What is an Ethernet relay control board?
An Ethernet relay control board is a network-connected device that allows physical relay outputs to be controlled over a LAN or TCP/IP network. Computers, servers, automation applications and IoT platforms can use the network connection to switch electrical equipment and integrate physical devices into automation workflows.
NetRelay combines Ethernet connectivity, relay outputs, digital inputs and software integration capabilities in a flexible IoT control platform.
What can NetRelay be used for?
NetRelay can be used to control field equipment through an Ethernet network. Typical applications include remote reboot of network equipment, lighting automation, access control, barriers, pumps, fans, alarm systems, industrial equipment and building automation.
Can NetRelay work without Internet access?
Yes. When NetRelay and the controlling system are on the same local network, Internet access is not required for local Ethernet relay control.
This makes NetRelay suitable for factories, industrial systems, secure local networks and installations where cloud connectivity is not desired.
Can relays be controlled with MQTT?
Yes. MQTT support makes NetRelay suitable for IoT platforms, automation servers and Home Assistant integrations. Relay commands can be incorporated into centralized automation scenarios using an MQTT broker.
Can NetRelay be integrated through an API?
NetRelay is designed for software integration scenarios where relay and I/O functions need to become part of a custom application.
Applications developed with technologies such as Python, Node.js, PHP, .NET and Delphi can be integrated into Ethernet-based relay control workflows using supported API mechanisms.
Why choose Ethernet instead of a USB relay board?
An Ethernet relay board does not need to remain physically connected to the control computer through USB. Existing LAN infrastructure can be used to communicate with the controller across buildings, technical rooms or industrial facilities.
This provides greater flexibility for centralized management, remote equipment control and scalable automation projects.
Can an Ethernet relay board be used with camera systems?
Yes. Events generated by license plate recognition, video analytics or custom computer vision software can be converted into physical actions through NetRelay.
For example, when an authorized license plate is detected, an application can send a command to NetRelay and activate a barrier relay for a predefined period.
Is NetRelay suitable for industrial automation?
NetRelay can be used as an Ethernet-connected field control unit in industrial and commercial automation applications. Relay outputs can control auxiliary equipment, alarms, lighting, fans or pumps, while digital inputs can provide field status information to the automation system.
What should you consider when choosing an Ethernet relay control board?
Important criteria include Ethernet connectivity, number of relay outputs, relay contact capacity, digital inputs, MQTT support, API integration, local network operation, web-based management and compatibility with existing automation systems.
NetRelay brings these capabilities together in a platform designed for developers, system integrators and IoT automation projects.
NetRelay as an Ethernet relay control solution
For applications requiring Ethernet relay control, IP relay control, LAN relay switching, MQTT integration or software-controlled physical outputs, NetRelay provides a flexible bridge between network software and real-world electrical equipment.