Text commands (from the Help command) were posted for the side brush at viewtopic.php?p=132219#p132219
SetMotor SideBrushEnable etc.
SideBrushEnable - Enable Side Brush Motor motor
SideBrushDisable - Enable Side Brush Motor motor
SideBrushOn - Enable the Side Brush
SideBrushOff - Disable the Side Brush
SideBrushPower - Side Brush maximum power in milliwatts (presumably has a default value if omitted)
Neato Control just sends such commands with its graphical interface. These commands are not included in the USB manual at the Neato website, never updated for Botvac
 SetMotor requires TestMode ON -- how Neato Control turns that on and off don't know, maybe automatic. Test mode turns on power lines to motors, which then turn under PWM signal controls. TestMode must be manually turned off (done by orderly exit from Neato Control I think, disconnecting before closing).