StarTech.com 4-Port Serial PCIe Card, Quad-Port PCI Express to RS232/RS422/RS485 Hub

The StarTech.com 4-Port Serial PCIe Card expands your ports in seconds — plug in and go.

Add four RS-232, RS-422, or RS-485-capable DB9 Serial Ports to a desktop computer via PCIe x1 Expansion Card

Add serial communication support to a desktop computer or Small Form Factor (SFF) system, using this 4-Port Serial PCI Express Card. The four DB9 ports can be independently configured to support RS-232, RS-422, and 2/4-wire RS-485 standards, for communication with compliant serial peripheral devices.

Per-Port Serial Configuration

This PCIe Serial Card is equipped with on-board DIP switches, enabling each DB9 serial port to operate in RS-232, RS-422, and/or RS-485 mode(s). The card features LED indicators per port, providing real-time monitoring of port activity.

Configurable External SATA Power

The PCI Express Serial Adapter Card features three power modes that are configurable via on-board jumpers, including 12V (1.5A per port), 5V (1.5A per port), or no power (RI), over pin 9.

Legacy Connectivity

This serial card enables the continued use of legacy serial devices, preventing down time and avoiding costly upgrades. The 4-Port PCIe Serial Card is an ideal system upgrade for a wide range of applications (e.g., point-of-sale terminals, PLCs, factory control and automation, scientific sensors, medical equipment, scanners, and oscilloscopes)

Specifications

Ports & interfaces
Internal	Yes
Output interface	Serial
Serial interface type	RS-232/422/485
Serial ports quantity	4
Host interface	PCIe
Technical details
Chipset	ASIX - AX99100
FIFO (First In, First Out)	256 B
Cable length	0.3 m
Sustainability compliance	Yes
Compliance certificates	RoHS, Trade Agreements Act (TAA)
Performance
Stop bits	1, 1.5, 2
Data bits	5, 6, 8, 9
Baud rate	921.6 Kbit/s
Flow control support	Yes
Product colour	Black
Design
LED indicators	Activity
Features
Parity bit	Even, Mark, No, Odd, Space
Operational conditions
Operating temperature (T-T)	0 - 70 °C
Storage temperature (T-T)	-20 - 80 °C
Operating relative humidity (H-H)	20 - 80%
System requirements
Windows operating systems supported	Windows 10, Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 IOT Core, Windows 10 IoT Enterprise, Windows 10 Pro, Windows 10 Pro x64, Windows 10 x64, Windows 11, Windows 11 Enterprise, Windows 11 Enterprise x64, Windows 11 Home, Windows 11 Pro, Windows 11 x64, Windows 7, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 Home Premium, Windows 7 Home Premium x64, Windows 7 Professional, Windows 7 Professional x64, Windows 7 Starter, Windows 7 Starter x64, Windows 7 Ultimate, Windows 7 Ultimate x64, Windows 7 x64, Windows 8, Windows 8 Enterprise, Windows 8 Enterprise x64, Windows 8 Pro, Windows 8 Pro x64, Windows 8 x64, Windows 8.1, Windows 8.1 Enterprise, Windows 8.1 Enterprise x64, Windows 8.1 Pro, Windows 8.1 Pro x64, Windows 8.1 x64
Linux operating systems supported	Yes
Server operating systems supported	Windows Server 2016, Windows Server 2019, Windows Server 2022
Weight & dimensions
Width	109 mm
Depth	121 mm
Height	16 mm
Weight	60 g
Package width	145 mm
Package depth	212 mm
Package height	40 mm
Package weight	273.2 g
Packaging data
Mounting brackets included	Yes
Cables included	Ribbon cable
User guide	Yes
Logistics data
Products per master (outer) case	50 pc(s)
Master (outer) case width	685 mm
Master (outer) case length	345 mm
Master (outer) case height	306 mm
Other features
Electrostatic Discharge (ESD) protection	15 kV

Downloads

• Datasheet (PDF)
• Product manual / brochure (PDF)