StarTech 4 Port RS232 RS422 RS485 PCIe Serial Card 16C1050 UART

StarTech 4 Port RS232 RS422 RS485 PCIe Serial Card adds four external DB9 serial ports to a desktop PC through a PCI Express interface, with each port selectable between RS232, RS422 and RS485 modes.

This card provides a straightforward way to connect legacy industrial hardware, point-of-sale systems and specialised equipment where modern interfaces are unavailable. It is suited to devices such as card readers, barcode scanners, label printers and console management systems when integrated into contemporary computer setups. The model is listed as PS74ADF-SERIAL-CARD.

Key Features

• Four external DB9 serial ports for desktop PCs
• Independent per-port selection of RS232, RS422 or RS485 using onboard DIP switches
• Configurable power on pin 9 for each port via an auxiliary SATA power connector
• Power options set by dedicated jumpers: 12V (1.5A per port), 5V (1.5A) or no power (RI)
• Asix AX99100 chipset with 16C1050 UART
• Compatible with legacy UART standards: 16C450, 16C550, 16C650, 16C750 and 16C950
• Maximum baud rate of 921.6 Kb/s per port
• 256-byte FIFO buffers and COM port retention for stable data transfer
• Parity modes: Even, Odd, None, Space and Mark
• ESD protection rated at ±8kV (Contact), ±15kV (Air) and ±15kV (HBM)

Installation and Compatibility

The card includes two standard-height brackets and four additional low-profile brackets. This allows installation in both standard and small form factor desktop cases. Dimensions are listed as 3 (width), 2.5 (depth) and 4 (height), and the card weighs 240 g.

Choose the StarTech 4 Port RS232 RS422 RS485 PCIe Serial Card when you need to add several serial ports with flexible per-port interface selection for legacy and specialised equipment.