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AFE4404EVM: The meaning of the 21st byte

Part Number: AFE4404EVM

Hi team,

In communication between the PC and the AFE4404EVM, what does the 21st byte in the message (screenshot below) mean?

The customer said that an agent said it was a pulse count, but the document states “don’t care ”, so what exactly does the 21st byte mean?

Thanks,

Amy