Best Parallel 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

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

✅ Quickly adds two serial ports and one parallel port through an available PCI Express slot

✅ Supports serial port data transfer rates up to 115.2 Kbps, compatible with 16C550 UART

✅ 256-byte depth FIFO buffer supports fast data transfer especially in a multitasking environment

This card capability allow for upgrade with additional serial or parallel cards to your computer easily. Note: Open the "CH38XDRV"file in the CD to install.

Multi-mode IEEE 1284 compliant controller (SPP, PS2, EPP, ECP), Faster data rates up to 1.5Mbps for parallel port.

Plug and Play, Automatically selects IRQ & IO address, Supports IRQ sharing.

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

This card capability allow for upgrade with additional serial cards to your computer easily. Note: Open the "CH38XDRV"file in the CD to install.

2 x 16C550 Fast Uart serial ports, supporting data transfer rates up to 230400Bps.

Plug and Play, Automatically selects IRQ & IO address, Supports IRQ sharing.

Interface type: PCI to 25 port parallel port, PCI to DB25.

Chip: WCH CH351Q chip.

If you connect to the printer and install the drive, you need to set the printer's port and the card to be consistent. The port of the card can be seen in device manager.

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

PCIe parallel port card, Compliant IEEE 1284 parallel port interface.

Based on WCH382l chipset, Connects more parallel device to your computer easily.

Faster data rates up to 1.5Mbps for parallel port.

Compliant with PCI Express Specification Rev 1.1; Compliant with IEEE 1284 standard

Supports ECP/EPP/SPP

Supports Bi-Directional data transmission of speed up to 2MByte/s

✅ Easily adds one serial port and one parallel port through an available PCI Express slot. 16C650 UART serial port with data transfer rate up to 250Kbps. Compliant with PCI Express 2.0 Gen 1. Compatible with IEEE 1284 -1994 parallel port standard for SPP/Byte/ECP Mode

✅ Single-lane (X1) PCI Express end-point controller with PHY integrated. Full serial modem control. Hardware and software flow control

✅ 5, 6, 7, 8 and 9-bit serial format. Even, odd, none, space and mark parity. On chip 256 byte FIFO buffers in transmit, receive path

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

1. PCIE-SE2 allow users add 2X RS232 BD9 serial Ports on desktop PCs or industrial devices by PCI Express slot.

2. Seamless connect to serial ports device such as POS system, industrial testing and control device, security system, logistic management equipment, scanners and printers.

3. Need to install driver on Windows XP, Vista, 7, 8.x, 10, 11 (32/64bit) systems. Linux kernel 2.6.x, 3.x, 4.x, 5.x need to refer compile source code in the driver CD.

ASIX AX99100 chipset

Bi-directional speeds from 50bps to 16Mbps/port

Support for D1, D2, D3hot and D3cold

Compliant with PCI Express Specification Rev 1.1

Compatible with 16C550/16C552/16C554 and 16C750 UART

Supports 256-byte FIFO buffer; Supports 5-6-7-8-bit serial format; Data transfer rate up to 115Kbps on each port

PCI-E Specification Revision 1.0A

Support for D1, D2, and D3hot and D3cold

Compatible UART: 16C450/550/extended 550

Easily Add 2 Serial Ports and 1 Parallel Port To Any Computer

Add one IEEE 1284 Parallel Port on system

Supports 2 x UART Serial Ports

Easily adds two serial port and one parallel port through an available PCI Express slot. 16C650 UART serial port with data transfer rate up to 250Kbps. Compliant with PCI Express 2.0 Gen 1. Compatible with IEEE 1284 -1994 parallel port standard for SPP/Byte/ECP Mode.

Single-lane (X1) PCI Express end-point controller with PHY integrated. Full serial modem control. Hardware and software flow control.

5, 6, 7, 8 and 9-bit serial format. Even, odd, none, space and mark parity. On chip 256 byte FIFO buffers in transmit, receive path.

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

Compliant with PCI Express Specification Rev 1.1

Parallel Port - Compliant with IEEE 1284 standard; Supports ECP/EPP/SPP; Supports Bi-Directional data transmission of speed up to 2MByte/s

Serial Port - Compatible with 16C550/16C552/16C554 and 16C750 UART; Supports 256-byte FIFO buffer; Supports 5-6-7-8-bit serial format; Data transfer rate up to 115Kbps on each port

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

It is easy to allow more serial and parallel devices to be connected to your computer.

Two 9-pin RS-232 DB9 external serial ports and one DB 25 external parallel LPT port.

Complies with PCI Express Specification Revision 1.1.

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