---
product_id: 43084118
title: "TECHTOO 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: "฿3666"
currency: THB
in_stock: true
reviews_count: 11
category: "Techtoo"
url: https://www.desertcart.co.th/products/43084118-techtoo-4-port-professional-ftdi-chip-usb-to-serial-rs232
store_origin: TH
region: Thailand
---

# Up to 1Mbps high-speed data transfer Plug & Play with COM port retention across reboots 4 RS232 ports for multi-device connectivity TECHTOO 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:** ฿3666
**Availability:** ✅ In Stock

## Summary

> 🔗 Unlock serial connectivity like a pro—4 ports, zero compromises.

## Quick Answers

- **What is this?** TECHTOO 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?** ฿3666 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/43084118-techtoo-4-port-professional-ftdi-chip-usb-to-serial-rs232)

## 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.
- • **Reliable FTDI Chipset:** Industry-trusted chipset ensures stable, high-speed data flow without the hassle of external power adapters.
- • **Plug & Play Simplicity:** One-time driver install and you’re ready to roll—perfect for busy pros who demand efficiency.
- • **Seamless Compatibility:** Effortlessly integrates with Windows, macOS, Linux, and Android—future-proof your tech setup.
- • **Persistent COM Port Mapping:** Never lose track of your device connections—COM ports stay assigned even after rebooting for uninterrupted workflow.

## Overview

The TECHTOO 4-Port USB to RS232 DB9 Serial Adapter is a high-speed, plug-and-play converter powered by an FTDI chipset, enabling simultaneous connection of up to four 9-pin serial devices via a single USB port. Compatible across major operating systems including Windows, macOS, and Linux, it maintains COM port assignments after reboot, ensuring reliable and efficient serial communication for professional and industrial applications.

## 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: Functional and Straightforward - Works great. Prolific Driver disk provided helped to ease our setup. USB ports not labeled but can be identified using simple feedback/loopback connector. Would buy again.
Review: Windows 10 No Installation Required - Tech Support not rated as it was not needed. Arrived on time and was an easy plug and play install

## 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 | #319 in Serial Adapters #18,249 in Computer Cables & Interconnects |
| Brand | TECHTOO |
| Brand Name | TECHTOO |
| Cable Type | Type-A |
| Color | 4 RS232 Port |
| Compatible Amazon Tablet Models | Amazon Fire 5th Generation, Amazon Fire 7 5th Generation, Amazon Fire HD 10 5th Generation, Amazon Fire HD 6 4th Generation, Amazon Fire HD 7 4th Generation, Amazon Fire HD 8 5th Generation, Amazon Fire HD 8 6th Generation, Amazon Fire HDX 8.9 4th Generation, Amazon Kindle Fire 1st Generation, Amazon Kindle Fire 2nd Generation, Amazon Kindle Fire HD 2nd Generation, Amazon Kindle Fire HD 3rd Genera… |
| 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 | 4.3 out of 5 stars 35 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 |
| Part Number | STKC-USB2-RS232-4PSCREW |
| 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

![TECHTOO 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/81JwEZGkD4L.jpg)
![TECHTOO 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/81p0-f5FWpL.jpg)
![TECHTOO 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/61JcAC7lYCL.jpg)
![TECHTOO 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)
![TECHTOO 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/718OyHY4jBL.jpg)

## Available Options

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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Functional and Straightforward
*by T***R on December 10, 2020*

Works great. Prolific Driver disk provided helped to ease our setup. USB ports not labeled but can be identified using simple feedback/loopback connector. Would buy again.

### ⭐⭐⭐⭐⭐ Windows 10 No Installation Required
*by K***R on June 26, 2019*

Tech Support not rated as it was not needed. Arrived on time and was an easy plug and play install

### ⭐⭐⭐⭐ Here's detailed (Linux) driver/device info
*by J***T on February 2, 2018*

When buying "generic" computer hardware like this I often wish someone would post some technical details so that I can make a better guess regarding whether or not it's going to work for me. I bought one of these for use on a RPi-based test fixture, and so far I have not run into problems. I did not need the driver disc at all -- just worked out of the box on Debian Linux (wheezy & stretch). `lsusb` outputs the following: Bus 003 Device 012: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC Bus 003 Device 011: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC Bus 003 Device 010: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC Bus 003 Device 009: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC Bus 003 Device 008: ID 1a40:0101 Terminus Technology Inc. Hub That is, it appears as a hub with with 4 FT232 converts connected. Here's the detailed output (lsusb -v -d 0403:6001): Bus 003 Device 012: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x0403 Future Technology Devices International, Ltd idProduct 0x6001 FT232 USB-Serial (UART) IC bcdDevice 6.00 iManufacturer 1 FTDI iProduct 2 FT232R USB UART iSerial 3 AH05KCY0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 32 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xa0 (Bus Powered) Remote Wakeup MaxPower 90mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 255 Vendor Specific Subclass bInterfaceProtocol 255 Vendor Specific Protocol iInterface 2 FT232R USB UART Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 2 Transfer Type Bulk Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 0 Device Status: 0x0000 (Bus Powered) When the device is connected, the following output appeared in /var/log/messages: kernel: [1328570.600195] usb 3-2: new high-speed USB device number 8 using xhci_hcd kernel: [1328570.740504] usb 3-2: New USB device found, idVendor=1a40, idProduct=0101 kernel: [1328570.740513] usb 3-2: New USB device strings: Mfr=0, Product=1, SerialNumber=0 kernel: [1328570.740518] usb 3-2: Product: USB 2.0 Hub [MTT] kernel: [1328570.741191] hub 3-2:1.0: USB hub found kernel: [1328570.741226] hub 3-2:1.0: 4 ports detected kernel: [1328571.048076] usb 3-2.1: new full-speed USB device number 9 using xhci_hcd kernel: [1328571.154958] usb 3-2.1: New USB device found, idVendor=0403, idProduct=6001 kernel: [1328571.154967] usb 3-2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 kernel: [1328571.154972] usb 3-2.1: Product: FT232R USB UART kernel: [1328571.154976] usb 3-2.1: Manufacturer: FTDI kernel: [1328571.154979] usb 3-2.1: SerialNumber: AH05KEIJ kernel: [1328571.158204] ftdi_sio 3-2.1:1.0: FTDI USB Serial Device converter detected kernel: [1328571.158292] usb 3-2.1: Detected FT232RL kernel: [1328571.158742] usb 3-2.1: FTDI USB Serial Device converter now attached to ttyUSB0 kernel: [1328571.256087] usb 3-2.2: new full-speed USB device number 10 using xhci_hcd kernel: [1328571.362674] usb 3-2.2: New USB device found, idVendor=0403, idProduct=6001 kernel: [1328571.362684] usb 3-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 kernel: [1328571.362688] usb 3-2.2: Product: FT232R USB UART kernel: [1328571.362692] usb 3-2.2: Manufacturer: FTDI kernel: [1328571.362696] usb 3-2.2: SerialNumber: A5062OYN kernel: [1328571.366032] ftdi_sio 3-2.2:1.0: FTDI USB Serial Device converter detected kernel: [1328571.366124] usb 3-2.2: Detected FT232RL kernel: [1328571.366558] usb 3-2.2: FTDI USB Serial Device converter now attached to ttyUSB1 kernel: [1328571.468091] usb 3-2.3: new full-speed USB device number 11 using xhci_hcd kernel: [1328571.594043] usb 3-2.3: New USB device found, idVendor=0403, idProduct=6001 kernel: [1328571.594046] usb 3-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 kernel: [1328571.594047] usb 3-2.3: Product: FT232R USB UART kernel: [1328571.594048] usb 3-2.3: Manufacturer: FTDI kernel: [1328571.594048] usb 3-2.3: SerialNumber: AH05KDAK kernel: [1328571.596873] ftdi_sio 3-2.3:1.0: FTDI USB Serial Device converter detected kernel: [1328571.596890] usb 3-2.3: Detected FT232RL kernel: [1328571.597085] usb 3-2.3: FTDI USB Serial Device converter now attached to ttyUSB2 kernel: [1328571.696086] usb 3-2.4: new full-speed USB device number 12 using xhci_hcd kernel: [1328571.803239] usb 3-2.4: New USB device found, idVendor=0403, idProduct=6001 kernel: [1328571.803249] usb 3-2.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 kernel: [1328571.803254] usb 3-2.4: Product: FT232R USB UART kernel: [1328571.803258] usb 3-2.4: Manufacturer: FTDI kernel: [1328571.803261] usb 3-2.4: SerialNumber: AH05KCY0 kernel: [1328571.806660] ftdi_sio 3-2.4:1.0: FTDI USB Serial Device converter detected kernel: [1328571.806745] usb 3-2.4: Detected FT232RL kernel: [1328571.807221] usb 3-2.4: FTDI USB Serial Device converter now attached to ttyUSB3

## 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 Thailand*
*Store origin: TH*
*Last updated: 2026-06-02*