AUM-500 (High speed USB To  RS-232 TX/RX Cable)
Features Specification
  • Fully Compliant with USB Specification v2.0 (Full-Speed) 
  • UHCI / OHCI (USB1.1), EHCI (USB2.0), xHCI(USB3.0) Host Controller Compatible
  • Meets EIA/TIA-232F standards
  • Guaranteed 1000kbps transmission rate under loading
  • Three RS232 Driver / Five RS232 Receivers
  • Full-duplex transmitter and receiver (TXD and RXD)
  • W / O Six MODEM control pins (RTS, CTS, DTR, DSR, DCD, and RI)
  • 5,6,7 or 8 data bits
  • Odd, Even, Mark, Space, or None parity mode
  • One, one and a half, or two stop bits
  • Parity error, frame error, and serial break detection
  • Programmable baud from 75 bps to 1M bps
  • Provides RS232 power down indicator pin
  • Works with existing PC COM Port software applications
  • Automatic software flow control with XON/XOFF
  • Provides royalty-free Virtual COM Port (VCP) driver for:
  • Windows 2000, XP, Vista, and 7(Microsoft Certified WHQL Logo Drivers)
  • Windows Server 2003, 2008, 2008 R2
  •  Windows 8
  • Windows CE4.2, 5.0, 6.0, and Windows Embedded Compact 7
  • Windows XP Embedded (XPe), Point--of-Service (WEPOS), and POS Ready
  • MAC OS 8/9, OSX
  • Linux/Android kernel 2.4.31 and above includes built-in driver
  •  -40C to 85 C Operating Temperature
  • ESD Protection for RS-232 I/O' +-15KV
  • RS-232 for DTE Mode use PL2303RA Chipset
  • Weight : 35g
  • Length : 1m 
  • Audio Pin assignment

Pin1 : RXD  <== IN

Pin2 : TXD   ==> OUT

Pin3 : GND

DTR    ==>  DSR

 RTS   ==>  CTS

DCD and RI  ==  NO USE