Chapter 7 Protocol Decoding    RIGOL 
DS2000E User’s Guide    7-13 
6.  Error Expressions during Decoding 
When the ACK (ACKnowledge Character) is not met, the red error marks as 
shown in the figure below will be displayed. Note: The red mark is displayed in 
different modes according to the horizontal time base setting; when the 
horizontal time base is relatively smaller, 
 is displayed; otherwise,   is 
displayed. 
 
 
Figure 7-9 Error Expressions during Decoding 
ACK=1