TEL-CANBUS technical documentation

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Compulab part number



TEL-CANBUS provides a CANbus interface with isolation through a DB-9 connector.

  • Single CAN device
  • Supports CAN 2.0A Specifications.
  • Supports ISO 11898-2
  • Up too 1Mbit/s bit rate.

ToDo: CANbus version? - Added
ToDo: Data rate? - Added 

TEL-CANBUS is utilizing a USB2 interface. Multiple TEL-CANBUS cards can be installed in a system.


  • CANbus through DB-9 Connector
  • Implimented using STM32F042C6 MCU
ToDo: single CANbus device or multiple? More information about CANbus capabilities - Added
ToDo: microcontroller? Which? - Added


  • Windows and Linux support
    • Driverless operation in Windows
    • USB native device in Linux

Electrical and environmental

  • Isolation per UL 1577
  • Transient immunity: 30kV/uS.
  • Isolated DC 5V power
  • Ambient Operation from –40°C to 85°C.


  • Two Code implementations in one device switchable by a DIP Switch.
  • Defult CANable USB CDC implementation & candleLight USB device implimintation.
ToDo: please elaborate what are the code implementations - Added 
  • DIP switch for enabling/disabling on-board 120 Ohm termination
ToDo: can the firmware be upgraded? How? - Added 
  • Upgradeable using build-in MCU bootloader and openly available tools. (Please follow update guide in GitHub)

Open source hardware and software

  • Complete hardware design files are available
  • Complete firmware is available
  • Designed for Hacking - Easily scriptable Python SW library for easy and cross-platform communication to the device
ToDo: firmware or software, not clear - Added 

Connection requirements

Host interface


Physical connection


Version information

Latest HW Version Rev 1.0

Block diagram

TEL-CANBUS Rev.1.0 block Diagram.jpg

ToDo: Add block diagram - Added
ToDo: nice looking DB-9 Pinout

Mechanical model

ToDo: Add 3D model

Hardware design files

ToDo: Add Gerbers 
ToDo: Add Schematics

Software source files

ToDo add files