Category: CANopen

Dictionary

As you build a modular system you will implement a lot of variables in each module that you might want to change as part of configuration or see as they are sensor values. To do this I create a separate module called a “Dictionary” that is illustrated below. The dictionary itself is a large Index…

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C++ CAN Interface

I am waiting on parts for the USB, SD-Card, Ethernet and Modules so the next task I can work on is the CAN interface. The actual barebone CAN interface is autogenerated by STM32CubeIDE in C, so all we need to do is to create a proper IO queue, deal with timing and error handling. Most…

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CANopen/SIIS2 – Part 1

The industry around me is a heavy user of CANopen (SIIS2) which is the “Subsea” version of a CAN protocol. CANopen is similar to Modbus, but it offer more functionality. It is also a more complicated protocol stack that tend to cost from 5-15K USD depending on content. I have written CANopen protocols in the…

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