---
product_id: 43084118
title: "4 Port Professional FTDI CHIP USB to Serial RS232 DB9 Adapter Converter Serial Cable 9-Pin Male to Male with Thumbscrews (W/Thumbscrews, 4 RS232 Port)"
brand: "techtoo"
price: "$74.30"
currency: USD
in_stock: true
reviews_count: 8
category: "Techtoo"
url: https://www.desertcart.us/products/43084118-4-port-professional-ftdi-chip-usb-to-serial-rs232-db9
store_origin: US
region: United States of America
---

# Up to 1Mbps high-speed data transfer Plug & Play with COM port retention across reboots 4 RS232 ports for multi-device connectivity 4 Port Professional FTDI CHIP USB to Serial RS232 DB9 Adapter Converter Serial Cable 9-Pin Male to Male with Thumbscrews (W/Thumbscrews, 4 RS232 Port)

**Brand:** techtoo
**Price:** $74.30
**Availability:** ✅ In Stock

## Summary

> 🔗 Unlock serial connectivity like a pro—4 ports, zero hassle, infinite possibilities.

## Quick Answers

- **What is this?** 4 Port Professional FTDI CHIP USB to Serial RS232 DB9 Adapter Converter Serial Cable 9-Pin Male to Male with Thumbscrews (W/Thumbscrews, 4 RS232 Port) by techtoo
- **How much does it cost?** $74.30 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/43084118-4-port-professional-ftdi-chip-usb-to-serial-rs232-db9)

## Best For

- techtoo enthusiasts

## Why This Product

- Trusted techtoo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Quad-Port Powerhouse:** Connect and control 4 serial devices simultaneously from a single USB port—maximize your multitasking mojo.
- • **Pro-Grade FTDI Chipset:** Industry-trusted chipset ensures rock-solid performance and broad driver support for mission-critical tasks.
- • **Seamless Compatibility:** Effortlessly integrates with Windows, macOS, Linux, and Android—your cross-platform command center.
- • **USB-Powered Convenience:** No bulky adapters needed—powered directly via USB for a clean, clutter-free setup.
- • **Reliable COM Port Persistence:** Never lose track—COM port assignments stay consistent even after reboot, perfect for professional workflows.

## Overview

The TECHTOO 4-Port USB to RS232 DB9 Serial Adapter is a high-speed, USB-powered converter cable designed for professionals needing reliable multi-device serial connections. Featuring a trusted FTDI chipset, it supports up to 1Mbps data transfer and maintains COM port assignments across reboots. Compatible with Windows, macOS, Linux, and Android, it enables seamless integration of modems, GPS units, scanners, and industrial devices into modern computing environments without external power adapters.

## Description

TECHTOO, known as a worldwide registered brand in North America, Europe and Asia. Description TECHTOO USB to RS232 DB9 Serial MALE Converter Adapter Cable is designed to connect serial devices such as PCs with RS-232 ports, Bluetooth serial adapters, PDAs, GPS receivers, routers, firewalls, modems, printers, cash registers, embedded character displays, scan tools, sonar units, embedded boards, etc. Specific devices include: Garmin eTrex GPS, Seiko Label Printer, Create, Cisco products with serial consoles, US Robotics Modems, NexStar telescopes, Equus Scan Tools, Uniden Hand Held Scanners, etc. Works with software like: HyperTerminal, TeraTerm, WinDBG, all open source serial software on Linux, etc. or ISDN Terminal Adapters through USB port with over 1Mbps data transfer rate. The USB RS232A converter features a Prolific chipset for the best combination of performance and wide driver support.and Microsoft signed drivers for 32/64-bit is easy to install and offers broad operating system compatibility, including Windows 8, Linux and Mac OS, for easy integration into mixed environments. Specification 1. Connectors: USB 2.0 Type A Male to RS232 DB9 MALE 2. Connect a RS-232 serial device such as a modem to a USB port on your computer 3. Supports Windows8.1/8/7/Vista/XP//2000/Andorid/Linux and Mac OS X 10.6 and above 4. Uses latest FTDI chipset 5. Plug & Play after one time driver installation 6. Maximum Transfer rate: up to 1Mbps 7. Supports Automatic Handshake 8. Powered by USB port, no external power adapter required Package Contents TECHTOO USB to DB9 Serial Adapter 3ft/1m x 1 FTDI Chip

Review: Works well - Didn't brick my pi. Works well with Solar Assistant and the EG4 3k inverters. I upgraded to 6k units but I still use the 3k units so I'm still using this cable. I tried using a noname single cable and my pi fried. These are pricey but worth the money
Review: Works great for tech multitasking using Win 10 and 7. Also Linux - Purchased for my tech department employees to use with laptops. Works perfectly on Windows 10 and 7 also seems to work fine with CentOS and Redhat Linux. We work on a lot of EMC, NetApp, Cisco...equipment testing using serial ports and this is great and easy to stick in a laptop case. They can more easily multitask by running multiple serial connections to multiple systems using Putty or Hyperterminal, etc. I advise you determine what comport each serial connection "head" is assigned in device manager because it gets confusing. We mark each serial head with a number that corresponds to the com port assigned by OS. Once you install the drivers each "head" is assigned a comport that does not change.

## Features

- The TECHTOO High-Speed 4-Port USB-to-DB9-Serial Adapter allows you to connect as many as four 9-pin serial devices to a computer or laptop with a USB Type-A port.
- Configuring and sharing data among multiple modems, GPS devices, cellphones, hand-held scanners, point-of-sale systems, touch screens, medical and scientific instruments, industrial process control devices and UPS systems easily
- USB to SERIAL RS232 DB9 Adapter (4-PORT): Add four RS232 serial ports to any laptop or desktop computer using a single USB port. The USB to Serial Converter is Powered by an Available USB Cable. No External Power Adapter is Required
- COM RETENTION: COM Port assignments maintained across reboot. The USB to serial rs232 adapter plug and play. Compatible for Windows 10 & macOS 10.X / 11.X.
- IMPORTANT Note: The TECHTOO 4 port RS232 USB Serial Adapter does not support devices such as serial mice that require an IRQ number or I/O address.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B06ZXRR5N7 |
| Best Sellers Rank | #307 in Serial Adapters #16,993 in Computer Cables & Interconnects |
| Brand | TECHTOO |
| Brand Name | TECHTOO |
| Cable Type | Type-A |
| Color | 4 RS232 Port |
| Compatible Devices | Camera, GPS Navigation System, Printer |
| Compatible Phone Models | Potentially compatible with smartphones, specific models unknown |
| Connector Gender | Male-to-Male |
| Connector Type | Serial Adapter |
| Customer Reviews | 4.2 out of 5 stars 86 Reviews |
| Frequency | 1000000 Hz |
| Indoor Outdoor Usage | Indoor |
| Item Type Name | USB to Serial Adapter |
| Item Weight | 0.15 Kilograms |
| Manufacturer | TECHTOO |
| Model | 8541684655 |
| Model Name | USB to Serial RS232 Adapter |
| Number of Items | 1 |
| Number of Pins | 9 |
| Other Special Features of the Product | High Speed |
| Recommended Uses For Product | Connecting serial devices such as modems, GPS receivers, routers, printers, etc. to a computer or laptop with a USB port. |
| Special Feature | High Speed |
| Specification Met | USB-IF |
| UPC | 713458103734 |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** TECHTOO
- **Connector Type:** Serial Adapter
- **Cable Type:** Type-A
- **Compatible Devices:** Camera, GPS Navigation System, Printer
- **Special Feature:** High Speed

## Images

![4 Port Professional FTDI CHIP USB to Serial RS232 DB9 Adapter Converter Serial Cable 9-Pin Male to Male with Thumbscrews (W/Thumbscrews, 4 RS232 Port) - Image 1](https://m.media-amazon.com/images/I/61JcAC7lYCL.jpg)
![4 Port Professional FTDI CHIP USB to Serial RS232 DB9 Adapter Converter Serial Cable 9-Pin Male to Male with Thumbscrews (W/Thumbscrews, 4 RS232 Port) - Image 2](https://m.media-amazon.com/images/I/61a99E4nvzL.jpg)
![4 Port Professional FTDI CHIP USB to Serial RS232 DB9 Adapter Converter Serial Cable 9-Pin Male to Male with Thumbscrews (W/Thumbscrews, 4 RS232 Port) - Image 3](https://m.media-amazon.com/images/I/718OyHY4jBL.jpg)
![4 Port Professional FTDI CHIP USB to Serial RS232 DB9 Adapter Converter Serial Cable 9-Pin Male to Male with Thumbscrews (W/Thumbscrews, 4 RS232 Port) - Image 4](https://m.media-amazon.com/images/I/71IxX0Ct8sL.jpg)
![4 Port Professional FTDI CHIP USB to Serial RS232 DB9 Adapter Converter Serial Cable 9-Pin Male to Male with Thumbscrews (W/Thumbscrews, 4 RS232 Port) - Image 5](https://m.media-amazon.com/images/I/71K+c1bf7aL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well
*by C***G on September 7, 2025*

Didn't brick my pi. Works well with Solar Assistant and the EG4 3k inverters. I upgraded to 6k units but I still use the 3k units so I'm still using this cable. I tried using a noname single cable and my pi fried. These are pricey but worth the money

### ⭐⭐⭐⭐⭐ Works great for tech multitasking using Win 10 and 7. Also Linux
*by K***R on November 15, 2016*

Purchased for my tech department employees to use with laptops. Works perfectly on Windows 10 and 7 also seems to work fine with CentOS and Redhat Linux. We work on a lot of EMC, NetApp, Cisco...equipment testing using serial ports and this is great and easy to stick in a laptop case. They can more easily multitask by running multiple serial connections to multiple systems using Putty or Hyperterminal, etc. I advise you determine what comport each serial connection "head" is assigned in device manager because it gets confusing. We mark each serial head with a number that corresponds to the com port assigned by OS. Once you install the drivers each "head" is assigned a comport that does not change.

### ⭐ Not worth the money
*by M***R on November 30, 2025*

Used this for a year as serial interface controls for my ham radios. all low-speed data. Ports started randomly dying -not detected at all. waste of money.

## Frequently Bought Together

- TECHTOO 4 Port Professional FTDI CHIP USB to Serial RS232 DB9 Adapter Converter Serial Cable 9-Pin Male to Male with Thumbscrews
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-07*