---
product_id: 207195422
title: "HiLetgo 5pcs TTL to RS485 485 to Serial UART Level Reciprocal Hardware Automatic Flow Control UART to RS485 Converter RS485 to TTL"
brand: "hiletgo"
price: "502748₫"
currency: VND
in_stock: true
reviews_count: 8
category: "Hi Letgo"
url: https://www.desertcart.vn/products/207195422-hiletgo-5pcs-ttl-to-rs485-485-to-serial-uart-level
store_origin: VN
region: Vietnam
---

# 3.3V/5V dual voltage support 1 km long-distance transmission Auto flow control & hot swapping HiLetgo 5pcs TTL to RS485 485 to Serial UART Level Reciprocal Hardware Automatic Flow Control UART to RS485 Converter RS485 to TTL

**Brand:** hiletgo
**Price:** 502748₫
**Availability:** ✅ In Stock

## Summary

> 🔗 Future-Proof Your Serial Communication with Industrial-Strength RS485 Power!

## Quick Answers

- **What is this?** HiLetgo 5pcs TTL to RS485 485 to Serial UART Level Reciprocal Hardware Automatic Flow Control UART to RS485 Converter RS485 to TTL by hiletgo
- **How much does it cost?** 502748₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/207195422-hiletgo-5pcs-ttl-to-rs485-485-to-serial-uart-level)

## Best For

- hiletgo enthusiasts

## Why This Product

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

## Key Features

- • **Plug & Play Hot Swapping:** Swap modules on the fly without signal loss or downtime, maximizing operational efficiency.
- • **Dual Voltage Compatibility:** Works effortlessly with both 3.3V and 5V systems, ensuring versatile integration with modern microcontrollers.
- • **Real-Time Signal Monitoring:** Built-in RXD and TXD indicator LEDs let you visually track data transmission status instantly.
- • **Robust Industrial-Grade Design:** Operates flawlessly from -40°C to +85°C with anti-interference and lightning protection for harsh environments.
- • **Seamless Multi-Device Networking:** Connect up to 128 devices on a single RS485 bus for scalable industrial communication.

## Overview

The HiLetgo 5pcs TTL to RS485 UART converters deliver industrial-grade, long-distance serial communication with support for up to 128 devices on a single bus. Featuring dual 3.3V/5V compatibility, automatic flow control, and hot-swappable modules, these adapters ensure reliable, interference-resistant data transmission up to 1 kilometer. Perfect for professionals demanding scalable, robust networking solutions in harsh environments.

## Description

Description: Absolute using imported chips, industrial design, anti-interference ability, while using more effective mine design can be used in the industrial field and harsh field environments, the working temperature of -40 ℃ to + 85 ℃ transmission distance up to 1 kilometer (made with 850 meters of cable F1.5 tests recommended in the 800 meters, more than 800 m, please add repeaters). The module is fully considered mine design, long-distance transmission signal 485 in the wild, the module "Connected to the ground" terminal is connected to the earth, can play a very good anti-jamming and anti-lightning effect, more secure; it can not connect with the ground when the indoor short-distance transmission. Has a 120 ohm termination resistors, shorted R0to enable the termination resistor. Package included: 5* TTL to RS485 485 to Serial UART Adapter

Review: Worked Perfect! - I used this between a PZEM-017 and an ESP32 to monitor DC current/voltage. Worked as expected, but note that alot of the online references show TX to RX and RX to TX. I found that this RS485 adapter worked only with TX to TX and RX to RX. outside of that worked perfectly. I only wish it had external led pins for TX/RX led connections.
Review: Good product. But connect RX to RX, TX to TX - As a couple of other reviews point out, connect TX of this device to TX of microcontroller, and RX of this device to RX of microcontroller (that is a bit counter-intuitive compared to other devices I used) I like that it is auto-duplexing and can work with VCC of 3.3V or 5V. Soldering is required, and the boards don't come with any headers or terminal blocks. Very inexpensive (at the price I got it for) for a five unit package.

## Features

- TTL to RS485 485 to Serial UART Adapter
- Compatible with 3.3V and 5.0V power supply.
- Has RXD, TXD signal indicator light, monitor send and receive status.
- Support multi-machine communication, allowing access at up to 128 devices on the bus
- The module can be hot swapped, the signal does not appear dead phenomenon.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B082Y19KV9 |
| Best Sellers Rank | #59 in Serial Adapters |
| Brand | HiLetgo |
| Color | blue |
| Compatible Devices | Monitor |
| Connector Type | Lightning |
| Customer Reviews | 4.5 out of 5 stars 53 Reviews |
| Finish | Light |
| Finish Type | Light |
| Input Voltage | 5 Volts |
| Item Weight | 0.02 Kilograms |
| Manufacturer | HiLetgo |
| Model Number | 3-01-1621 |
| Number of Items | 5 |
| Number of Ports | 5 |
| Package Quantity | 1 |
| Power Plug Type | Type G |
| Specific Uses For Product | Monitor |

## Product Details

- **Brand:** HiLetgo
- **Color:** blue
- **Compatible Devices:** Monitor
- **Connector Type:** Lightning
- **Specific Uses For Product:** Monitor

## Images

![HiLetgo 5pcs TTL to RS485 485 to Serial UART Level Reciprocal Hardware Automatic Flow Control UART to RS485 Converter RS485 to TTL - Image 1](https://m.media-amazon.com/images/I/71cwg88RdFL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked Perfect!
*by D***A on June 29, 2024*

I used this between a PZEM-017 and an ESP32 to monitor DC current/voltage. Worked as expected, but note that alot of the online references show TX to RX and RX to TX. I found that this RS485 adapter worked only with TX to TX and RX to RX. outside of that worked perfectly. I only wish it had external led pins for TX/RX led connections.

### ⭐⭐⭐⭐⭐ Good product. But connect RX to RX, TX to TX
*by J***N on July 16, 2025*

As a couple of other reviews point out, connect TX of this device to TX of microcontroller, and RX of this device to RX of microcontroller (that is a bit counter-intuitive compared to other devices I used) I like that it is auto-duplexing and can work with VCC of 3.3V or 5V. Soldering is required, and the boards don't come with any headers or terminal blocks. Very inexpensive (at the price I got it for) for a five unit package.

### ⭐⭐⭐⭐ Reliable RS485 Modules with Auto Flow Control—But Not Breadboard Friendly
*by A***K on July 19, 2025*

These RS485 modules are a major improvement over older models that require manual flow control. The automatic flow control works flawlessly, making them much easier to integrate into a project. As other reviewers have noted, wiring is straightforward: TX on your Arduino (or similar device) connects to TX on the module, and RX to RX. For the RS485 side, B- connects to B-, and A+ to A+. On the receiving unit, TX and RX follow the same mapping. I used the spare pair in an RJ11 twisted pair cable to carry VCC and GND between the modules, which worked perfectly. In the demo video, you can see a yellow LED flashing once per second—this is triggered across the RS485 link. There's also a built-in LED on the ItsyBitsy board flashing every five seconds, controlling a relay at the other end. The TX/RX LEDs on both modules flicker as data is sent and received, confirming everything is working as expected. I’m giving 4 stars instead of 5 because the physical design is awkward for use with solderless breadboards. The modules are so long that you need to place two standard breadboards side by side just to accommodate them once the headers are soldered. A shorter, more compact form factor would have been much more convenient.

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-03-16*