Renishaw NC1 Programming Manual page 56

Tool length and radius setting
For an explanation of the meaning of alarms, see "Error messages
and alarms" on page 85.
Examples
Tool length/radius setting 1
Assume the tool is a 10 mm (0.394 in) diameter slot drill.
%_N_????
T1
M6
D1
L9800
R03=3.R14=2. Inputs to set tool length/radius edge D2.
L9862
M30
Tool length/radius setting 2
Assume the tool is an 80 mm (3.15 in) diameter cutter.
%_N_????
T1
M6
D1
L9800
R03=3.R14=2.
R25=38.R19=800. (1.496 in) radial step-over and radial offset
L9862
M30
54
Inputs to set current tool length at 38 mm
edge D2. Controlled rev/min.