How do I use CANOpen on a Maxon's EPOS controller

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I am a french student in robotics and I have a project in which I have to connect 3 EPOS and my computer via EPOS 3.

I already wrote a programm in C++ to send bytes but I don't understand what to send and when. For my project, I want to have the computer in master mode to send data to each controller (has orders) and when they all recieved it, I activate them by sending a global message and put them to sleep when they are finished

I read a lot of documentation and I think I want to initialze the NMT first ? But I can't find anything such as an example or anything more than abstracts schematics.

I used a programm given by maxon to send bytes directly and the controller respond but never what I expect it to be. And when I try to initialize it, the led on the controller shows me that it's not initialize.

Anyway thank you for everyone who will take the time to reply !

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