---
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: "¥2968"
currency: JPY
in_stock: true
reviews_count: 8
category: "Hi Letgo"
url: https://www.desertcart.jp/products/207195422-hiletgo-5pcs-ttl-to-rs485-485-to-serial-uart-level
store_origin: JP
region: Japan
---

# Auto Flow Control boosts efficiency Supports up to 128 devices on RS485 bus Wide -40°C to +85°C industrial temp range 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:** ¥2968
**Availability:** ✅ In Stock

## Summary

> 🚀 Elevate your serial communication game with industrial-grade ease!

## 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?** ¥2968 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/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-and-Play Hot Swapping:** Swap modules on the fly without signal loss or downtime—perfect for dynamic setups.
- • **Automatic Flow Control Magic:** Simplify your coding with built-in automatic flow control, saving you time and headaches.
- • **Robust Industrial-Grade Design:** Engineered with imported chips and anti-interference tech to thrive in harsh environments from -40°C to 85°C.
- • **Visual TX/RX Status Indicators:** Stay in control with real-time LED indicators monitoring data transmission and reception.
- • **Seamless Multi-Device Networking:** Connect up to 128 devices effortlessly on a single RS485 bus for scalable industrial communication.

## Overview

The HiLetgo 5pcs TTL to RS485 UART converters deliver industrial-strength, long-distance serial communication with automatic flow control and hot-swappable design. Compatible with 3.3V/5V systems, they support up to 128 devices on a single bus, operate reliably from -40°C to 85°C, and feature LED indicators for real-time data monitoring—ideal for professional-grade IoT and industrial networking projects.

## 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: Easy, Automatic Flow Control makes me happy! - First, I purchased this because it has Automatic Flow Control! WHAT A DREAM! Saves a lot in programming. Although, the programming for this using Arduino Nano's (V3 and ESP32 S3) is a breeze! Awesome board, easy set up and works fantastically. The price, being second, I dont know if you can find Automatic flow control with any boards as inexpensive as this! I use many of them for communication between all my Arduino's and 5 at a time is great!

## 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 | #61 in Serial Adapters |
| Customer Reviews | 4.5 4.5 out of 5 stars (55) |
| Date First Available | December 20, 2019 |
| Item Weight | 0.634 ounces |
| Item model number | 3-01-1621 |
| Manufacturer | HiLetgo |
| Package Dimensions | 4.06 x 2.83 x 0.43 inches |

## 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)
![HiLetgo 5pcs TTL to RS485 485 to Serial UART Level Reciprocal Hardware Automatic Flow Control UART to RS485 Converter RS485 to TTL - Image 2](https://m.media-amazon.com/images/I/61jsYiEs7xL.jpg)
![HiLetgo 5pcs TTL to RS485 485 to Serial UART Level Reciprocal Hardware Automatic Flow Control UART to RS485 Converter RS485 to TTL - Image 3](https://m.media-amazon.com/images/I/61ZMCtLBm9L.jpg)
![HiLetgo 5pcs TTL to RS485 485 to Serial UART Level Reciprocal Hardware Automatic Flow Control UART to RS485 Converter RS485 to TTL - Image 4](https://m.media-amazon.com/images/I/51+Du5sRIiL.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.

### ⭐⭐⭐⭐⭐ Easy, Automatic Flow Control makes me happy!
*by M***E on February 22, 2026*

First, I purchased this because it has Automatic Flow Control! WHAT A DREAM! Saves a lot in programming. Although, the programming for this using Arduino Nano's (V3 and ESP32 S3) is a breeze! Awesome board, easy set up and works fantastically. The price, being second, I dont know if you can find Automatic flow control with any boards as inexpensive as this! I use many of them for communication between all my Arduino's and 5 at a time is great!

### ⭐⭐⭐⭐ 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.

## Frequently Bought Together

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-18*