RTC
®
5 PC Interface Board
Rev. 1.9 e
10 Commands And Functions
253
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Comments
Notes on the SetPositionScale command (Code
H
= 12
H
):
• If the scale factor for scaling the position values is changed, then the application program’s
calibration factor for calculating RTC
®
5 control values (in bits) from the desired image field
position values (in mm) (see
) needs to be subjected to an inverse proportional
scaling. In addition, the jump and marking speed should be adjusted.
• The currently set scaling factor can be queried with
Data
= 053F
H
.
Note on the SetPosAcknowledgelevel command (Code
H
= 15
H
):
• The threshold value must be specified related to a 16-bit position range. This value is converted
by the RTC
®
5 to a value related to a 20-bit position range by multiplying by 16 (and if appli-
cable reconverted by the XY2-100 converter).
• 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 (for i
DRIVE
®
scan systems with SL2-100 interface,
this corresponds to 0.28% of 2
20
bits, for i
DRIVE
®
scan systems with XY2-100 Enhanced inter-
face to 0.28% of 2
16
bits i.e. 183 bits; in both cases, this corresponds to
Code
L
= 183 = B7
H
).
If other threshold values are desired, they must be separately set for each axis (
Code
H
= 15
H
).
SCANLAB recommends setting only threshold values (
Code
L
) above 14
H
(i.e. 0.03% of the full
position range). Lower values can lead to frequent system safety shutdowns due to Position
Acknowledge time outs (set position not reached for an excessive time).
RTC
®
4
RTC
®
5 unchanged functionality
Note that all returned data selected via
control_command
are always in the RTC
®
5’s
20-bit range, even in RTC
®
4 compatibility mode (also see comments above and comments for
Version info
Last change with version DLL 520 (see
References
,
,
Ctrl Command control_command