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M.2 B+M Key to 4-port DB9 RS232 Serial Adapter

  • Product Code: M2-4S-9100
  • Availability: In Stock
  • Ships: Typically within 3 Business Days
  • Guarantee: 30-day Return and Money Back


The M.2 B+M Key AX99100 4-port Serial Adapter is a single chip solution that fully integrates PCIe 2.0 end-point controller. It has quad serial ports, which can be easily to expand more devices. The serial port supports RS-232 protocol and it has transmission speed up to 115200bps. It supports hardware and software flow control.


  • Single-lane(x1)PCI-Express End-point controller with PHY integrated
  • Compliant with PCI Express 2.0 Gen1
  • Compliant with PCI Express M.2 Specification version1.0
  • Compliant with PCI Power Management 1.2
  • Connector type: B+M KEY, size:22*80mm
  • Supports operating System: Linux kernel 4.x/3.x/2.6.x ,Windows XP/Vista/Win7/Win8/Win8.1/Win10 32/64bit

Serial port interface

  • Quad RS-232 port
  • Full serial Modem control
  • Supports hardware ,software Flow control
  • Supports 5,6,7,8 and 9-bit Serial format
  • Supports Even, Odd, None, Space and Mark Parity
  • Supports Custom baud rate by internal PLL
  • Supports on chip 256 Byte depth FIFOs in Transmit, Receive path of each serial port
  • Supports remote wakeup and power management features
  • Supports Slow IrDA mode(up to 115200bps) on all serial ports

Package content

  • 1 x M.2 B+M KEY AX99100 4-Port Serial Adapter
  • 1 x User Manual
  • 1 x Driver CD
  • 2 x High profile bracket
  • 2 x Low profile bracket 
  • 4 x 20CM DB9-9Pin serial cable

System Requirements

  • Linux, Windows XP/Vista/Win7/Win8/Win8.1/Win10 32bit or 64 bit
  • One available M.2 M key or B key slot

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