USB RS-232 serial adapter with LED indicators . Introduction: this adapter is the easiest way to add a serial port to your computer. Many PDA's digital cameras, GPS units, barcode scanners and other equipment require a serial connection and many newer computers don't have serial ports. This adapter also allows you to monitor the status of your connections by marking them with LEDs, which flash when there is activity on the pins. Details: the FTDI-LED offers an advanced FTDI chipset, USB to RS-232 connection with double color LED display of full signal power. The device is powered individually by the USB port. This device is easy to install, it features a plug & play easy test RS-232 host to device link. Device support: PDA RS-232 port support 56K modem support serial mouse support+ serial PC camera support. Fully compliant with USB spec2.0 compliant USB spec 1.1. RS-232 - DB9/M data rate : over 1000kbps. ESD protection for RS-232 I/O' +-15KV RS-232 for DTE mode. LED color: 1~4, 6~9 pin signal 0 : green/signal 1 : red GND - red - power PS. DB9-F pin/1,2,6,8,9 no input LED no light , DCD , RXD, TXD, DTR , GND,DSR ,RTS ,CTS , RI, easy test RS-232 host to device link. OS support: windows 98,ME, XP, 2000, 2003, CE, vista, windows 7, windows 8 and windows 10 supported! Linux and mac OS 10.X.