The USB Port
Bus 006 Device 006: ID 1ab1:0588 Rigol Technologies DS1000 SERIES
This is just the device and vendor id as the one of the Rigol DG1022 Arbitrary Waveform Function Generator USB port.
Rigol’s Application Notes
- What are the number of points captured by a DS1000E/D and replayed on a DG1022?
The attached FAQ describes how waveform files (WFM file extensions) are mapped to the DG1022 arbitrary waveform mode.