Scanlab RTC6 PCIe Board - Configuring the Posack Limit Value; Configuring the Effective Calibration

RTC6 boards
Doc. Rev. 1.0.21 en-US
8 Advanced Functions for Scan Head Control and Laser Control
222
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• If an offset is specified for automatic
determination (by the according
load_jump_table_offset parameter), this offset
is added to all automatically determined delay
values before the overall Jump Delay table gets
calculated by linear interpolation and loaded
onto the board (in addition, the delay values are
clipped to the value range 0…65,535).
The Offset can be used to compensate for
measurement runtime latencies (for example,
caused by an XY2-100 Converter (Accessory), by
tuning switching or by a runtime latency of the
signal returned by the scan system) when
calculating the Jump Delay table. It can also be
used to add a safety margin to the delay values to
compensate for noise-induced random
deviations.
load_jump_table and
load_jump_table_offset( Offset = 0 ) are
identical.
• For simultaneous control of two scan systems,
you should determine the Jump Delay values for
both systems and, after comparing, use the
values of the slower system.
• The resulting table can be retrieved in binary form
by get_jump_table and reloaded onto the board
by set_jump_table.
8.1.6 Configuring the PosAck Limit
Value
control_command( Data = 15nn
H
) can be used to
set the PosAck limit value nn. The default start
behavior is for the scan system to set the limit value
to 0.28% of the full position range after every power-
up.
If other limit values are desired, they must be
separately set for each axis.
8.1.7 Configuring the Effective
Calibration
The servo electronic can be configured by
control_command( Data = 12nn
H
) to down scale
the position values received from the
RTC6 PCIe Board by a specific factor (1, 1/2, 1/4 or
1/8). The position signals (optionally) returned by the
scan systems to the RTC6 PCIe Board remain
unaffected, as do the pre-configured calibrations of
SCANLAB’s scan systems.
However, the effective calibration can be thereby
reduced to confine the scan area to a smaller angular
range – with a higher angular resolution.
The default start behavior is for the scan system to
start with a scaling factor of 1 upon power-up.
By control_command( Data = 053F
H
), the currently
set scaling factor can be read out.