2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable

2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable - Image 2

2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable - Image 3

2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable - Image 4

2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable - Image 5

2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable - Image 6

2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable - Image 7

2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable - Image 8

2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable - Image 9

2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable - Image 10

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2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable

Name: 2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable
Brand: CoolGear
SKU: USBG-232FT-1
Availability: In stock
Rating: 5.00 (2 reviews)

Rated 5 out of 5 based on 2 customer ratings

(2 customer reviews)

Model No. USBG-232FT-1

RS-232 | 128 Bytes Receive | 384 Bytes Transmit | FTDI

Expand Your Serial Capabilities: Connect 2 legacy 9-pin serial devices through a USB-A port to add legacy functionality to newer technologies with no serial port connections.
Safe Connections: Designed with a unique system load reduction feature, the Mini USB to Serial Adapter also offers 15kV surge protection for connected devices.
Plug-&-Play: The adapter’s power is drawn from a USB connection for ease of access and is compatible with Windows (up to Win 11), Mac OS, and Linux.
Small Footprint Design: Use the small Serial Adapter on its own for portability or use the detachable 3 ft. cable for extended connections.
COM Retention: COM Ports are fully configurable, and after reboots, port assignments are preserved.
Upstream: 1 USB port, Type A Male Connector
Downstream: 2 Male DB9, w/ nuts
LEDs: Power, TX / RX

$52.99

Model No. USBG-232FT-1

In stock

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Product Documentation

Software & Drivers

FTDI Driver

Quick Links:

Description

Introduction

Easily expand your serial communication capabilities with Coolgear’s 2-Port USB 2.0 to RS-232 DB-9 Serial Adapter. Designed for convenience and portability, this adapter adds two RS-232 serial ports to your system, perfect for integrating legacy serial devices into modern USB environments. Featuring 15kV ESD surge protection, it ensures reliable performance in both industrial and office applications. Its plug-and-play setup makes it quick and easy to install, making it an excellent choice for demanding settings requiring fast and stable data transfer.

Plugging the USB Dual Serial Adapter to the USB port, the adapter is automatically detected and installed. There are no IRQ & COM port conflicts, since the ports do not require any additional IRQ, DMA, memory as resources on the system. The USB Dual Port RS-232 Serial Adapter is self-powered.

This USB to Dual RS-232 Serial Adapter provides instant connectivity with modems, ISDN TAs, PDS, handheld & pocket PCs, digital cameras, POS, serial printers, etc. It is suitable for remote access, retail and industrial applications, data collection and other applications requiring a High speed and/or LOW speed serial communications port.

Key Features and Benefits

Dual RS-232 Serial Ports: Instantly adds two RS-232 communication ports by connecting to a USB 2.0 port, expanding your system’s functionality.
High-Speed Data Transfer: Supports a baud rate of up to 921.6K bps for high-speed and reliable serial communication.
15kV ESD Surge Protection: Safeguards your connected devices with built-in protection against electrostatic discharge, ensuring durability and stability.
Plug-and-Play Convenience: Automatically detected upon connection with no need for additional drivers, simplifying installation and reducing setup time.
USB Powered: Powered directly from the USB port, eliminating the need for external power adapters.
LED Indicators: Monitor data transmission with built-in LED indicators for TxD and RxD, making troubleshooting and diagnostics straightforward.
Wide Compatibility: Works seamlessly with Windows, Linux, and Mac OS for versatile use across different platforms and devices.

Quick Specs

Adds two RS-232 serial ports by connecting to a USB port
Plugin converter connecting to a USB port conveniently
Installed as standard Windows COM port
Full RS-232 modem control signals and hardware/software flow control
RS-232 data signals: TxD, RxD, RTS, CTS, DSR, DTR, DCD, RI, GND
High speed serial port with the baud rate up to 921.6K bps
Non-standard baud rates supported
LED status indicators for TxD and RxD for easy port monitoring and diagnostic
Serial port protected with surge protection of 15KV
Powered by USB port, no external power adapter required
Easy plug and play installation and RS-232 device connection
COM port number assigned can be changed to any COM port number required
Works with USB 1.1 & 2.0 host port

OS Support:

Windows 98, Me, XP, 2000, 2003, CE, Vista, Windows 7, 8, 10, Windows 11
Linux and Mac OS 10.X

Package Contents

MINI USB to 2-port RS232 serial adapter
3ft. USB Extension Cable
CD-ROM disc with drivers
User’s Manual

Use Cases

Use Cases:

Industrial Automation

Serial Device Integration: Connect and manage industrial equipment such as PLCs, sensors, and controllers through RS-232 ports.
Data Logging: Transfer data from monitoring devices to a central system for analysis and reporting.

Retail and Point-of-Sale Systems

POS Terminals: Connect older serial-based POS systems to modern USB-based computers.
Receipt Printers: Interface legacy serial printers with updated systems for seamless operation.

Remote Access & Field Applications

Handheld Devices: Connect handheld and pocket PCs for remote data collection.
Field Monitoring: Use in environments where reliable, high-speed serial communication is critical for remote device management.

Specifications

Product Specifications

Power

External Power Required

N – External Power Required

Compliance

Country of Origin	Taiwan
Certifications	TAA, CE, FCC, REACH, RoHS

Physical Characteristics

Color	Blue
Item Dimensions (L × W × H)	3.2 × 1.68 × 0.94 in.
Item Weight (Oz.)	0.094 lbs.
Ports	2 Serial Ports
Material of Construction	Plastic
Screw Lock Compatible	Yes

Serial Attributes

RS Signals	CTS, DCD, DSR, DTR, GND, RI, RTS, RXD+, TXD+
Serial Standards	RS232
Serial Baud Rate Maximum	921.6 Kbps
FIFO Receive	128 bytes
FIFO Transmit	384 bytes
Data Bits	7, 8
Serial Parity	None, Even, Odd, Mark, Space
Stop Bits	1, 2
Flow Control	Hardware (RTS, CTS), XON/XOFF
Serial Port qty	2

Software

OS Support / Compatibility

Mac OS, Windows 10, Windows 11, Windows 7, Windows 8, Windows Vista, Windows XP, Linux

Environmental

Operating Temperature Range	0C ~ 55C
Storage Temperature	-20C ~ 75C
Humidity	5% to 95% RH

Product Information

Warranty

One Year

Hardware

Chipset	FTDI
LED Indicators	Power, TX / RX
Upstream Port Types	1 Type-A Male USB

Performance & Safety

ESD Protection

15kV

Other Data

UPC	729440691042
Connector	DB9 Male w/ Nuts
UPC	729440691042
USB Specification	USB 2.0 (480Mbps)
Weight	0.3500 lbs
Dimensions	5.2500 × 5.3100 × 1.1200 in

UPC: 729440691042

Pin-Outs

DB9 RS-232 Pin-Outs

Optional Accessories

Accessories & Replacement Parts

Serial Cable RS232 DB9 Male to Female 5ft

RS232 Male to Female Serial Data Cable Complete your serial data connection with this 5ft. RS232 DB-9 Male to Female data cable for fast reliable…

Model# 9DBMF5FT

$2.99

In stock

Add to cart

Support

Product Documentation & Drivers

Product Documentation

Software & Drivers

FTDI Driver

Need drawings, CAD files, or other compliance documentation? Click HERE

Serial F.A.Q.

Product F.A.Q.

View frequently asked product questions below. For all serial troubleshooting, visit this page.
Still need help? Reach out!

Do these adapters require an external power supply?
Most of our single and dual-port models are USB bus-powered. High-density rackmount models (8-port+) feature integrated or external power supplies for maximum signal integrity.
What is the difference between an isolated and non-isolated serial adapter?
Isolated adapters use optical barriers to physically separate the electrical signals. This protects your computer from 2,500V surges and ground loops common in factory environments.
Can I use these adapters with Windows 11?
Yes, all Coolgear Serial adapters use modern FTDI or Silabs chipsets with WHQL-certified drivers for full Windows 11, Mac, and Linux support.
What is COM Port Retention and why do I need it?
COM Port Retention ensures that your assigned COM port number remains the same every time you plug in the adapter or reboot your PC. This prevents software communication errors and eliminates the need to manually reconfigure your application settings whenever hardware is moved.
How do I clean and reinstall my FTDI drivers?
View Answer
1. Download the CDM Uninstaller HERE.
  
  Extract the zip file, or open the “CDMuninstallerGUI.exe” utility.
  
  Leave the ‘Vendor ID’ set to 0403 and ‘Product ID’ set to 6001.
  
  Click Add.
  
  Click Remove Devices.
  
  Download the corresponding driver for your operating system and follow on-screen prompts. Windows Driver | MacOS Driver
Video tutorial here.
How can I change my device’s COM port?
View Answer
1. Click on Start and navigate to the Control Panel
  
  Locate and click on Device Manager
  
  Under “Ports (COM & LPT)” you will find your serial device titled “USB Serial Port” along with its current COM Port.
  
  Right click on “USB Serial Port” and click on Properties.
  
  Navigate to the “Port Settings” tab and click on “Advanced…”
  
  Once there, the “COM Port Number:” can be changed with a dropdown menu to select the port number.
  
  Click your desired port number (i.e. COM2) and click “OK”.
  
  Click “OK” once more.
  
  Your serial device is now assigned to your chosen COM Port.
How do I check to ensure the COM port is listed properly in Windows?
View Answer
To ensure your serial device is installed properly, complete the following:
1. Press Windows Key + R to open the Device Manager. Once Run comes up, type “devmgmt.msc” into the text field and press Enter.
2. Expand the section labeled, Ports (COM & LPT).
3. You should now see a COM number in brackets to the right of each port. If the device is installed properly, no exclamation points or question marks should be present next to the device.
I have everything hooked up, but nothing is functioning correctly.
View Answer
To rule out potential issues, quickly test your individual components to ensure that they are working correctly individually, and are not the source of the problem:
- Serial cables
- Serial ports
- Serial devices
Test your components by:
- Hook up the serial cable(s), serial port(s), and serial device(s) in a different setup to see if the issue stems from a particular component, or the setup as a whole.
- Replace the serial cable, port, or device within your setup to further troubleshoot the issue’s origin.
When testing cables:
- Test each cable individually.
- Use short cables when you are testing.
When testing serial ports and devices:
- Press the Windows key + R, in Run, type devmgmt.msc, and press Enter to open the Device Manager. You can then check to see if your device is listed under Ports (COM & LPT).
- Ensure that the COM port number is the correct number for the serial device and that the software being used to connect the computer to the serial device uses the correct COM port number.
- If the device is listed with an error, follow the instructions on the website to reinstall the drivers.
Serial communication is not functioning correctly, how can I tell if the problem caused by the adapter or my serial software application?

View Answer
Older serial communication applications make use of legacy hardware addresses, often incompatible with PCI, PCIe, and USB to Serial products. Contact the software provider to troubleshoot.
I am receiving an error when I try to install the drivers in Windows 8 64 bit.
View Answer
Driver Signature Enforcement in Windows 8 may need to be disabled in order to use various drivers. After disabling this feature, the driver will be allowed to install.

Note: You are required to restart your computer after disabling the Driver Signature Enforcement. Save all open work on your computer.

Disable driver signature enforcement:
1. Press the Windows key + C.
2. Click Settings > Change PC Settings.
3. In the left pane, click General.
4. In the right pane, under Advanced startup, click Restart now.
When your system restarts:
1. Click Troubleshoot > Advanced options > Startup Settings > Restart.
2. Press 7.
When your computer restarts, Driver Signature Enforcement will be disabled and you can install the drivers.

Reviews (2)

2 reviews for 2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable

Rated 5 out of 5

Claude Lussier – June 28, 2015

Was easy to install and works well – Like your follow up and your customer care
Rated 5 out of 5

Kirk005 – October 30, 2013

I needed to access serial devices (for control system design) and this unit works great! always connects and at good speeds. Highly recommended.

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2-Port USB 2.0 to RS-232 DB-9 Serial Adapter w/ 15kV Surge Protection & 3 ft. USB Extension Cable

RS-232 | 128 Bytes Receive | 384 Bytes Transmit | FTDI

Product Documentation

Software & Drivers

Quick Links:

Description

Introduction

Key Features and Benefits

Quick Specs

Use Cases

Use Cases:

Industrial Automation

Retail and Point-of-Sale Systems

Remote Access & Field Applications

Specifications

Product Specifications

Pin-Outs

DB9 RS-232 Pin-Outs

Optional Accessories

Accessories & Replacement Parts

Support

Product Documentation & Drivers

Product Documentation

Software & Drivers

Need drawings, CAD files, or other compliance documentation? Click HERE

Serial F.A.Q.

Product F.A.Q.

Reviews (2)