The following "undocumented" commend list was posted by MXMXMX of the rcgroups forum.


:CHANNEL:ACTIVE?
Returns which channel is active, i.e. will be affected when changing the vertical scale or position.

:CHANNEL:ACTIVE CHANNEL1
Makes channel 1 the active channel

:DISPLAY:SCREEN?
:DISPLAY:SCREEN INVERTED
:DISPLAY:SCREEN NORMAL
With these commands the screen can be inverted and changed back to normal.

:SYSTEM:DATA?
Returns 112 bytes of data.

:IO:TEST ECHO
Returns the data passed to the command ("ECHO" in this case).

:WAVEFORM:DATA? XY
Returns 2048 bytes of data.
:WAVEFORM:DATA? ROLL
Returns 2048 bytes of data.
:WAVEFORM:MEMORYDATA?
Maybe a synonym for ":WAVEFORM:DATA?"?
:WAVEFORM:POINTS:MODE MAXIMUM
Allows to read entire memory contents with ":WAVEFORM:DATA?" when the acquisition is stopped. See posting below for more information.
:WAVEFORM:POINTS:MODE NORMAL
Switches back to "normal" mode where ":WAVEFORM:DATA?" returns only 600 points.

:STORAGE:TYPE?
Returns "WAVEFORMS".

:INFO:SERIAL?
Returns the serial number.
:INFO:SERIAL 12345
Sets(!!) the serial number returned by "*IDN?" and shown in the "System Info" dialog.
:INFO:MODEL DS1xxxx
Sets(!!) the model returned by "*IDN?" and shown in the "System Info" dialog.
:INFO:POWERUPTIMES?
Returns the number of times the scope was powered up.
:INFO:EQUTRIGDELAY?
For my scope, it returns "-5.30e-09". Careful(!!): There is also a command to change this setting. I expect changing this setting could break your scope.
:INFO:REALTRIGDELAY?
For my scope, it returns "8.00e-10". Careful(!!): There is also a command to change this setting. I expect changing this setting could break your scope.
:INFO:KEYS?
Returns the key code required to unlock the keys if locked via the "Special Mode" menu.
:INFO:KEYS 121212
Changes the key code.
:INFO:ULTRASCOPE?
Returns "OFF".

:COUNTER:VALUE?
Returns the value of the hardware counter.

:RS232:BAUD?
Returns the baud rate of the serial interface.
:RS232:BAUD 19200
Changes the baud rate of the serial interface.

*RIGOL
Switches to Rigol's command set.
*TEK
Switches to a command set, which tries to emulate a Tektronix scope to some degree.
:WHOAREYOU?
Returns "I'm RIGOL" if the Rigol command set is active.