Rigol DS6000 Series User Manual page 190

RIGOL
5. Error Expressions during Decoding
In I2C bus, the front part of each frame of data contains the address information
and blue patches are used to represent address ID. In the ID, "Write" is used to
represent writing address and "Read" is used to represent reading address.
When the ACK (ACKnowledge Character) is not met, the red error marks as
shown in the figure below will be displayed.
7-12
ACK=1
7 Protocol Decoding
DS6000 User's Guide