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Forum Post: TIDM-DELFINO-ETHERCAT: EtherCAT header - byte order.

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Part Number: TIDM-DELFINO-ETHERCAT Hello, I am analysing EtherCAT frame using wireshark and I found something doesn't fit to ESC documentation. In document ESC technology I can find out that EtherCAT header looks like this: In wireshark capture I can see this: Length: 0x059 Res: 0x0 Type: 0x1 According to picture from documentation I would say that EtherCAT header should look like this: 0x059 0x00 0x01 which is 0x5901 together (equals 01011001 00000001 b). As you can see wireshark shows that second byte is different and EtherCAT header equals 0x5910 which is 01011001 00010000 b. It looks like order is different and it is: Length -- Type -- Reserved. In documentation I can't see anything about swaping bytes. That situation makes me a little bit confused. How can I explain it? I appreciate any help. Best regards, Dawid.

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