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

1. This FS-U2S-Pro is a PCIE X1 interface to 2X 5Gbps (USB-A ports) USB 3.0 expansion card. Allow users add 2X 5Gbps max USB-A ports on Desktop PCs, MAC Pros, Working Stations, and NAS Data Centers for large data transfers. It will light up 2X USB 3.0 devices which including USB keyboard, USB mice, USB speakers, USB KVM switch, USB HUB, USB flash drive, printers, game pad, smartphone, tablet, and more USB-A interface devices.

2. Built in FebSmart Self-Powered Technology, users do not need to plug any additional power cable from PCs power supply unit. Allow each 5Gbps USB-A port get 5V/2A (5V/4A in total) max power supply for high-power consuming USB 3.0 devices (NOT support fast charging) such as indusrial cameras, VR-Systems, USB 3.0 NVME enclosures, USB SATA HDD/SSD enclosures, live broadcast devices, USB 3.0 video adapters and USB 3.0 universal docking stations.

3. Based on ASMedia ASM1042 5Gbps 5Gbps USB 3.0 host controller, will compatible with ARM, AMD, MAC, and Intel hardware platform Desktop PCs. FebSmart built in 2X voltage transformers to pick up 12V power from motherboard and covert to 5V/4A in total power supply for 2X USB 3.0 devices power consumption. Febsmart also designed 2X electronic safty fuse, 2X voltage stable capacitor and 2X voltage stable inductance to protect USB 3.0 devices and users data safety.

1. FS-U4-Pro is a PCIE X1 interface to 4-Ports USB 3.0 expansion card. Allow users add 4X 5Gbps max USB-A ports on Desktop PCs, Working Stations, and NAS Data Centers. It will light up 4X high power consumption USB 3.0 devices which including indusrial cameras, VR-systems, USB 3.0 NVME enclosures, live broadcast devices, USB 3.0 SSD/HDD enclusures, USB 3.0 video adapters and USB 3.0 universal docking stations.

2. Based on 1X RENESAS UPD720201 5Gbps USB 3.0 host controller will compatible with AMD, ARM, and Intel harware platform Desktop PCs. The 4X added-on USB-A ports will share 5Gbps total bandwidth. It will also compatible with 4X normal USB devices such as USB keyboard, USB mice, USB speakers, USB KVM switch, USB HUB, USB flash drive, printers, game pad, smartphone, tablet, and more USB-A interface devices.

3. Built in FebSmart Self-Powered Technology, no need to plug any additional power cables from Desktop PCs power supply unit. Allow each USB 3.0 port get 5V/2A 10W max (5V/8A 40W in total) power supply from motherboard directly for connected high power consumption USB 3.0 devices. FebSmart add 4X electronic safty fuse and 4X voltage stable capacitor and 4X voltage stable inductance on the USB expansion card, will protect users data and USB 3.0 devices, make sure connection safty.

* Simple to Use : NO Driver required Plug and play, support 2.5 inch solid state drive, 2.5 inch mechanical hard drive, 2.5 inch Blu-ray drive, 3.5 inch mechanical hard drive, 3.5 inch Blu-ray drive, etc. It is widely applied as start-up disk, support hot swappable.

* SATA 3.0 & PCIE V3.0 : Support SATA transfer rate: SATA 3 (6Gbps), SATA 2 (3Gbps), SATA 1 (1.5Gbps). Compliant with PCI-Express specification V3.0 and backward compatible with V2.0. PCI-Express X4 interface, and compatible with PCI-Express X4/X8/X16 slots(recommended to use under PCI-E 3.0, faster).

* 6 Ports Adapter Card --- You could add 6 6Gbp/s SATA 3.0 devices to your computer with this PCIe SATA card.(4X bidirectional bandwidth theoretical speed up to 8GB/S) ,Support Intelligent Sleep - If you do not operate the computer for 3 minutes, the hard disk will enters an automatic sleep mode , and will automatically activates when rewriting data.

1. FS-U4L-Pro is a PCIE X1 interface to 4-Ports USB 3.0 expansion card. Allow users add 4X 5Gbps max vertical USB-A ports on Desktop PCs, Working Stations, and NAS Data Centers. It will light up 4X high power consumption USB 3.0 devices which including indusrial cameras, VR-systems, USB 3.0 NVME enclosures, live broadcast devices, USB 3.0 SSD/HDD enclusures, USB 3.0 video adapters and USB 3.0 universal docking stations.

2. Based on 1X RENESAS UPD720201 5Gbps USB 3.0 host controller will compatible with AMD, ARM, and Intel harware platform Desktop PCs. The 4X added-on vertical USB-A ports will share 5Gbps total bandwidth. It will also compatible with 4X normal USB devices such as USB keyboard, USB mice, USB speakers, USB KVM switch, USB HUB, USB flash drive, printers, game pad, smartphone, tablet, and more USB-A interface devices.

3. Built in FebSmart Self-Powered Technology, no need to plug any additional power cables from Desktop PCs power supply unit. Allow each USB 3.0 port get 5V/2A 10W max (5V/8A 40W in total) power supply from motherboard directly for connected high power consumption USB 3.0 devices. FebSmart add 4X electronic safty fuse and 4X voltage stable capacitor and 4X voltage stable inductance on the USB expansion card, will protect users data and USB 3.0 devices, make sure connection safty.

✔The adapter has 4 independent 18-pin standard serial ports, such as the integrated serial interface, which makes the connection more stable.

✔The adapter is a PCI-E 4-port ASM1064 Chipset serial port card, which has 4 standard SATA ports.

✔Data transfer rates of up to 6 Gbps on each port, Compatible with Windows 10 /11 / synology /Ubuntu.

✅ 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

MCS9922 Chipset

Compatible with Industrial Standard 16C550 UART. On Chip 256-byte Depth FIFO in Transmit.

Transfer data rates up to 250Kbps on each port. Supports hardware and software flow control. Supports 5, 6, 7, 8-bit Serial format

Chipset: ASMedia 1064

4 Internal SATA 6Gb/s Ports. SATA ports are bootable

Compliant with Serial ATA Specification 3.0. Hot Plug and Hot Swap

The 16-Port SATA controller expansion card is compatible host PCie X1/X4/X8/X16 card slot.Supports SATA III transfer speeds up to 6.0Gbp.

The PCIe SATA card contains 16 SATA cables to simplify the connection.Connect 16 mass storage devices at the same time.

Use the 1X ASM1064+3*JMB575 Chip PCIE 3.0 Serial controller to effectively improve compatibility and stability.

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.

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.

Fully Compliant with Industry standard PCIe 3.0 Slots

Integrated, High-Performance

Native, in-box NVMe driver support

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.

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

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.

2-port PCI serial card turns a PCI expansion slot into 2 RS-232 DB9 serial port for your computer to connect multiple legacy serial devices

Dual serial port card supports IRQ sharing and operates flawlessly with Windows 10, 8, 7, Vista, XP, 2000, ME, 98,etc; PCI 2.1 specification, Standard 16C550 UART signal

PCI card bracket with two RS232 serial interface uses WCH chip, data communication transfer rate up to 115.2 Kbps

ASIX AX99100 chipset

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

Support for D1, D2, D3hot and D3cold

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.

Second generation 6Gb/s SATA+SAS with unprecedented levels of performance

Ideal for internal storage environments using up to 128 SAS, SATA and solid state drives (SSDs)

Unsurpassed IOPs performance and advanced software options help users realize full benefits of SSD deployments

Part Number: UP158

MPN: 0UP158, CN-0UP158, CP102U

Type: Smart PCI Serial

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.

PCI-Express 1X interface conforms to PCI-Express 1.0a standard.

Supports PCI-E 4X / 8X / 16X slots.

The card provide 4-port RS-232 9 Pin module.

SIIG IO Card JJ-P49012-S7 CyberSerial 4S 950 PCI 4-Port Serial Adapter with 16950 Controller Card (JJ-P49012-S7)

Siig JJ-P49012-S7