Scanlab RTC6 PCIe Board - Set_Sky_Writing_Para

RTC6 boards
Doc. Rev. 1.0.21 en-US
10 RTC6 Commands
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Ctrl Command set_sky_writing_para
Function Activates Sky Writing Mode 1 and sets the corresponding parameters or switches
Sky Writing off.
Call set_sky_writing_para( Timelag, LaserOnShift, Nprev, Npost )
Parameters Timelag Sky Writing parameter.
1.0 equals 1 µs.
The Timelag value is used with an accuracy of 1/64 µs.
As a 64-bit IEEE floating point value.
 1/4: Sky Writing Mode 1 is activated.
From 1/8 to 1/4, Sky Writing is activated,
but Timelag = 0 is internally applied.
< 1/8: Sky Writing is deactivated.
LaserOnShift Shift (for positive values: delay) of the point of time, where the are
switched on (see Figure 46).
1 bit equals 1/64 µs.
As a signed 32-bit value.
Negative values smaller than the complete run-in phase are clipped at
runtime, therefore the following applies automatically:
LaserOnShift Modus
 ca. (–40) × Nprev 1
 ca. (–20) × Nprev 2 or 3
Nprev Defines the duration of the run-in phase (see Figure 46).
1 bit equals 10 µs.
As an unsigned 32-bit value.
Allowed value range: 0  Nprev  (2
32
–1).
Run-in duration [µs] Modus
0 × Nprev 1
0 × Nprev 2 or 3
Npost Defines the duration of the run-out phase (see Figure 46).
1 bit equals 10 µs.
As an unsigned 32-bit value.
Allowed value range: 0  Npost  (2
32
–1).
Run-out duration [µs] Modus
0 × Npost 1
0 × Npost 2 or 3
Comments • For information on Sky Writing mode and a description of the parameters, see
Chapter 7.2.4 ”Sky Writing”, page 160.
• If Nprev  65,535, then set_sky_writing_para behaves similarly to set_sky_writing:
Nprev is set to a value of approx. (0.15 × Timelag ).
• If Npost  65,535, then set_sky_writing_para behaves similarly to set_sky_writing:
Npost is set to a value of approx. (0.1 × Timelag ).
• set_sky_writing_para cannot be used to switch back and forth between
Sky Writing Mode 1, Sky Writing Mode 2 and Sky Writing Mode 3 (the proper
command for this is set_sky_writing_mode).