- Principle:
The software operates under Windows 9x. Unfortunately, Windows has
no real-time functions. In order top avoid interruption and suspension
of the control software when other system tasks are awaken, the operation
of sending commands to the stepper motors commands are scheduled through
a hardware interrupt. This interrupt is triggered by an external timer
(part of the control electronic), and wakeup the driver. The driver
decrease a counter which controls the movement. The frequency of
the timer is controlled through a potentiometer (GP98 interface) or derived
from a cristal oscillator (BB2XXX and later).
Prioir to any cut operation, one must adjust the timer or verify that
it is operating correctly.
- Menu:
The current value of the external timer period is displayed in the
window.
- Adjustment procedure (only for GP98 control board)
- Prior to any cut operation,
- Activate the function CNC[Timer Calibration],
- Turn the potentiometer until a 0.5 ms value is reached.
- Resume to your wing defintion with the menu Project[Wing Configuration]
- Notes: For BB2xxx control boards, the menu shall display 0.5 ms or very nearby (0.49 ms very often) if the hardware is configured properly. With latest versions of the software, the timer tick value is a parameter which may be adjusted.