Rigol DS1204B Programming Manual page 49

10. :DISPlay:DATA?
Command Format:
:DISPlay:DATA?
Function:
The command queries image data on the current screen, and the data format
accords with IEEE488.2 standard. The data structure is: #800078788+the data
of 8 bit bitmap.
Programming Guide for DS1000B Series
RIGOL
2-41