USB-C 2.0 to Serial RS-232 Adapter w/ LED Indicators

(3 customer reviews)


This NEW USB C to Serial RS232 adapter uses the new type-C USB connector technology for easy, reversible connections. The same great tool of choice when supporting serial peripherals in newer computers without serial support with a C port host. Supported by Windows 11, this is an ideal solution for serial device support.


  • Ferrite ring for noise reduction
  • USB Type-C reversible connector
  • Full compliance with USB 2.0/1.1
  • Supports Windows 7, 8, 10, and 11, Linux, OSX

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Model #: GM-FTDI2-LED-C Categories: , , , , , Tags: ,

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This USB serial device is a USB C to RS-232 serial adapter compliant with USB 2.0 specifications, used to easily add a serial port to your computer even if they are unequipped with COM port ability.

The GM-FTDI2-LED-C supports peripherals requiring a serial RS-232 connection through a USB C type host port connection from your Laptop or Desktop computer. The USB C to serial adapter allows you to add a single serial port and monitor the status of your connections by using LED activity flashes.

LED indicators on USB FTDI Serial AdapterWhen connection activity is present, the LED’s will flash letting you know you have signal on the pins. The GM-FTDI2-LED-C offers an advanced an FTDI Chipset supported by Windows 11. The device is powered individually by the USB 2.0 Type-C port and is easy to install with Plug & Play, it easily tests RS-232 Host to Device link with backward compatibility with USB Spec 1.1.

Device Support:

  • Supports reversible USB type-C connection only, can not be connected to any other USB port.
  • 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 Features & Specifications:
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
  • Supports USB C port connection

OS Support:

  • Windows 7, 8, 10, and 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

Package Contents:

  • USB C to RS232 Serial Adapter with LED’s
  • Latest FTDI Driver (available for download)
  • GM-FTDI2-LED Product Manual (available for download)

Additional information

Weight .187 lbs
Dimensions 8.250 × 6.000 × .750 in




Supported OS

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Cable Length




USB C to RS232


1 year from date of purchase.

Tech Note

The USB C connector can only be used in a USB Type-C port, it is not compatible with standard USB ports.

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

Drivers & Manuals

3 reviews for USB-C 2.0 to Serial RS-232 Adapter w/ LED Indicators

  1. AppleIIForEver

    5.0 out of 5 stars

    Very well functioning USB-Serial Converter
    This is a very well functioning USB-RS232 serial converter.After trying (and failing) using a well-reviewed Keyspan converter that I’ve had for several years (with TI chip and Keyspan driver), I tried this Gearmo with the FTDI chip and have had excellent results on an Intel Mac Mini with MacOS 10.14.6 (Mojave) with the stock FTDI driver that comes with MacOS.My application is using a remote serial console communicating with the getty daemon that MacOS also includes. I use RTS/CTS hardware handshaking at 19,200 baud and up, and haven’t experienced any issues.The FTDI chip and the Apple driver appear to respect all the termios serial flags and commands used by the appropriate gettytab file entry (I had to modify my gettytab entry for the settings I used — that takes a little work, but once you understand all the flags it’s not bad).Finally, I like having the LEDs for the various serial lines. The Gearmo is a nice little product at a great price.

  2. Brian Ackley

    5.0 out of 5 stars

    VESDA compatible
    Worked on VESDA with my Dell Laptop

  3. Slagyr

    No installation needed. Plug and play.
    Its a plug and okay. I never had any issues regarding the connection when I manage devices. I used putty and secure crt all works perfect. Easily get detected from my laptop ports.

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