Ethernet

Ethernet Network Module

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Overview

An Ethernet network module with a complete TCP/IP stack — TCP and UDP at 10/100 BASE-T over a standard RJ45 LAN connector. The module handles the network stack internally, so your host code opens sockets, reads, and writes with simple text commands over any supported interface.

Common uses: local-network IoT projects, building automation on a wired LAN, controlled-intranet dashboards, classroom networking labs, and bridging DUELink modules into existing wired infrastructure.

No SSL/TLS support

This module does not support secure (encrypted) connections. It works well on trusted local networks and controlled intranets but will not reach modern HTTPS APIs or cloud services like AWS, GCP, or Azure that require TLS.

Key features • Complete TCP/IP stack • TCP and UDP support • 10/100 Base • On-board LAN Connector • 37x27mm Overall Dimension

Resources 📄 Schematics 🔩 3D STEP file PID: 0x030003

🌿 Cables not included

Modules ship without cables to reduce waste. Some specialty boards include a USB cable; for the rest, see Cables to add cables to your order.

Commands

Commands this module accepts. See Samples for runnable code in popular host languages.

Function	Description
Init(b4,b5,b6)	Network configuration b4:IP, b5:GW, b6:Subnet.
Connect(s,l,b6,p)	Connect to socket s, l:local port, b6:ip address, p:port.
Close(s)	Close socket s.
Listen(s,p)	Listen socket s, p:port.
Accept(s)	Accept socket s.
Avail(s)	Returns available size on socket s.
Send(s,b6)	Write to socket s, b6: data.
Recv(s,b6)	Read data from socket s to b6.
DVer()	Returns driver version.

Peek under the hood

The script below is this module's driver — it teaches the hardware how to respond to the commands listed above. It ships pre-loaded from the factory; most users never need to open it.

Ethernet Driver

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See full example on GitHub

Samples

Example code that calls this module's commands from popular host languages.

tip

New here? See Get Started to connect a module and send your first command.

Python

Python Sample

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See full example on GitHub

MicroPython

MicroPython Sample

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See full example on GitHub

JavaScript

JavaScript Sample

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See full example on GitHub

.NET

.NET Sample

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See full example on GitHub

Arduino

Arduino Sample

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See full example on GitHub

On-Module Code

Code that runs directly on this module's MCU. See how On-Module Code allows modules to run standalone.

Script

This example runs using the default DUELink Internal Engine using its Scripting Language, and it expects the module's driver to be loaded first, see the Commands Tab.

Standalone Script Sample

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See full example on GitHub

Arduino IDE

See Arduino IDE page for more info.

Standalone Arduino Sample

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See full example on GitHub

Ordering Info

Product	Part Number	Price
DUELink Ethernet	GDL-CMETHERNET-C	$24.95

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