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Wi-Fi 16 Relay Board PCB - ModBus TCP, Timers

A sixteen channel ModBus TCP/UDP relay board with Wi-Fi 802.11 interface. The relays can be controlled manually with the standart coils commands they also can act like timers. Supported by DRMv3 Software. Works with Home Assistant, Domoticz and OpenHAB home automation systems as well as with Node-RED IoT platform. Supported by many modbus applications and profesional software. This is the PCB version.

Supply Voltage:
Price: $100.50
Quantity: + -
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  • Communication protocol: ModBus TCP / ModBus UDP;
  • 16 SPDT relay channels (the type depends on the stocks quantity in our store):
    • TONGLING - JQC-3FF-S-Z (10A / 250VAC, 15A / 120VAC, 10A / 28VDC)
    • SUNHOLD - RAS xx15 (10A / 250VAC, 15A / 120VAC, 15A / 24VDC) 
  • 16 independent timers with resolution 100ms;
  • Option for loading relays states on boot: last saved, predefined or OFF;
  • Supply source is selectable during purchase:
    • 12V DC / 600mA;
    • 24V DC / 400mA;
  • Wireless Wi-Fi 802.11 b/g/n standart;
  • Supported Wi-Fi modes: AP (Access Point), STA (Station) and AP+STA (Access Point + Station);
  • Supported Wi-Fi encryption modes:
    • WEP;
    • WPA2PSK-AES;
  • WEB server configuration of system parameters;
  • WEB server secure login authorization;
  • Standart network protocols: DHCP, DNS, ICMP (ping);
  • Led indicators: Relays, Power ON, Wi-Fi link, Ready Status;
  • Hight quality PCB: FR4 / 1.5mm / two layers / metalized holes / HAL / white stamp / solder mask / extra PCB openings for better voltage isolation / doubled PCB tracks for better voltage isolation;
  • Operating temperature range: from 0 ºC to +70 ºC;
  • Dimensions: W=82mm x L=203mm x H=24mm;
  • Supported by DRMv3 Software (Windows, Linux, Raspbian) - New;
  • Supported by Home Assistant home automation software - New;
  • Supported by openHAB home automation software;
  • Supported by Domoticz home automation software;
  • Supported by Node-RED IoT platform;
  • Supported by various third parity software (Android, iOS, Windows);
  • Control from command line tool;
  • Comes with free configuration/control demo software - download
  • Software examples: here;
  • Documentation: here.


Please note the product does not come with power supply adapter that you may need. We offer suitable adapters with plug-in outlet or DIN Rail BOX on this link:



Application Examples

  • Home Automation
  • Industrial Automations
  • HVAC





Supported ModBus TCP commands

  • Read Coils (0x01)
  • Write Single Coil (0x05)
  • Write Multiple Coils (0x0F)
  • Write Single Holding Register (0x06)
  • Read Multiple Holding Registers (0x03)
  • Write Multiple Holding Registers (0x10)
  • Report Slave ID (0x11)

Warning: please note it is not possible to connect multiple devices from this type in single modbus network. This means the computer/smartphone is the master and the only Wi-Fi 16 Relay Module - TCP Modbus is the slave.



Access from Home Assistant

Home Assistant is very powerful home automation system. Please checkout our application note for more information.




Access from OpenHAB

OpenHAB is a third party open source free home automation software.

There are two ways of communication - via ModBus-TCP requests. More information about the integration with our hardware - or contact with us.




Access from Domoticz

Domoticz is a free open source popular home automation software which can run on Windows, Linux, MAC, Rasberry PI and others. It is a home automation system design to control various devices and receive input from various sensors. Access it with apps for the web, iOS, Android and others.


More information about how to connect and use it with our hardware - or contact with us.

For Hardware configuration, please use: Type = Denkovi Modules with LAN (TCP) Interface, Model = WiFi 16 Relays-TCP Modbus, Slave ID = 1




Access from Node-RED

Node-RED is a flow-based programming platform for the Internet of Things. We prepared small example for communication between Node-RED and our device. More info about Node-RED and denkovi modules: here

You can download the example Node-RED flows from here: ModBus-TCP




Access via software DRMv3

This device is supported by DRMv3 Software.

The device can be found in the device list under the default name: Wi-Fi 16 Relay ModBus TCP








Control from Denkovi Wi-Fi 16 Relay TCP Modbus App

This is free software for easy configuration/monitoring/control the Wi-Fi 16 Relay Module.


Control from iOS mobile apps

The Wi-Fi 16 Relay Module can be controlled/tested easily with Modbus Peek & Poke



Control from Windows

The Wi-Fi 16 Relay Module can be controlled/tested easily with Modbus Poll. Download the mbp description file for Holding Registers.




Packet Sender is also very useful tool for TCP/UDP packets sending. It supports GUI but there is also command line interface (CLI) which allows the relays to be controlled from command line


Controlling from command line console is also very easy. Here we have prepared some example commands for turning ON/OFF relays - download.


Configuration via Web Browser

The built-in web server provides ability for basic configuration of the module, like network settings, TCP/IP and UDP sockets parameters, wireless settings, passwords. Please note the relays can not be controlled via the web server!


Wi-Fi 16 Relay Module ModBus TCP - web server






Third party software


Software examples (SDK)

  • Node-RED IoT platform - example communication flows for ModBus-TCP. More about Denkovi modules and Node-RED: here.


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