DT-R004 8-Channel Ethernet Relay Module WiFi LAN RS485 Modbus RTU DIN Rail Housing

Quick Introduction Scale up your automation logic with the DT-R008 (RS485 Edition). Designed for projects where 2 or 4 channels just aren't enough, this industrial-grade controller manages 8 independent circuits and monitors 8 inputs in a single DIN-rail mounted unit. Powered by the reliable ESP32 chip, it offers fail-safe connectivity via wired Ethernet and wireless WiFi, ensuring your critical irrigation or HVAC systems never go offline. The integrated RS485 Interface transforms it into a powerful Modbus gateway for your entire sensor network.

Detailed Specifications

• Model: DT-R008-485-CASE (RS485 Variant with Housing).

• Dimensions: 122mm x 87mm (Standard C45 DIN Rail width).

• Controller: ESP32 (WiFi + Bluetooth).

• Network Interfaces:

  • Ethernet: RJ45 (10/100 Mbps) magnetic isolation.

  • WiFi: 2.4GHz 802.11 b/g/n (High range).

• Serial Interface: RS485 (A/B) for Modbus RTU Master/Slave.

• Outputs: 8x Relays (NO/NC, 10A 250VAC each).

• Inputs: 8x Opto-isolated Digital Inputs (Dry/Wet Contact).

• Power Input: 12V DC or 24V DC (Check label, Non-PoE).

• Power Consumption: ~5W (Max load).

• Protocols: MQTT, Modbus TCP, Modbus RTU, HTTP CGI, CoAP, TCP/UDP.

Quality Advantage & Differentiation Why choose the DT-R008?

1. High Density: Replaces multiple smaller WiFi switches with one centralized, wired board. This reduces IP address clutter on your router and simplifies power distribution wiring.

2. Industrial Robustness: The opto-isolated inputs protect the ESP32 from voltage spikes commonly found in long cable runs from door sensors or limit switches.

3. Local Logic: With features like "Input-Link-Relay", you can program the board (via Web UI) to turn on Relay 8 when Input 1 is triggered instantly, without relying on your WiFi or Home Assistant server to be online.

Key Applications & Usage

• Smart Irrigation: Control 8 different solenoid valves for garden zones. Use the Inputs to read flow meters or soil moisture sensors.

• Central Heating/Cooling: Manage zone valves for underfloor heating (Relays) and read room thermostats (Inputs) directly.

• Factory Signal Tower: Use the relays to trigger different stack lights (Red/Amber/Green/Blue) based on machine status messages sent via Modbus TCP.

• Security Panel: Monitor 8 door/window wired sensors and publish their status to Home Assistant via MQTT instantly over Ethernet.

What's Included & Required

• Included: 1x DT-R008 Relay Module (RS485 Version), 1x Large DIN Rail Plastic Housing (Pre-assembled),1x RC Snubber Kit

• Required: 12V/24V DC Power Supply (Recommended 2A), Ethernet Cable.

The "Virtual Technician" Support Panel

• ⚠️ POWER SUPPLY SIZING:

  • Unlike the 2-channel version, this 8-channel board draws significant current (~5W) when all relays are active.

  • Recommendation: Use a power supply rated for at least 1.5A or 2A (at 12V) to ensure stability during simultaneous switching.

• ⚠️ RS485 BUS:

  • The RS485 port is non-isolated on the standard model. If connecting to equipment with different ground potentials (like heavy machinery), consider using an external RS485 isolator module to protect the ESP32.

EXTERNAL RESOURCE INTEGRATION

•  SDK & Manual Download:
  • Resource Name: Dingtian DT-R008 User Manual & SDK
  • Link: Download SDK (Zip)
  • Description: Contains specific register maps for the 8-channel version and the configuration tool
  • Configuration Utility:
• Resource Name: Dingtian Device Manager
  • Link: Download Tool
  • Description: Required to find the IP address of the device on your network initially.
  • Custom Firmware (Advanced):
• Resource Name: 8-Channel Dev Demo Code
  • Link: GitHub Repository
  • Description: Source code for creating custom firmware for the 8-channel board (Dev Version only).