RTC
®
5 PC Interface Board
Rev. 1.9 e
10 Commands And Functions
253
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 page 119) 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 iDRIVE
®
scan systems with SL2-100 interface,
this corresponds to 0.28% of 2
20
bits, for iDRIVE
®
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
get_value).
Version info Last change with version DLL 520 (see page 612)
References get_value, get_values, get_head_status, set_trigger, set_trigger4, get_waveform
Ctrl Command control_command
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