RTC
®
5 PC Interface Board
Rev. 1.9 e
8 Advanced Functions for Scan Head and Laser Control
160
• The resulting table can be retrieved in binary form
via get_jump_table and reloaded onto the board
via set_jump_table.
8.1.6 Configuring the PosAcknowl-
edge Threshold Value
The control_command command can also be used
to set the PosAcknowledge threshold value. The
default start behavior is for the scan system to set the
threshold value to 0.28% of the full position range
after every power-up or reset. If other threshold
values are desired, they must be separately set for
each axis.
8.1.7 Configuring the Effective Cali-
bration
The servo electronic can also be configured by the
control_command to (down) scale the position
values received from the RTC
®
5 by a specific factor (1,
1/2, 1/4 or 1/8). The position signals (optionally)
returned by the scan systems to the RTC
®
5 remain
unaffected, as do the pre-configured calibrations of
SCANLAB’s scan systems. However, the effective cali-
bration 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 scale factor of 1 (i.e. with SCANLAB’s pre-
configured calibration) upon power-up or after a
reset.
With the control_command, you can also query
SCANLAB’s pre-configured calibration and the
currently selected scale factor.
8.1.8 Configuring the Start Behavior
In their default configuration the iDRIVE
®
scan
systems are pre-configured by SCANLAB so that
• the first tuning (number 0) is selected (also see
section "Configuring Dynamics Settings (Tuning)"
on page 155),
• a PosAcknowledge threshold value of 0.28% of
the full position range (i.e. 0.28% of 2
16
bits) is
set (also see section "Configuring the PosAc-
knowledge Threshold Value" on page 160),
• a scale factor of 1 is set (also see section "Config-
uring the Effective Calibration" on page 160).
The listed settings can be changed via the
control_command. The changed settings are only
temporary, however they can be additionally saved as
starting settings for subsequent power-ups or resets
(power supply switched off and switched on) with
control_command(…, …, 0A00H)
.
As long as the start behavior is not changed as
described, the scan head starts with the starting
settings pre-configured by SCANLAB on every power-
up or reset.
The status return behavior of the scan system can
only be temporarily changed. The corresponding
start behavior is fixed by SCANLAB: after every restart,
the scan system transmits the XY2-100 status word
(also see section "Configuring Status Return Behavior"
on page 153).
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