Rigol DS6000 Series User Manual page 167

7 Protocol Decoding
(00000100, LSB)
The check bit detected is 1
Wherein, there are odd number of 1 in the 8 bit data 01010010 and the parity bit
should be 0. Howerer, parity error is generated as the parity bit on TX is 1.
After the decoder is set to none check, the parity bit will be 0 and the decoding
becomes normal.
Note: two error marks will be displayed when end frame error and check error
are detected at the same time.
DS6000 User's Guide
RIGOL
7-9