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StarTech.com 8-Port PCI Express RS232 Serial Adapter Card – PCIe to Serial DB9 RS232 Controller Card – 16C1050 UART – 15kV ESD – Win/Linux

$254.76

Add eight RS-232 DB9 serial ports to your desktop computer, through a PCIe expansion card slots. This PCI express serial card, with 8-port breakout cable, provides you with multiple ports to connect a wide variety of serial peripherals, at speeds of up to 921.4Kbps.

Connect your Peripherals with 8 Serial Ports

The PCI express serial port card makes it easy to add serial ports to connect your peripherals including printers, scanners, credit/debit card readers, PIN pads and modems, industrial controls and more. The 8 port PCIe serial card includes a breakout cable - with 8 DB9 connectors.

Maximum Compatibility

With broad OS support, including for Windows and Linux, this PCI Express card is easy to integrate into mixed environments.

PEX8S1050 is backed by a StarTech.com lifetime warranty and free lifetime technical support.


  • 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
  • VERSATILE APPLICATIONS: PCI Express RS232 serial adapter card for within point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanners, oscilloscope
  • STARTECH.COM ADVANTAGE: IT professionals choice for over 30 years; PCIe RS232 Serial expansion card is backed for life by StarTech.com, incl. free 24/5 North America based multi-lingual tech support

4 Port Pcie Serial Card

$195.60

The PEX4S232485 4 Port PCI Express PCIe Serial Combo Card - 2 x RS232 2 x RS422 / RS485 lets you add two RS232, and two RS422/485 serial ports to your PC through a PCI-Express expansion slot.

This PCI express serial card is a single card solution that is compatible with nearly any serial communication protocol, supporting RS-232, RS-422, RS-485 2-wire or RS-485 4-wire operating modes.

A flexible solution for adding serial ports to full-sized, or small form factor systems, the 4-port serial card includes both low and full profile brackets while the included breakout cable helps to avoid cluttered connections.

Backed by a StarTech.com lifetime warranty and free lifetime technical support.

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  • Supports PCI Power Management 1.1
  • Compliant with PCI-Express Specification 1.0a
  • Standard and low-profile bracket included
  • 256-byte deep FIFO per transmitter and receiver
  • Supports 2-Wire / 4-Wire RS485 modes
  • RS232 data transfer rates up to 460 Kbps
  • 4 port (2 x RS232, 2 x RS422/485) serial combo card

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

$116.09

This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. The 4 port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps.

Maximum Compatibility

With broad OS support, including for Windows and Linux, this PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with low-profile brackets and includes optional full-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PEX4S952LP.

Experience Optimal Technology
  • This PCIe to serial adapter supports the following features:
  • Compatible with industry-standard 16950 UART
  • Supports max baud rate of up-to 921.6Kbps
  • Provides 5/12V power output on Pin 9 when external power is connected
  • 256-byte depth FIFO cache per transmitter and receiver
  • Supports 9, 8, 7, 6, 5 data bits (one per port)
  • Asix AX99100 chipset

PCI Express 1.1 compliant

The Choice of IT Pros Since 1985

StarTech.com conducts thorough compatibility and performance testing on all our products to ensure we are meeting or exceeding industry standards and providing high-quality products to IT Professionals. Our local StarTech.com Technical Advisors have broad product expertise and work directly with our StarTech.com Engineers to provide support for our customers both pre and post-sales.

PEX4S03LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.


  • 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
  • VERSATILE APPLICATIONS: For low/standard profile desktop/servers w/ uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanner, oscilloscope
  • STARTECH.COM ADVANTAGE: IT professionals choice for over 30 years; PCI-e RS232 Serial expansion card is backed for life by StarTech.com, incl. free 24/5 North America based multi-lingual tech support

Brainboxes 2 Port RS232 Ethernet to Serial Adapter

$197.51

Ethernet to Serial device server providing access to two RS232 serial ports. Data transfer rates up to 1,000,000 baud, coupled with 1Mbit/s line drivers deliver uncompromising performance.

Our ES range provides simple instant networked serial ports. A web interface allows secure configuration and control of the serial ports over a local network or the internet using any browser.

For Windows our in-house designed (32 bit and 64 bit) driver gives you local COM ports, retaining existing software applications and allowing you to connect across your network to remote devices just as if they were attached locally.

Serial Port Tunnelling (individually configurable) allows serial cable replacement over any distance, no software required. You can access the device via TCP/IP sockets from any networked device like an Android tablet, PC or phone. On Windows OS TCP/IP sockets are handled by the Winsock API, this will differ on other OSs.

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  • Power supply included (power input 5-30V DC)
  • Serial Port Tunnelling allows serial cable replacement over any distance, no software required
  • Install Virtual Com ports or use the Software APIs for Visual Basic, C# and more
  • 2 Port RS-232
  • Ethernet to Serial Device Server
  • Data rate from 110 to 1,000,000 baud

Brainboxes Industrial Ethernet to Serial 2xRS232/422/485

$408.38

Ethernet to Serial Device with 2 Port software selectable as RS232, RS422/485 Full duplex or RS422 Half duplex. ES-522 has removable Screw Terminals Blocks for easy wiring, a slim 'end on' case and integral DIN rail mount. Our Industrial Ethernet to Serial has an operating temperature range of -30 to +80 degrees Celsius and with +5VDC to +30VDC Dual input reverse polarity protected power supply making it perfect for industrial applications. Data transfer rates up to 1,000,000 baud (1 MegaBaud), coupled with 1Mbit/s line drivers deliver uncompromising performance. Baud rates can be standard values such as 9,600, 115,200, 230,000, 921,600 or user definable non standard values.

Our Industrial ES range provides simple instant networked serial ports in demanding environments. Serial Port Tunnelling (peer to peer) allows serial cable replacement over any distance, no software required. Suitable to be wired into existing power and network infrastructure or can be used with our PW-600 power supply.

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  • -40°C to +80°C/-40�F to +176�F Temperature range
  • Robust, Slim Design, Integrated DIN rail mount
  • Serial Port Tunnelling allows serial cable replacement over any distance, no software required
  • Install Virtual Com ports in Windows, tunnel over ethernet between 2 devices, communicate over TCP/IP or use the Software APIs for Visual Basic, C# and more
  • Data rate from 110 to 921,600 baud (1 MegaBaud). Removable, colour-coded, number terminal blocks
  • 2 Port RS-232/422/485 Industrial Ethernet to Serial Device Server

SIIG DP CyberSerial 2S PCI

$68.13

SIIG's DP CyberSerial 2S PCI adds 2 high-speed 16550 UART serial ports (9-pin) to your desktop computer. Each serial port can be configured as either standard 5V or 12V power output for connecting serial devices that require power such as 56K V.90 external modems, ISDN terminal adapters, PDAs, digital cameras, label printers and more. With a spare low profile bracket, this dual profile adapter card can be installed into standard height or low profile chassis system, offering the utmost flexibility in system installations.

4 Port Pci Express Rs232 Card

$116.09
This PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot, as if they were native serial ports. The 4 port PCIe serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 921.6Kbps. Maximum Compatibility

With broad OS support, including for Windows and Linux, this multiport PCI E serial card is easy to integrate into mixed environments. The card comes pre-configured with a full-sized bracket, and includes an optional low-profile bracket, so installation is easy regardless of the case form factor. This expansion card is a direct replacement for PEX4S952.

Experience Optimal Technology

This PCIe to serial adapter supports the following features:

  • Industry standard 16950 UART compatible
  • Supports max baud rate of up-to 921.6Kbps
  • Provides 5/12V power output on Pin 9 when external power is connected
  • 256-byte depth FIFO cache per transmitter and receiver
  • Supports 9, 8, 7, 6, 5 data bits (one per port)
  • Asix AX99100 chipset
  • Base PCI Express 1.1 compliant
The Choice of IT Pros Since 1985

StarTech.com conducts thorough compatibility and performance testing on all our products to ensure we are meeting or exceeding industry standards and providing high-quality products to IT Professionals. Our local StarTech.com Technical Advisors have broad product expertise and work directly with our StarTech.com Engineers to provide support for our customers both pre and post-sales.

PEX4S953 is backed by a StarTech.com lifetime warranty and free lifetime technical support.


  • 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
  • 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
  • VERSATILE APPLICATIONS: For standard profile desktop/servers with uses in point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanners, oscilloscope
  • STARTECH.COM ADVANTAGE: IT professionals choice for over 30 years; PCI-e RS232 Serial expansion card is backed for life by StarTech.com, incl. free 24/5 North America based multi-lingual tech support

Advantech 8-port RS-232/422/485 PCI Express Communication Card

$198.52

PCIE-1620 is an 8-port RS-232, and PCIE-1622 is an 8-port RS-232/422/485 PCI Express communication cards that are compatible with the PCI Express x 1 specification. The cards provide eight EFT protected RS-232/422/485 ports up to 2,500 VDC, and have many functions such as high transmission speed of 921.6 kbps; either eight independent RS-232 ports or eight independent RS-232/422/485 ports which comes with high-performance PCIe958 UARTs with 128-byte FIFO to reduce CPU load. Thus, the PCIE-1620/ PCIE-1622 are especially suitable for making your system reliable in multitasking environments.


  • PCI Express bus 2.0 compliant
  • Speeds up to 921.6 kbps for extremely fast data transmission
  • Supports any baud rate setting
  • 8 x RS-232 or RS-232/422/485 ports
  • XR17V358 UART with 256-byte FIFOs

4 Port Pci Express Serial Card

$151.34

The PEX4S553B 4-Port PCI Express Serial Card (with breakout cable) lets you add 4 RS232 serial ports using a single PCIe expansion slot, with an included 1-to-4 cable enabling you to add 4 serial ports to a single low profile slot.

The serial card features a native single-chip design that provides optimum reliability and speed, reducing the CPU load by up to 48% over conventional bridge-chip serial cards - a cost-effective solution for connecting legacy serial devices to PCIe-enabled computers.

The multi-port serial adapter includes both full profile and low profile/half-height brackets for compatibility with standard and small form factor computers, and is compatible with a broad range of operating systems, including Windows®, Linux, and MAC OS.

This product is a replacement for our PEX4S552B card.

Backed by a StarTech.com lifetime warranty and free lifetime technical support.

More from the Manufacturer


  • Automated out-of-band flow control using CTS/RTS and DSR/DTR
  • Compliant with PCI Express base specifications revision 1.0a
  • Supports data transfer rates up to 250Kbps on each port
  • Single-Lane (x1) PCI-Express with throughput up to 2.5Gbps
  • Supports hardware and software flow control
  • On chip 256-byte depth FIFO in transmit/receive path of each port
  • Native single chip design
  • Includes a full profile and low profile/half-height bracket

StarTech.com 2-Port PCI RS232 Serial Adapter Card, Dual Serial DB9 Ports, Expansion/Controller Card, Windows/Linux, Standard/Low Profile

$38.15

This multiport PCI RS232 serial adapter card lets you add two RS232 (DB9) serial ports to your computer through a PCI slot, as if they were native serial ports. The dual port PCI serial card enables you to interact with serial devices, such as card readers, printers, PIN pads, and modems, at speeds of up to 115.2Kbps.

Maximum Compatibility

With broad OS support, including for Windows (7 and up), and Linux (2.6.x to 5.x LTS versions only), this 2 port PCI serial card is easy to integrate into mixed environments. The card comes pre-configured with a full-profile bracket, and includes optional low-profile brackets, so installation is easy regardless of the case form factor. This card is a direct replacement for PCI2S550_LP and PCI2S550.

Experience Optimal Technology

This PCI to serial adapter supports the following features:

  • Industry standard 16C550 UART compatible
  • Supports baud rate up-to 115.2Kbps
  • 256-byte depth FIFO cache per transmitter and receiver
  • Supports 9, 8, 7, 6, 5 data bits (one per port)
  • Asix MCS9865 chipset
  • Low and full-profile brackets included

PCI2S5502 is backed by a StarTech.com lifetime warranty with free 24/5 multi-lingual North American based technical support. StarTech.com has been the IT professionals' choice for over 30 years.


  • 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
  • STANDARD PROFILE & LOW PROFILE BRACKET: PCI multiport serial COM card installs using 1x standard bracket (pre-installed) or 2x low profile brackets (incl); Supports Windows 7 and up, Linux 2.6.x to 5.x
  • STARTECH.COM ADVANTAGE: IT professionals choice for over 30 years; PCI RS-232 Serial expansion card is backed for life by StarTech.com, incl. free 24/5 North America based multi-lingual tech support

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

$490.81

This PCI Express serial card adds 16 high-speed RS232 ports to your standard or low-profile desktop or server PC. This lets you maximize the number of available DB9 RS232 ports that are available for connecting your serial-based devices and equipment, while using only a single PCI Express (PCIe) slot. It's the perfect solution for adding the serial ports you need, even if your desktop PC or server only has a limited number of PCIe expansion slots.

Add 16 RS232 ports through one PCIe slot

You can install the serial card to add 16 high-performance DB9 RS232 serial ports from a single PCIe slot. With two breakout cables of 8 ports each, the PCIe serial card maximizes the density of DB9 RS232 ports on a server or desktop computer. It's ideal for system upgrades in a wide range of applications, including manufacturing equipment, POS equipment, security devices such as surveillance cameras, and environment or building control systems.

The serial card is compliant with PCI Express 1.0a specification, and it's compatible with 1x, 2x, 4x, 8x and 16x PCI Express slots.

High-speed serial communication

The PCIe serial card delivers high-performance, high-speed serial communication, with support for data transfer rates of up to 921.6 Kbps.

Easy installation

The serial card is easy to install and configure, and compatible with a broad range of Windows® and Linux® operating systems. The card features IRQ sharing and supports plug-and-play serial device connections, which makes it convenient and easy to connect serial devices. It includes a low-profile bracket making it compatible with both full profile and low profile PC chassis slots.

The PEX16S550LP is backed by a StarTech.com 2-year warranty and free lifetime technical support.


  • 16 DB9 RS232 ports from a single PCIe slot
  • Enables high-speed serial communication with data transfer rates up to 921.6 Kbps
  • Compatible with low- and full-profile desktop computers or servers
  • Fully compliant with PCI Express 1.0a/1.1 specification, compatible with 1x, 2x, 4x, 8x, and 16x PCIe bus
  • +/-15kV ESD protection
  • Selectable power output (5V or 12V ) on pin 9 for the serial port
  • Data Bits: 5, 6, 7, or 8-bit characters
  • Windows and Linux support

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

$100.29

The MPEX4S952 4-Port RS232 Mini PCI Express Serial Card (16650 UART) turns a mini-PCIe slot into four RS232 (DB9) serial ports with data rates up to 921.6 Kbps - a cost-saving solution for adding serial support to embedded systems missing the functionality.

A native PCIe single-chip design enables you to take advantage of full PCI Express bus capability, by providing improved speed and reliability while reducing the load applied to the CPU by as much as 48% over conventional "bridge chip" serial cards .

Backed by a StarTech.com Lifetime Warranty and free lifetime technical support.

More from the Manufacturer


  • Compliant with PCI Express base specifications revision 1.1
  • Automated out-of-band hardware flow control using RTS/CTS
  • In-band software flow control, using programmable Xon/Xoff in both directions
  • Native single-chip, single lane PCI Express
  • Includes 4x 30cm IDC to DB9 serial cables
  • 256-byte deep FIFO per transmitter and receiver
  • High Performance 16650 UART
  • Four high speed RS232 serial ports with data transfer rates up to 921.6 Kbps

StarTech.com 8-Port PCI Express RS232 Serial Adapter Card -PCIe to Serial DB9 Controller 16C1050 UART – Low Profile – 15kV ESD – Win/Linux

$214.80

Add eight RS-232 DB9 serial ports to your desktop computer, through two PCIe expansion card slots. This PCI express serial card, with two breakout cables, provides you with multiple ports to connect a wide variety of serial peripherals, at speeds of up to 921.4Kbps.

Connect your Peripherals with 8 Serial Ports

The PCI express serial port card makes it easy to add serial ports to connect your peripherals including printers, scanners, credit/debit card readers, PIN pads and modems, industrial controls and more. The 8 port PCIe serial card includes 2 breakout cables - each with 4 DB9 connectors.

Versatile Use

The low profile PCIe serial card is the ideal choice for adding serial ports, even when space is at a premium. The DB9 serial card is designed to fit into small form factor and standard computer cases. The card comes pre-configured with a low-profile bracket, and includes two optional full-profile brackets, so installation is easy regardless of the case form factor.

Maximum Compatibility

With broad OS support, including for Windows and Linux, this PCI Express card is easy to integrate into mixed environments.

PEX8S1050LP is backed by a StarTech.com lifetime warranty and free lifetime technical support.


  • 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
  • OPTIONAL CONFIGURABLE POWER: Multiport serial card provides 12v/5v, or none on pin 9 w/up to 3A total shared; 2 (1xDB44 to 4xDB9) breakout cables incl; Hex nuts incl for opt screw or nut DB9 interface
  • COMPATABILITY: 2 low profile brackets for PCI-e 1x card; Fully compliant w/ PCI Express Base Spec, Revision 1.0a/1.1; Supports Windows (incl. XP and up) and Linux; For low profile desktop/servers
  • VERSATILE APPLICATIONS: PCI Express RS232 serial adapter card for within point of sale terminals, PLCs, control/automation in factories, scientific sensors, medical equipment, scanners, oscilloscope
  • STARTECH.COM ADVANTAGE: IT professionals choice for over 30 years; PCIe RS232 Serial expansion card is backed for life by StarTech.com, incl. free 24/5 North America based multi-lingual tech support

SIIG DP CyberSerial 4S PCIe Board

$129.99

Adds four RS-232 serial ports to PCI Express enabled computer systems. Replaces part # JJ-E40011-S4

Note: Replaces part # JJ-E40011-S4

  • Easily adds four RS232 DB9 serial ports through an available PCI Express slot
  • PCI Express 1-lane (x1) adapter works with any width PCI Express slot
  • Four high-speed 16550 UART RS-232 serial ports support asynchronous baud rates up to 921Kbps
  • Built-in 256-byte FIFO buffers dramatically increase data transmit/receive speed, especially under Windows multitasking environment
  • Works as standard RS-232 port or with 5V or 12V power output for devices that require power (such as handheld scanners, table scanners, POS displays, etc.) Power is configurable via jumpers with silk-screened settings on PCB for easy identification and setup
  • Supports hardware and software flow control, 5, 6, 7, 8 and 9-bit serial format
  • Onboard power connector provides reliable power source for devices that require power
  • Dual-profile PCB design fits full size and low-profile system form factor with included full and low profile brackets

More from the Manufacturer