Canon GM-1000 - Manual (Page 21)

CANON Digital Galvano Scanner System GM-1000 Series
Users Manual 1.20
21
2.8.1. Number of Encoder Pulses
This section explains the relationship between the galvano scanner motor rotating angle and the
number of encoder pulses.
Control commands and some of the parameter angle settings use the number of encoder pulses.
The controller divides one encoder cycle into 8,192, and this is the number of encoder pulses.
Depending on the type of encoder included on the motor, caution is necessary as the number of
pulses for the same specified angle can differ.
Many commands use pulses as a unit in the RS-232C communication command parameter data used
for operations.
In the case of the GM-1010 for example
1 rotation (360°) = 1,000 cycles = 1,000 × 8,192 = 8,192,000 pulses
1° (angle of equipment) = 8,192,000 pulses × 1 / 360 = 22,756 pulses
Resolution = 360° ÷ 8,192,000 pulses = 0.0000429° = 0.77 urad
Each motor is as follows.
Motor type GM-1010 GM-1015, GM-1020
Included encoder cycles / 1
rotation 360°
1,000 cycles 1,500 cycles
Number of pulses 8,192,000 pulses 12,288,000 pulses
Command resolution (1 pulse) 0.77 urad 0.51 urad