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

🚀 Elevate your debugging game with the ultimate USB-to-TTL adapter!

BUILT IN SAFETY SHIELD - Transparent protective casing guards against static interference and accidental shorts.
PLUG PLAY POWERHOUSE - Effortless USB 2.0 connectivity ensures blazing-fast 3Mbps data transfer speeds.
TRI VOLTAGE LOGIC MASTERY - Seamlessly switch between 1.8V, 3.3V, and 5V TTL levels for ultimate device compatibility.
CROSS PLATFORM COMPATIBILITY - Flawlessly supports Windows, Mac OS, and Linux—your universal debugging sidekick.
PRO GRADE WARRANTY SUPPORT - Backed by 12 months warranty and responsive 24-hour tech support to keep you coding stress-free.

The DSD TECH SH-U09C2 USB to TTL Adapter features the original FTDI FT232RL chip, supporting versatile 1.8V/3.3V/5V logic levels with jumper selection. Its transparent protective case prevents static and short circuits, while USB 2.0 interface delivers up to 3Mbps speed. Compatible across Windows, Mac, and Linux platforms, it’s ideal for programming, debugging, and flashing firmware on a wide range of UART devices. Comes with a 12-month warranty and dedicated 24-hour support.

Specifications

Brand	DSD TECH
Manufacturer	DSD TECH
Country of Origin	USA
Model number	SH-U09C2
Colour	Transparent
Number of Memory Sticks	1
Special Feature	short circuit protection
Specific Product Use	Programming, Debugging, EEPROM, Router, ESP8266 Module, GPS Modules, Firmware on Hard Drive, Transmitter, Set Top Box
Item Weight	5.66 g
Product Dimensions	3.81 x 1.02 x 0.38 cm; 5.67 g
Item model number	SH-U09C2
Item Height	0.15 Inches
Item Width	0.4 Inches
Auto Focus Included	No
Number of Ports/Connectors	1
Operating System	Linux, Mac OS, Windows 7
Compatible Device	GPS
Are batteries included?	No
Hardware Interface Type	USB 2.0

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