Why does the product photo have a jumper across txd and rxd?

The jumper between TX and RX is mainly used for testing. Short TX, RX means you will receive any data you send. When you program or debug, you can quickly confirm if the TTL adapter is damaged. It saves you time and quickly locates faults.

What is the maximum baud rate of this device?

Build-in FTDI FT232RL Chip, max speed is to 3Mb/s . After testing, we found that data can be transmitted stably below 115200 baud rate.

Does this work with the arduino ide to upload sketches to the arduino pro mini?

yes ,it work with arduino ide to upload sketches to pro mini.

I want to confirm, 5v from the usb side is output to vcc as 5v or converted to 3.3v /1.8v by jumper and sets ttl interface level correct?

Hi, I just checked this on mine with a DMM to verify. Your assumption is correct: the jumper will alter the VCC to 5/3.3/1.8V.

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Description

🔌 Debug Like a Pro, Protect Like a Boss!

CRYSTAL CLEAR PROTECTION - Transparent casing shields against static and shorts while letting you visually monitor LED indicators in real-time.
ROBUST FTDI FT 232 RL CORE - Powered by the original FTDI chip ensuring reliable, high-speed 3Mbps data transfer for flawless debugging.
TRUSTED SUPPORT WARRANTY - Backed by a 12-month warranty and responsive 24-hour customer service to keep your projects on track.
CROSS PLATFORM COMPATIBILITY - Effortlessly integrates with Windows, Linux, and Mac OS for versatile development environments.
UNIVERSAL VOLTAGE FLEXIBILITY - Seamlessly toggle between 1.8V, 3.3V, and 5V logic levels to match any project requirement.

The DSD TECH SH-U09C2 USB to TTL Adapter features the original FTDI FT232RL chip with switchable 1.8V, 3.3V, and 5V logic levels, housed in a transparent protective case to prevent static and shorts. Supporting up to 3Mbps data transfer, it’s compatible across Windows, Linux, and Mac OS platforms. Ideal for programmers and hardware engineers, it comes with a 1-year warranty and responsive support, making it a must-have tool for seamless debugging and programming.

Specifications

ASIN	B07TXVRQ7V
Best Sellers Rank	#11,530 in Computers ( See Top 100 in Computers ) #24 in Serial Adapters
Brand	DSD TECH
Color	Multicoloured
Compatible Devices	Hard Drive, Laptop
Connector Type	USB
Country of Origin	China
Current Rating	1 Amps
Customer Reviews	4.8 4.8 out of 5 stars (853)
Finish	Plastic
Input Voltage	5 Volts
Item Dimensions	38 x 10 x 4 millimeters
Item Weight	0.2 Ounces
Manufacturer	DSD TECH
Model Number	SH-U09C2
Number of Items	1
Number of Ports	1
Package Quantity	1
Power Plug Type	No Plug
Specific Uses For Product	Programming, Debugging, EEPROM, Router, ESP8266 Module, GPS Modules, Firmware on Hard Drive, Transmitter, Set Top Box
UPC	734678383287
Unit Count	1 Count
Warranty Description	1-year warranty
Warranty Type	Limited

Reviews

S**R

Very good product

Good build quality...and excellent in working....

17.12.2025

D**N

Super - GOOD!

It's with real FT232, working tested on Win 10/64bit. Fantastic, as you can choose the voltage 1V8-3V3-5V by choosing onboard jumper position. One year ago I had to telnet into one Dahua IP camera and it was quite difficult to find at the moment one USB to Serial TTL (3V3) interface. Very nice built, in transparent case so you can see onboard LEDs (Power/Tx/Rx) and quickly troubleshoot communication issues. The converter came in nice carton box, with instructions (multi-language) and connection cable female-female (Dupont?) for serial signals (6 wires). PCB is perfect (also other FT232RL signals available, if you need: RESET# , DCD#, DSR#, RI#, DTR# and CBUS0..4). Perfect tool for program / debug. Recommended to use one USB extension cable, to not insert the converter directly in USB port of laptop/PC. Extremely Recommended!

19.01.2021

S**J

very good ttl to usb converter

Very nice product in plastic encasing. Works fine for flashing the ESP8266s..

22.03.2021

R**N

Works like a charm.

12.10.2025

A**R

This device worked first time! Very happy I have tried a couple of the FTDI devices from ebay, however I believe they use dodgy FTDI chips which when used with the genuine drivers, they are bricked. This however comes boxed, includes instructions and some female>female dupont cables. Geninue FTDI drivers worked perfectly. If your looking for a usb > serial converter for Arduino projects / Tasmota, this device works a treat. Wish I had have found it first, it would have saved a couple of hours.

5.03.2021

J**0

Utilisé pour « flasher » un lecteur Gotek. Fonctionne parfaitement. Le câble fourni est très utile pour les connexions. Je conseille pour sa facilité d’utilisation. La qualité de fabrication est très bonne.

12.02.2024

A**L

Funciona bien, lo esperado, los drivers se instalan automáticamente en Windows.

25.04.2025

A**M

Works as advertised

13.12.2025

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DSD TECH SH-U09C2 USB to TTL Adapter Built-in FTDI FT232RL IC for Debugging and Programming

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Description

Specifications

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Common Questions