M.2 (Key M/B) to Dual RS232 Serial Port Adapter Card 2-Port COM DB9 Expansion Card, PCIe 2.0 Gen1 x1 Interface, Industrial-Grade Converter Compatible with Terminal & Embedded Systems

AoQhir M. 2 (Key M/B) to Dual RS232 Serial Port Adapter Card 2-Port COM DB9 Expansion Card, PCIe 2.0 Gen1 x1 Interface, Industrial-Grade Converter Compatible with POS, Modem Product Description This M. 2 to Dual RS232 Serial Port Adapter Card converts your motherboards M. 2 slot (Key M or Key B) into two standard DB9 RS232 serial ports, allowing you to connect and communicate with multiple serial devices simultaneously. Built on PCIe 2.0 Gen1 x1 interface, it provides full-duplex bidirectional communication at up to 921, 600 bps baud rate, making it ideal for industrial automation, data acquisition, and embedded system integration.

The adapter supports 16550-compatible UART registers, with 256-byte TX/RX FIF
Os and two independent UART channels for reliable high-speed data transmission. Its designed for connecting terminals, modems, barcode scanners, cash registers, ISDN adapters, serial printers, and other RS232-based devices.
Technical

Specifications

Interface Type: M. 2 (Key M or Key B), PCIe 2.0 Gen1 x1 Number of
Ports: 2 × RS232 (DB9 male connectors)
Baud Rate: 300 bps 921, 600 bps
UART Type: 16550 compatible with 256-byte TX/RX FIF
Os Data Bits: 4, 5, 6, 7, 8
Stop Bits: 1, 1.5, 2
Parity: None, Even, Odd, Mark, Space
Flow Control: None, Hardware (Compatible with RTS/CTS), Software (Compatible with Xon/Xoff)
RS232 Signals: DCD, RXD, TXD, DTR, GND, DSR, RTS, CTS, RI
Operating Temperature: -40°C to +85°C (-40°F to +185°F)
Storage Temperature: -65°C to +150°C (-85°F to +302°F) Application Scenarios Industrial automation and control systems POS machines and cash register systems Barcode scanners, printers, and modems Embedded computing and Mini-ITX platforms Server and gateway serial communication