCIe MUX and four 2-Port SATA host controllers; This architecture allows for eight total SATA (serial ATA) 6Gbps ports through a single x4 PCIe slot, enabling combined total throughput up to 20Gbps

COMPATIBILITY: Supports PCIe Gen 2 & SATA III Specs, and previous generations at lower performance (SATA I/II, PCIe Gen 1); Windows (XP+), macOS (10.6.8+), Linux (2.6.32+); Improved motherboard compatibility with no bifurcation required & no built-in RAID

FAST DATA TRANSFER: This PCI Express to firewire adapter reduces performance bottlenecks by offering support for data transfer rates up to 400Mbps to each port

VERSATILE USE: Each 2 port PCI express 1394a firewire card comes pre-configured for low-profile and includes two full-profile brackets for versatile use with low profile and standard computer cases

INCREASE CAPACITY: This PCIe serial port card allows you to add two FireWire 400 connections to your desktop computer using one PCIe expansion card slot

1 PORT SERIAL CARD: Serial controller card w/ 16550 UART based on ASIX MCS9922CV-AA, allows 1x DB9 port w/bi-directional RS232 speeds up to 460.8Kbps per port, available 256 byte FIFO buffer; Upgraded version of our popular card PEX1S552LP

OPTIONAL CONFIGURABLE POWER: PCI Express RS232 serial adapter card provides choice of 12v, 5v, or none through pin 9

STANDARD PROFILE & LOW PROFILE BRACKET: PCIe serial card comes w/ a low profile bracket pre-installed & 1x full profile bracket is incl for versatile install; Supports Windows & Linux

One high speed RS232 serial port with data transfer rate up to 460.8 Kbps

Ships with half-height/low profile mounting bracket, includes optional standard profile bracket

Single chip design optimizes speed and reliability

Add two RS-232 serial ports to your standard or small form-factor computer through a PCI Express expansion slot

2 Port Low Profile Native RS232 PCI Express Serial Card with 16950 UART

2 Port PCI Express Serial Card with 16950 UART

Add 2 RS-232 serial ports to your full height or low profile computer through a PCI Express slot

PCI Express Serial Card

PCI-e Serial Card

MEETS INDUSTRY STANDARDS: The 2-port PCI express serial card is compliant with PCI Express 1.0a specification, and it's compatible with 1x, 2x, 4x, 8x and 16x PCI Express slots.

MAXIMUM COMPATIBILITY: The dual port DB9 to PCIe adapter is ideal for system upgrades in a wide range of applications including manufacturing equipment, POS equipment, and security devices.

HIGH-PERFORMANCE COMMUNICATION: The low-profile serial card delivers high-performance serial communication, with support for data transfer rates of up to 460Kbps.

Add a parallel port and two RS-232 serial ports to your PC through a PCI expansion slot

2S1P PCI Serial Parallel Combo Card with 16550 UART

PCI RS232 Serial Card plus Parallel Port

Add a parallel port and two RS-232 serial ports to your PC through a PCI-Express expansion slot

PCI Express Serial Parallel Card

PCIe Serial Parallel Combo Card Adapter

Add 1 parallel port and 2 RS-232 serial ports to your standard or low-profile computer through a PCI Express expansion slot

PCi Express Serial Parallel Card

PCI Express Serial Card

Native single chip design

Includes a full profile and low profile/half-height bracket

On chip 256-byte depth FIFO in transmit/receive path of each port

Add 4 RS-232 serial ports to your standard or small form factor computer through a PCI Express Expansion Slot

4 Port PCIe Serial Card

4 Port RS232 Card

1 PORT SERIAL CARD: Serial controller card w/ 16950 UART based on ASIX AX99100, allows 1x DB9 port w/bi-directional RS232 speeds up to 921.6Kbps per port, available 256 byte FIFO buffer & 9th data bit; Upgraded version of our popular card PEX1S952LP

OPTIONAL CONFIGURABLE POWER: PCI Express RS232 serial adapter card provides choice of 12v, 5v, or none through pin 9 w/up to 2A total

STANDARD PROFILE & LOW PROFILE BRACKET: PCIe serial card comes w/ a low profile bracket pre-installed & 1x full profile bracket is incl for versatile install; Supports Windows & Linux

2 PORT PCI RS232 SERIAL ADAPTER CARD: Controller card w/ 16C550 UART based on ASIX MCS9865, 2x DB9 ports w/bi-directional RS232 speeds up to 115.2Kbps/port, 256 byte FIFO buffer & 9th data bit | Upgraded version of our popular cards PCI2S550_LP & PCI2S550

TECH SPECS: Speeds up to 115.2Kbps | 16C550 UART | 256 byte FIFO buffer | 5,6,7,8 and 9 bit character | Even, Odd, No, Space or Mark Parity | Auto IRQ & IO assignment | Supports IRQ Sharing | ASIX MCS9865 Chip

VERSATILE APPLICATIONS: Dual Serial Port PCI Card for PCI desktops/servers used in point of sale terminals, PLCs, CNC Machines, control/automation in factories, scientific sensors, medical equipment, scanners, oscilloscope

EXPANSION CHASSIS FOR PCIE CARDS: Increase the PCI-e slot count of a desktop computer or server; Add four external PCIe x1 slots; PCI Express 2.0 x2 proprietary USB-C Host Card with locking port; 5.9ft (1.8m) USB-C locking cable included

RUGGED CONSTRUCTION: PCI Express expansion box is built with SECC steel to withstand harsh conditions and up to 140°F (60°C); Vented chassis for cooling; Quiet operation; Power adapter (12V 3A) included, terminal block port (12-24 VDC) available

HASSLE FREE UPGRADES: Connect add-on cards (e.g., USB, Ethernet, SFP, Serial, and I/O Cards) to a host system with limited expansion slots; Implement fast deployments and reduce the cost and downtime required to configure an existing or new host system

8 PORT SERIAL CARD: Serial controller card w/ 16C1050 UART based on the Systembase SB16C1058PCI, w/15kV ESD, 8x DB9 ports, bi-directional RS232 speeds up to 921.6Kbps per port & 256 byte FIFO buffer; Upgraded version of our popular card PEX8S952

OPTIONAL CONFIGURABLE POWER: Multiport serial card provides 12v/5v, or none on pin 9 w/up to 3A total shared; 18"/48cm DB62 to 8x DB9 breakout cable incl; Hex nuts incl for opt screw/nut DB9 interface

COMPATABILITY: Full profile PCI-e 1x card and fully compliant w/ PCI Express Base Specifications, Revision 1.0a/1.1; Supports Windows (incl. XP and up) and Linux; For standard profile desktop/servers

Native single-chip, single lane PCI Express offers increased speed and reduced CPU load by up to 48%

Data transfer rates of up to 460 Kbps for peak serial device performance

Easy to install and use with full step-by-step instruction providing a hassle free serial solution

Add 16 RS232 serial ports (DB9) to your low or full-profile computer through a PCI Express slot

This 16-Port PCI Express Serial Card provides high-speed PCIe serial card with 16 DB9 RS232 ports from a single PCIe slot

Multiport serial adapter card enables high-speed serial communication with data transfer rate up to 921.6 Kbps

Add two RS422/485 serial ports through a standard or low profile PCI expansion slot

2 Port PCI RS422/485 Serial Adapter Card with 161050 UART

PCI serial card supports maximum data transmission rate of 128Kbps

Lower CPU load of native single-chip, single lane PCI Express design ensures optimal system performance (up to 48% less CPU load)

Included standard and low profile/half-height brackets makes this the perfect card for any application including small form factor embedded applications

Breakout cable design means that only one expansion slot is needed to add 2 serial ports to any system

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

PCIe CARD WITH SERIAL & PARALLEL PORT: Using a x1 PCIe 2.0 slot, add a DB25 parallel & a DB9 RS232 port to your computer; Card installs in full/standard profile PCIe slot; Latest version of our popular PEX1S1P952

TECH SPECS: Parallel Speeds up to 2.5Mbps | Supports SPP/Byte/ECP modes | Compatible with IEEE 1284 | Asix AX99100 chip | RS232 speeds up to 921.6Kbps | 16C950 UART | 256 byte FIFO buffer

VERSATILE APPLICATIONS: PCIe expansion combo card adds LPT Printer & COM serial ports working with printers, scanners, plotters, point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, oscilloscope

4 PORT SERIAL CARD: Serial controller card w/ 16950 UART based on ASIX AX99100, allows 4x DB9 ports w/bi-directional RS232 speeds up to 921.6Kbps per port, available 256 byte FIFO buffer; Upgraded version of our popular Serial card PEX4S952

OPTIONAL CONFIGURABLE POWER: PCIe multiport serial card provides 12v, 5v, or none through pin 9 w/up to 2A total; Each of the 4 ports are individually configurable; DB44 to 4x DB9 breakout cable incl

STANDARD PROFILE & LOW PROFILE BRACKET: PCI Express RS232 serial adapter card has standard bracket pre-installed & 1x low profile bracket incl for versatile install; Supports Windows XP and up & Linux

PCI CARD WITH SERIAL & PARALLEL PORTS: Using one PCI bus, add a DB25 parallel & two DB9 RS232 ports to your computer; Serial Parallel PCI Card installs in 2x full profile or 3x low profile expansion slots; Auto IRQ & IO assignment; Supports IRQ Sharing

TECH SPECS: Parallel Speeds up to 1.5Mbps | Supports SPP/Byte/ECP/EPP modes | Compatible with IEEE 1284 | Asix MCS9865 chip | RS-232 speeds up to 115.2 Kbps | 16C550 UART | 256 byte FIFO buffer | 5-9 bit character | Even, Odd, No, Space or Mark Parity

VERSATILE APPLICATIONS: PCI expansion combo card adds LPT Printer & two COM serial ports working with printers, scanners, plotters, point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, oscilloscope

4 PORT SERIAL CARD: Serial controller card w/16950 UART based on ASIX AX99100, allows 4x DB9 ports w/bi-directional RS232 speeds up to 921.6Kbps per port, available 256 byte FIFO buffer; Upgraded version of our popular card PEX4S952LP

OPTIONAL CONFIGURABLE POWER: PCIe multiport serial card provides 12v, 5v, or none through pin 9 w/up to 2A total; Each of the 4 ports are individually configurable; DB44 to 4x DB9 breakout cable incl

STANDARD PROFILE & LOW PROFILE BRACKET: PCI Express RS232 serial adapter card has low profile bracket pre-installed & 1x standard bracket incl for versatile install; Supports Windows XP and up & Linux

PCIE TO SERIAL: Connect serial RS232 (DB9) devices to a computer with this PC serial card. Features support for high performance 16C1050 UART on both DB9 male ports. Monitor activity with the built-in LED status lights on the PCI express DB9 card

DEVICE COMPATIBILITY: Use this serial interface card to connect barcode readers/scanners, receipt printers, scales, PLCs, medical devices, etc. The UART PCIe card supplies 5V or 12V power over pin 9. Low-profile brackets are included

APPLICATIONS: This card is ideal for IT applications such as server rooms, industrial control/automation, logistics, and laboratories. Continue using legacy hardware with this RS232 PCIe card. DB9 ports accept screw locking serial cables