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<font face="Dialog" size="2">Hi</font> </p>
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<font face="Dialog" size="2">></font>When reading the EtherCAT Master documentation about FMMU, I meet this sentence: "In order to <font face="Dialog" size="2">></font>make a sync manager react on a datagram accessing its memory, it is necessary to access the last byte <font face="Dialog" size="2">></font>covered by the sync manager." <br><br><font face="Dialog" size="2">></font>I do not understand: which access to the last byte? Whose last byte? The last byte in the datagram? or EtherCAT frame?<br><font face="Dialog" size="2">The byte on the last address within the mailbox address range (see configured mailbox size)</font> </p>
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<font face="Dialog" size="2">></font>How can sync manager identify its datagram by just the last byte?<br><font face="Dialog" size="2">By comparing the given address and the size of the transferred data. A master must either write the full size of the mailbox (even if the real payload is much smaller) or it has to write 2 datagrams: One with the real payload, addressed to the start of the mailbox, and an additional datagram that writes just one byte at the end of the mailbox address range.</font><br><font face="Dialog" size="2"></font> </p>
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<font face="Dialog" size="2">R</font>egards,<font face="Dialog" size="2"></font> </p>
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<font face="Dialog" size="2">Martin</font><br>
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