AB6218-B canopen compactcom module

we have bought few AB6218-B modules(canopen compactcom). they are in different versions such az v3.03, v3.04, v3.05. It seems some of them work on our previous developed controller work and establish the communication and some other not. our controller are as the same was before and the only change is on AB6218-B versions, so anyone knows about difference between this versions?I could not fine any document related to version history!


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