Huaqingjun 32DI 32DO RS485 Ethernet Relay Module IO Modbus RTU/TCP MQTT 10A G2R-1 RJ45 Relays for Greenhouse Automation

Product Description

1. Current supply requirement parameter Working voltage: default voltage: 24V; 12V optional Maximum voltage: 24V18~30V/ 12V10~15V Current requirement: relay output mode 0.2A 4 paths triggered 0.95 A32 paths triggered transistor output mode 0.5A 16 paths triggered pure input mode: 0.3A 32 paths triggered Reverse connection protection: all products applicable 2. Communication circuit parameter Insulation or not: all insulated Insulation voltage: ±1500V Communication protocol：Modbus RTU, Modbus TCP Baud Rate：1200/2400/4800/9600/19200/38400/57600/115200 BPS Data format: 1 start byte 8 data bytes parity checking, 1 or 2 stop bytes Maximum panel points: 32 modules sharing the BUS Transmission distance: ≥800M Double twisted cable Screening terminals: support 3. High Compatibility  Supports the standard MODBUS RTU protocol Supports Siemens, Mitsubishi, Omron, Panasonic, and other PLCs as I/O port expansion and remote control Supports configuration software from major brands such as KingView, MCGS Kunlun Tongtai, EasyBuilder, and ForceCon

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Company Introduction

Packing&Shipping

PACKING
Packaging Details: standard paper box

DELIVERY
Delivery Time: 3-5 days after payment for sample order
                        10-25 days after payment for big order

FAQ

Q1. What advantages do you have

A: We have independent products, good quality products, excellent technical support and service

Q2. How long is the quality guarantee

A: Product quality warranty is one year

Q3. What is the delivery time

A: Normally, it is about 3-5 days after payment. It needs to be negotiated to special requirement orders

Q4. How about the quality of your product

A: Before shipping out, we will check for quality, including check the function of products, the appearance, the packing, the necessary accessories and power adapter plug standard

Q5. How do you keeping our long-term business and good relationship

A:1. We keep good quality and competitive price to ensure our customers benefit ;

2. We respect every customer as our friend and we sincerely do business and make friends with them,  no matter where they come from

3. We could customize modules according to customer's requirements

Qingjun Huaqingjun 32DI 32DO RS485 Ethernet Relay Module is a reliable and flexible control unit designed for greenhouse automation and smart farming applications. Built to meet the needs of growers, hobbyists, and system integrators, this module offers a clear, user-friendly way to monitor and control a wide range of devices such as fans, heaters, irrigation valves, lights, and sensors. With support for RS485 Modbus RTU, Ethernet Modbus TCP, and MQTT protocols, the unit easily connects to PLCs, SCADA systems, IoT platforms, and home automation controllers

Key features include 32 digital inputs and 32 digital outputs, giving ample IO capacity for medium to large greenhouse setups. The digital inputs accept standard signal levels and are suitable for connection to switches, float sensors, thermostats, and other dry-contact or open-collector devices. The 32 relay outputs use robust G2R-1 relays rated at 10A per channel, providing safe switching for AC or DC loads such as pumps, heaters, and lighting circuits. Each relay is isolated to prevent electrical interference between circuits and to help protect sensitive control electronics

Communication options are versatile. The RS485 interface uses Modbus RTU, a standard and widely supported industrial protocol that allows straightforward integration with legacy equipment and data loggers. For modern networks, the Ethernet port supports Modbus TCP and offers high-speed, low-latency communication with supervisory systems. MQTT support enables cloud connectivity and lightweight messaging for IoT applications, allowing greenhouse data to be published to brokers and enabling remote control via mobile apps or web dashboards. With RJ45 connectivity and clear termination, installation is quick and tidy

The module is engineered with practical installation in mind. Compact DIN-rail mounting makes it easy to add to control cabinets and panel setups commonly used in greenhouse environments. Terminals are clearly labeled and secured with screw connectors to ensure lasting connections even in humid conditions. The module housing is durable, protecting internal components from dust and mechanical stress. Thoughtful layout and marking simplify wiring tasks and reduce the chance of errors during installation

Safety and reliability are central to the design. Mechanical relays provide physical isolation, preventing back feed and reducing risk to connected devices. Surge protection and filtering on communication lines help guard against transient spikes caused by storms or power system switching. The unit includes LED indicators for power, communication status, and the state of each input and output, enabling quick troubleshooting and visual confirmation of system operation without needing an external tool

Configuration and management are straightforward. Out-of-the-box, the module supports common Modbus addresses and MQTT topics that can be customized to match existing systems. Web-based configuration via Ethernet allows technicians to set network parameters, I/O behavior, and communication preferences from a browser, reducing configuration time on site. For RS485 setups, parameters such as baud rate, parity, and node address can be changed to match the host controller. MQTT settings are simple to enter so that connecting to public or private brokers is fast and reliable

This product is particularly well-suited to greenhouse automation because it scales to meet diverse control needs. Use the inputs to monitor door and window sensors, soil moisture probes, light sensors, and float switches. Use the outputs to control actuators like solenoid valves, exhaust fans, misting systems, heating elements, and shade curtains. The mix of many inputs and outputs on a single module reduces the amount of wiring and lowers the total number of units required, simplifying management and cutting installation costs

Energy management is another strong advantage. By integrating sensors, timers, and automated controls, growers can ensure equipment runs only when needed, reducing electricity and water consumption. Scheduled actions and conditional logic implemented through a host controller or cloud service make it easy to automate sequences such as night-time heating, daytime ventilation, or cyclic watering based on sensor readings. MQTT connectivity allows remote monitoring of energy usage and environmental conditions, helping managers spot issues early and react quickly

Maintenance and support are user-friendly. The relay module’s LEDs and status outputs provide early warning of failures or mis-configurations, and its modular design means replacements can be handled with minimal downtime. It is compatible with many third-party monitoring and control systems, easing integration into existing setups. The sturdy relay components and well-protected communication ports are chosen to endure the rigors of greenhouse environments, where humidity and temperature swings are common

Installation tips: mount the module on a stable DIN rail within an electrical cabinet, keep communication and power wiring separate from high-voltage AC lines where possible, and use ferrules on wire ends for secure terminal connections. For RS485 trunks, use twisted pair cabling and proper termination resistors to maintain signal integrity across long runs. For Ethernet and MQTT setups, secure the network with strong passwords and, where available, use VPNs or private networks to keep control traffic safe from unauthorized access

The Qingjun Huaqingjun 32DI 32DO RS485 Ethernet Relay Module is a robust, feature-rich IO solution for greenhouse automation. It combines a large number of inputs and outputs, durable 10A G2R-1 relays, and flexible communication via Modbus RTU/TCP and MQTT. Designed for ease of installation, reliable operation, and broad compatibility, it helps growers automate environmental control, reduce resource use, and manage systems remotely with confidence. Whether expanding an existing control system or building a new automated greenhouse from the ground up, this module provides the IO capacity and connectivity needed to keep crops healthy and operations efficient