CAN

CAN Bus Interface

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Overview

A CAN bus interface supporting CAN V2.0B with both standard and extended arbitration IDs, plus remote frames. Used widely in automotive electronics, industrial machinery, and any system where multiple controllers share one bus. The module handles arbitration, framing, and CRC internally — your host code sends and receives CAN frames with simple text commands over any supported interface.

Common uses: reading OBD-II diagnostics, vehicle hacking and instrumentation, robot drive-train integration, multi-controller industrial projects, and classroom intro-to-CAN labs.

Key features • Support CAN V2.0B • Standard and extended ArbID • Remote frames • Terminal Block Connector • 42x42mm Overall Dimension

Resources 📄 Schematics 🔩 3D STEP file PID: 0x030001

🌿 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
Bitrate(b)	Sets the b bitrate (125K, 250K, 500K, 1M)
RxFull()	Returns 1 if there is a received CAN message.
RxRd()	Reads a received message. Returns the ArbID of the message or -1 if none. b9 is a 9-byte array contains the message body, with first element containing DLC followed by 0 to 8 bytes of data.
TxFree()	Returns 1 if ready for new data, or previous transmit request succeeded.
TxReq(i,l,b9)	Request to send a message with i EID and l length of the b9 data array. Returns 1 if a message was posted or 0 if busy to take a new one.
DVer()	This 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.

CAN 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 CAN	GDL-CMCAN-B	$14.95

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