YX 4 Port USB to UART HUB for Raspberry Pi converter Use for Data STK

USB HUB Features

• 1 USB Port input, compatible with USB2.0/1.1, 4 USB Ports ouput with UART TTL 3.3v to COM ports
• Onboard USB to UART, with enable / disable switch, convenient for Raspberry Pi serial debugging and avoiding conflict
• Onboard multi indicators, for monitoring the status of power, USB to UART, and each USB port

Key Features:
● 4 USB to UART Ports: Connect GSM modems, 4G dongles, or sensors and debug via UART simultaneously.
● 3.3V TTL Safe: Directly link to Raspberry Pi, Arduino, or microcontrollers—no risk of overvoltage!
● Onboard Switches & LEDs: Enable/disable UART and monitor power/port status at a glance.
● Compact Design: Fits perfectly with Pi Zero/WH—no bulk, all function.
● Plug & Play: 5V USB-powered—works instantly with Pi, Windows, Linux.

Why Developers Love It:
→ Multi-Task Easily: Run 4 devices + serial debug in one hub.
→ No Conflicts: UART switch avoids serial port clashes.
→ Broad Compatibility: Works with 4G LTE modems, GSM dongles, and data STK tools.

Perfect For:
● Raspberry Pi IoT/automation projects
● GSM/4G modem testing & bulk SMS setups
● Serial communication debugging
● Robotics & microcontroller prototyping

Tech Specs:
Ports: 1x USB input, 4x USB/UART output (3.3V TTL)
Power: 5V USB-powered
Compatibility: Pi Zero/WH, Win/Linux, EC25/EC200A modems

Simplify Your Setup. Maximize Productivity.
Zero Drivers Needed | LED Status Monitoring | 1-Year Warranty

Need a Pi hub that does it all?
Ideal for makers, developers, and telecom tinkerers.

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YxInternet is a professional supplier specializing in consumer electronics, smart devices, and lifestyle products. With years of experience in global trade and a strong supply chain network, we provide businesses and end-users with reliable products at factory-direct prices.

Our mission is to bridge quality manufacturing with global buyers, making cross-border sourcing easier, faster, and more transparent. From product selection to quality control, and from fast delivery to after-sales support, YxInternet ensures every order meets high expectations.

        

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• Extensive Product Range：From smart electronics to innovative gadgets, we cover a wide range of categories to meet various market demands.
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FAQ

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YxInternet is a trusted supplier offering consumer electronics, smart devices, connecting global buyers directly with high-quality factories.

2.How can we guarantee quality?

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3.What can you buy from us?

We offer a wide range of products, including:

SMS Modem

SMS Dongle

Voip gateway

SMS gateway
eSIM Gateway
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1、Overview
(Universal Asynchronous Receiver/Transmitter)， It is called "UART" and is a part of computer hardware. It converts the data to be transmitted between serial communication and parallel communication. As a chip that converts parallel input signals into serial output signals, UART is usually integrated into the connections of other communication interfaces.

HUB also means "center". The main function of a hub is to expand physical ports and regenerate, shape, and amplify received signals to increase the transmission distance of the network, while concentrating all nodes on the nodes centered around it.



2、Product Brief

This is a 4 port USB hub for Raspberry Pi, provides more USB capability to your Pi, what's more, it features USB to UART converter for easy serial communication.

It can work with various versions of the Pi, and the size of the board is designed to perfectly fit the Zero / Zero W / Zero WH.

The product adopts 5V input power supply, compatible with USB power supply, and has an output TTL level of 3.3V. It can be directly connected to various GSM 4G LTE MODEMs, DONGLE, and microcontrollers.

3、Appearance  

● 4 UART HUB
● 1* USB Cable
● 1* AC 100-240V to DC 5V2A adapter
● 1* USB Converter to DC cable

4、USB HUB Features
● 1 USB Port input, compatible with USB2.0/1.1, 4 USB Ports ouput with UART TTL 3.3v to COM ports
● Onboard USB to UART, with enable / disable switch, convenient for Raspberry Pi serial debugging and avoiding conflict

▼Diagram for use with SMS dongle：


▼ Display diagram of the connection port with the computer: