RIGOL MSO/DS2000A Series - Manual (Page 187)

Chapter 8 Protocol Decoding RIGOL
MSO2000A/DS2000A User’s Guide 8-9
displayed. For example, when the transmitting terminal is set to none check and
the decoder is set to odd check, the following check error occurs.
Wherein, there are odd number (1) of 1 in the 8-bit data 00000100 and the
check bit should be 0; but the check bit detected on the TX is 1, thus check error
occurs.
After the decoder is set to none check, the decoding becomes normal.
Note: Two error marks will be displayed when end frame error and check error
are detected at the same time.
(00000100，LSB)
The check bit detected is 1