Rigol DS1204B Programming Manual page 29

Function:
The command adjusts the trigger offset to the horizontal zero point evenly.
64. :KEY:TRIG_LEVEL_INC
Command Format:
:KEY:TRIG_LEVEL_INC
Function:
The command increases the trigger level evenly.
65. :KEY:TRIG_LEVEL_DEC
Command Format:
:KEY:TRIG_LEVEL_DEC
Function:
The command decreases the trigger level evenly.
66. :KEY:TRIG_LEVEL_Z
Command Format:
:KEY:TRIG_LEVEL_Z
Function:
The command adjusts the trigger level to zero.
Programming Guide for DS1000B Series
RIGOL
2-21