TEL-SERX4 technical documentation

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Revision as of 07:27, 11 October 2020 by Andrew (Talk | contribs) (Description)

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Compulab part number



TEL-SERDB9 Provides USB to Multiprotocol(RS-232, RS-485-Half Duplex, RS485-Full Duplex) serial connection (up to 4 Ports per TEL).

                       RS-232 / RS-485
USB <--> USB HUB <---> RS-232 / RS-485
                       RS-232 / RS-485
                       RS-232 / RS-485
RS-485 - Globally enable Termination resistor. - User Switchable
       - Globally Switched Between Half Duplex and Full-Duplex mode. - User Switchable

  • Simple USB Connection protocol
  • Supports Multiprotocol implementation on one DB9 Connector.
  • Individually enabled between RS-232 or RS485 ports.
  • Build-in Termination resistor.
  • Protocol switching using Onboard switches or using I2C expander

TEL-SERDB9 is utilizing a USB2 interface Multiple TEL-SERDB9 cards can be installed in a system


  • CANbus through DB-9 Connector
  • Implemented using STM32F042C6 MCU


  • 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.
  • Default CANable USB CDC implementation & candleLight USB device implemintation.
  • DIP switch for enabling/disabling on-board 120 Ohm termination
  • 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

Connection requirements

Host interface


Physical connection


Version information

Latest HW Version Rev 1.0

Block diagram

TEL-CANBUS Rev.1.0 block Diagram.jpg

Mechanical model

ToDo: Add 3D model

Hardware design files

ToDo: Add Gerbers 
ToDo: Add Schematics

Software source files

ToDo add files