Settings are stored permanently in the controller. $$ shows them, $number=value changes one. In the app you find them with explanations under Machine → Controller settings …; for critical values the app asks before changing. Write down the values before changing anything.
$0 · Step pulse
Length of a step pulse for the motor drivers. Unit: µs.
$1 · Motor idle delay
How long the motors stay energised after a move; 255 = always on (holds position). Unit: ms.
$2 · Invert step signal
Bit mask per axis (X=1, Y=2, Z=4).
$3 · Invert direction
Bit mask per axis (X=1, Y=2, Z=4). If an axis moves the wrong way, invert it here.
$4 · Invert enable
Inverts the enable signal of the motor drivers.
$5 · Invert limit switches
For switches that are closed at rest.
$6 · Invert probe
Inverts the Z probe signal.
$10 · Status report
Bit 0: machine instead of work position, bit 1: report buffer state. The app copes with every value.
$11 · Junction deviation
How far the path may deviate at corners to keep moving smoothly. Unit: mm.
$12 · Arc tolerance
Accuracy with which arcs are split into lines. Unit: mm.
$13 · Report in inches
Report positions in inches instead of millimetres. Leave off (0) for this app.
$20 · Soft limits
Prevents moves beyond the work area. Needs homing ($22).
$21 · Hard limits
Stops the machine immediately when a limit switch triggers.
$22 · Homing
Enables homing ($H). Only switch on with limit switches.
$23 · Homing direction
Bit mask per axis; sets on which side the switch is searched.
$24 · Homing feed (fine)
Slow speed for precisely approaching the switch. Unit: mm/min.
$25 · Homing seek
Speed used to search for the switch. Unit: mm/min.
$26 · Debounce time
Wait time against switch bouncing. Unit: ms.
$27 · Pull-off
Distance the axis moves back after the switch. Unit: mm.
$30 · Max spindle speed
Speed at full PWM signal. Should match the spindle so that S values are right. Unit: rpm.
$31 · Min spindle speed
Speed at minimum PWM signal. Unit: rpm.
$32 · Laser mode
For lasers: power follows the motion without stopping. Always off (0) for milling.
$100 · Steps/mm X
Motor steps per millimetre. Wrong values lead to wrong dimensions. Unit: steps/mm.
$101 · Steps/mm Y
Motor steps per millimetre. Wrong values lead to wrong dimensions. Unit: steps/mm.
$102 · Steps/mm Z
Motor steps per millimetre. Wrong values lead to wrong dimensions. Unit: steps/mm.
$110 · Max rate X
Fastest move of this axis (also rapids). Unit: mm/min.
$111 · Max rate Y
Fastest move of this axis (also rapids). Unit: mm/min.
$112 · Max rate Z
Fastest move of this axis (also rapids). Unit: mm/min.
$120 · Acceleration X
How fast the axis accelerates and brakes. Unit: mm/s².
$121 · Acceleration Y
How fast the axis accelerates and brakes. Unit: mm/s².
$122 · Acceleration Z
How fast the axis accelerates and brakes. Unit: mm/s².
$130 · Max travel X
Longest travel of the axis; basis for soft limits and the work area in the app. Unit: mm.
$131 · Max travel Y
Longest travel of the axis; basis for soft limits and the work area in the app. Unit: mm.
$132 · Max travel Z
Longest travel of the axis; basis for soft limits and the work area in the app. Unit: mm.