StarTech.com 2-Port Serial PCIe Card, Dual-Port PCI Express to RS232/RS422/RS485 Hub

The StarTech.com 2-Port Serial PCIe Card expands your ports in seconds — plug in and go.

Add two 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 2-Port Serial PCI Express Card. The two 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 2-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	2
Host interface	PCIe
Expansion card standard	PCIe 2.0
Technical details
Chipset	ASIX - AX99100
FIFO (First In, First Out)	256 B
Sustainability compliance	Yes
Compliance certificates	RoHS, Trade Agreements Act (TAA)
Performance
Stop bits	1, 1.5, 2
Data bits	5, 6, 7, 8, 9
Baud rate	921.6 Kbit/s
Flow control support	Yes
Product colour	Black
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 11 Enterprise x64, Windows 7 Professional x64, Windows 8.1 Pro, Windows 10, Windows 11 Home, Windows 7 Starter, Windows 8.1 Pro x64, Windows 10 Education, Windows 11 Pro, Windows 7 Starter x64, Windows 8.1 x64, Windows 10 Education x64, Windows 11 x64, Windows 7 Ultimate, Windows 10 Enterprise, Windows 7 Ultimate x64, Windows 10 Enterprise x64, Windows 7 x64, Windows 10 Home, Windows 8, Windows 10 Home x64, Windows 7, Windows 8 Enterprise, Windows 10 IOT Core, Windows 7 Enterprise, Windows 8 Enterprise x64, Windows 10 IoT Enterprise, Windows 7 Enterprise x64, Windows 8 Pro, Windows 10 Pro, Windows 7 Home Basic, Windows 8 Pro x64, Windows 10 Pro x64, Windows 7 Home Basic x64, Windows 8 x64, Windows 10 x64, Windows 7 Home Premium, Windows 8.1, Windows 11, Windows 7 Home Premium x64, Windows 8.1 Enterprise, Windows 11 Enterprise, Windows 7 Professional, Windows 8.1 Enterprise x64
Linux operating systems supported	Yes
Server operating systems supported	Windows Server 2016, Windows Server 2019, Windows Server 2022
Weight & dimensions
Width	102 mm
Depth	105 mm
Height	16 mm
Weight	57 g
Package width	144 mm
Package depth	174 mm
Package height	32 mm
Package weight	147.6 g
Packaging data
Mounting brackets included	Yes
Cables included	Ribbon cable
Quick installation guide	Yes
Logistics data
Products per master (outer) case	75 pc(s)
Master (outer) case width	685 mm
Master (outer) case length	355 mm
Master (outer) case height	310 mm
Other features
Electrostatic Discharge (ESD) protection	15 kV

Downloads

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