The HX711 Modbus RS485 Module is a high-precision, 24-bit Analog-to-Digital Converter (ADC) designed for industrial weighing applications. Unlike standard hobbyist boards, this module integrates a dedicated MCU to handle the Modbus RTU protocol, allowing for long-distance data transmission and direct interfacing with PLCs, HMIs, and PCs.
🔍 Intelligence on the Edge
This module is more than a raw sensor interface. It includes onboard digital filtering, zero-point tracking, and calibration registers. By offloading these tasks from your main controller, you achieve a more stable signal and faster system response times, even in electrically noisy industrial environments.
🛠️ Technical Specifications
| Feature | Specification |
|---|---|
| Supply Voltage | DC 5V version / DC 8V-16V (12V) version |
| ADC Resolution | 24-bit High-Precision HX711 |
| Communication | RS485 Modbus RTU (Slave Address 1-247) |
| Baud Rate | 9600 bps (Default), N, 8, 1 |
| Sampling Rate | 10Hz or 40Hz |
| Calibration | Onboard Zeroing and Weight Calibration Registers |
🚀 Key Industrial Features
Designed for reliability, the WG18A02 module offers several advanced functions often missing in basic ADC boards:
- Digital Filtering: Built-in median and average filters to stabilize readings in high-vibration areas.
- Zero-Chasing: Automatic maintenance of the zero-load point to compensate for thermal drift.
- Hot-Pluggable: Standard RS485 wiring allows for adding or removing scales from the network without system downtime.
- Long Distance: Reliable communication over distances exceeding 100 meters, far beyond the limits of standard I2C or SPI sensors.
LOGICHOBBYIST PRO-TIP: When wiring your load cell, use a shielded cable and connect the shield to the GND terminal only at the module side. For maximum precision in static weighing, keep the sampling rate at 10Hz. If you are building a high-speed dosing system, switch to 40Hz and implement a moving-average filter in your Python or PLC code to balance speed and stability.