USB 2.0 RS-232 Serial Adapter 16 Inches w/ LED Indicators


This 16 inch USB to Serial adapter is a tool of choice when supporting serial peripherals in newer computers without serial support. Now supported by Windows 11, this is an ideal solution for device support.


  • LED activity monitoring
  • Full support of RS-232 signals
  • USB bus powered
  • 14 in. cable connection
  • Supports Windows 7, 8, 10, and 11, Linux, OSX

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Model #: GM-FTDI-LED16 Categories: , , , Tag:

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This USB 2.0 RS-232 Serial Adapter is 16 inches long the easiest way to add a serial port to your computer. Newer computers today lack serial ports for communication; this affects PDA, digital camera, and GPS type equipment that may be used on your system. This 16 inch USB serial adapter is great for troubleshooting and allows you to add a serial port and monitor the status of your connections via LED activity flashes. When connection activity is present, the LED’s will flash letting you know you have signal on the pins.

LED Activity Lights for Diagnostics

The GM-FTDI-LED16 offers an advanced an FTDI Chipset supported by Windows 11, USB 2.0 RS-232 connection with double color LED Display of Full Signal Power. The device is powered individually by the USB 2.0 port. This 16 inch device is easily installed, it features a Plug & Play easy test RS-232 Host to Device link and is backwards compatible with USB Spec 1.1.


Package Contents:

  • USB 2.0 RS232 Serial Adapter with LED’s
  • Latest FTDI Driver (available for download)
  • GM-FTDI-LED Product Manual (available for download)


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
  • Easy test RS-232 Host to Device link

OS Support:

  • Windows 7, 8, 10, & Windows 11
  • Linux, Mac OS 10.X

DB-9 Pin Assignment
Pin Data Type Input/Output LED Color
1 IN Data Carrier Detect (DCD) Green
2 IN Receive Data Receive (RXD) None
3 OUT Transmit Data (TXD) Green
4 OUT Data Terminal Ready (DTR) Green
5 GND Ground Wire Red
6 IN Data Set Ready (DSR) None
7 OUT Request Send (RTS) Green
8 IN Clear Send (CTS) None
9 IN Ringing Indicator (RI) None

Additional Features & Specifications:

Device Support:

  • Convenient 16 inch total length for troubleshooting
  • PDA RS-232 Port support 56K Modem support Serial Mouse support+ Serial PC camera support
  • Fully compliant with USB Spec 2.0 Compliant USB Spec1.1
  • RS-232 – DB9 / M Data rate : Over 1000kbps
  • ESD Protection for RS-232 I/O’ +-15KV RS-232 for DTE Mode

We’ve written a blog post on Serial Driver Support including information on Windows Operating System life cycle.

Additional information

Weight 0.131 lbs
Dimensions 8.000 × 6.000 × .75 in




Supported OS

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Cable Length




USB to RS232


1 year from date of purchase.

Tech Note

Download page contains a special note with regard to driver install.

Chip Set

Drivers & Manuals


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