---
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: "₨6108"
currency: LKR
in_stock: true
reviews_count: 8
category: "Hi Letgo"
url: https://www.desertcart.lk/products/207195422-hiletgo-5pcs-ttl-to-rs485-485-to-serial-uart-level
store_origin: LK
region: Sri Lanka
---

# Auto Flow Control for seamless data Up to 1 km transmission distance 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:** ₨6108
**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?** ₨6108 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/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

- • **Multi-Device Support:** Connect up to 128 devices on a single RS485 bus for scalable, complex systems.
- • **Industrial-Grade Durability:** Built to withstand harsh environments from freezing cold to scorching heat.
- • **Long-Distance Communication:** Reliable data transmission up to 1 kilometer—expand your network without limits.
- • **Real-Time Signal Monitoring:** Integrated RXD/TXD LEDs keep you informed of data flow status at a glance.
- • **Plug & Play Auto Flow Control:** Effortless integration with zero manual setup—perfect for pros and novices alike.

## Overview

The HiLetgo 5pcs TTL to RS485 UART converters deliver robust, industrial-strength serial communication with automatic flow control, supporting up to 128 devices and transmission distances up to 1 km. Designed for harsh environments with a wide temperature range and anti-interference features, these modules ensure reliable, plug-and-play connectivity for professional and DIY projects alike.

## 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: My favourite RS485 device - I do a lot of Home Assistant builds and have used many different types of device. These RS485 controllers have auto flow control and are by far the easiest to get working, especially for novices to this protocol.
Review: Reliable RS485 Modules with Auto Flow Control—But Not Breadboard Friendly - 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.

## 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 | #48 in Serial Adapters |
| Customer Reviews | 4.4 4.4 out of 5 stars (51) |
| 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/51+Du5sRIiL.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/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 3](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 4](https://m.media-amazon.com/images/I/71cwg88RdFL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ My favourite RS485 device
*by M***T on November 29, 2024*

I do a lot of Home Assistant builds and have used many different types of device. These RS485 controllers have auto flow control and are by far the easiest to get working, especially for novices to this protocol.

### ⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ 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.

## Frequently Bought Together

- HiLetgo 5pcs TTL to RS485 485 to Serial UART Level Reciprocal Hardware Automatic Flow Control UART to RS485 Converter RS485 to TTL
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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-01-31*