RIGOL DS1000B - Manual (Page 32)

RIGOL Command Systems
Programming Guide for DS1000B Series 2-20
10. :DISPlay:DATA?
Command Format:
:DISPlay:DATA?
Function:
The command queries image data on the current screen. The data format
accords with IEEE 488.2 standard. The data structure is: #800078788+the data
of 8 bit bitmap.