DT‑R032 32‑Channel Ethernet Relay Module – Industrial Control Board

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Intro Summary
High‑capacity Ethernet relay and input module; feature‑rich, supports Modbus/MQTT/HTTP for industrial and smart home automation.

Product Overview
The DT‑R032 by DTwonder (aka Dingtian) is a robust 32‑relay Ethernet control board with 32 digital inputs. It supports multiple protocols (TCP/UDP/HTTP/Modbus‑RTU & TCP, MQTT, CoAP, SNMP) and interfaces (RJ‑45, Wi‑Fi, RS‑485, CAN, Wiegand). DIN‑rail mountable, it offers IP watchdog, timing, jogging, relay isolation, and relay ratings at 3 A per channel (12–24 VDC/AC) . Controlled by ESP32, it’s compatible with Domoticz, Home Assistant, and OpenHAB .

How to Use

  1. Mount on DIN rail and supply 12–24 V DC/AC or use PoE.
  2. Connect Ethernet and adjust via DHCP/static IP.
  3. Choose protocol: HTTP API, Modbus, MQTT, etc.
  4. Use web GUI or SDK/C# demos for setup.
  5. For ESP32 firmware modifications, compile with Dingtian driver in ESP-IDF .
    Tips:
    • Assign static IPs for reliability.
    • Use IP watchdog to auto-reset when devices go offline.
    • Secure by firewall rules and disabling unused services.
    • Regularly update firmware using provided tools.

Frequently Asked Questions (FAQ)

  1. What voltage does DT‑R032 require?
    Accepts 12–24 VDC or 12–24 VAC; cannot self-power via PoE.
  2. Is PoE supported?
    Yes, via RJ‑45 PoE interface.
  3. What’s the maximum relay current?
    Up to 3 A per relay at 12 VDC.
  4. Which protocols are supported?
    TCP/UDP, HTTP CGI, Modbus‑RTU/TCP, MQTT, CoAP, SNMP.
  5. Can it be used with Home Assistant?
    Yes—native support via integration modules.
  6. Is firmware open-source?
    Demo code available; full flashing requires contacting supplier.
  7. Does it include power supply?
    No—power must be provided externally.
  8. What is IP Watchdog?
    Auto-reboots linked devices if network is unresponsive.
  9. Dimensions and mounting?
    370 × 107 × 27 mm; fits standard DIN‑rail.
  10. Operating temperature range?
    From –10 °C to +85 °C.

User Review Summary
Currently no user reviews found on vendor sites; typical reviews from similar DT modules praise:

  • “Reliable Modbus operations with no disconnects.”
  • “Strong relay isolation—runs industrial loads without issues.”

Comparison with Competing Products

  • Smaller 8‑relay board; best for compact setups; supports PoE & Modbus RTU/TCP; around US$66.
  • Industrial‑grade 10 A relays; PoE/Modbus; solid choice for mid-size automation; ~US$54.
  • 16‑relay ESP32 based; supports ESPHome/Tasmota, ideal if Home Assistant integration is priority (~US$210).

Technical Specifications

  • Channels: 32 relays, 32 digital inputs
  • Relay spec: NO/NC, 3 A @ 12 VDC (16 W total)
  • Power: 12–24 VDC/AC; PoE support
  • Interfaces: RJ45, optional Wi‑Fi, RS‑485, CAN, Wiegand
  • Protocols: Modbus RTU/TCP, MQTT, HTTP CGI, TCP/UDP, CoAP, SNMP
  • Features: IP watchdog, timing, jogging, mutual/exclusion, linkage
  • Mounting: DIN‑rail; size 370 × 107 × 27 mm
  • Temperature: –10 °C to +85 °C

Brand or Manufacturer Info
DTwonder (Dingtian) is based in Shenzhen focusing on ESP32‑based industrial automation boards. They offer open‑demo firmware, SDK, and customer support. Popular in home automation communities for affordable, feature‑rich relay modules .

Purchase Recommendations
DTWonder：https://www.dtwonder.com/product/dt-r032-ethernet-relay-module/

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