StarTech 2-Port PCIe RS232 Serial Card | 16950 UART | PEX2S953

The StarTech PEX2S953 delivers dual RS232 serial connectivity through a single PCIe slot, engineered for demanding computing environments. Built on the ASIX AX99100 chipset with 16950 UART architecture, this adapter achieves 921.6Kbps bidirectional throughput per port while maintaining low CPU overhead via its 256-byte FIFO buffer. Each DB9 port features independently configurable Pin 9 output—selectable between 5V, 12V, or disabled—accommodating diverse peripheral power requirements. The card ships with standard and low-profile mounting brackets, enabling deployment across multiple system configurations. TAA-compliant and validated for Windows and Linux environments, the PEX2S953 integrates seamlessly into x1, x4, x8, or x16 PCIe slots for legacy serial device integration in modern infrastructure.

Features:
High-Speed Connectivity: Supports bidirectional RS232 data transfer rates of up to 921.6Kbps per port.
Advanced Chipset: Utilizes the ASIX AX99100 chipset with a 16950 UART for reliable performance.
Configurable Power: Pin 9 on each port is individually configurable to output 5V, 12V, or no power.
Dual Profile Design: Comes with a standard bracket pre-installed and includes two low-profile brackets for versatile installation.
Broad Compatibility: Fully compatible with Windows and Linux operating systems; TAA compliant.

Specifications:
Interface: PCI Express 1.1 x1 (Compatible with x1, x4, x8, x16 slots)
Ports: 2 x DB9 (9 pin, D-Sub) RS-232 Serial
UART: 16950
FIFO: 256 Bytes per port
Max Baud Rate: 921.6 Kbps
Power Output: 5V / 12V / None (Selectable via Pin 9)
Chipset ID: ASIX AX99100
Weight: 2.0 oz [56 g]