Chapter 8 Protocol Decoding    RIGOL 
MSO4000/DS4000 User’s Guide  8-19 
 
 
 
9.  Error expressions during decoding 
In I2C decoding, when ACK (acknowledgement) is 1, ACK error occurs. When 
the decoding is correct, the ACK information is displayed as turquoise patch; 
when the detected ACK is 1, red error mark (
,  ,   or  ; the display form 
is related to the horizontal time base and the display format of the bus) is 
dispalyed.  
 
 
 
 
 
 
 
 
 
 
The detected ACK is 1 
SCLK 
SDA 
Address Information (Write Address) 
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