Scanlab RTC 5 PC Interface Board Installation And Operation Manual page 418

Delayed Short set_encoder_speed
List Command
Function defines the target encoder speed and further parameters for encoder-speed-dependent
automatic laser control.
Call
set_encoder_speed( EncoderNo, Speed, Smooth )
Parameters
EncoderNo
Speed
Smooth
Comments • If Smooth = 0.0, then only the current encoder speed CurrentSpeed (based on counter
pulses received in the most recent 10 µs) will be used; if Smooth = 1.0, then the speed
from the previous clock cycle PreviousSpeed. In general, the used speed is:
Speed = PreviousSpeed · Smooth + CurrentSpeed · (1.0 – Smooth).
• If Speed  0.0 or Smooth < 0.0, then set_encoder_speed will, already during loading,
be replaced by a
• One encoder increment results in four counter pulses.
• The maximum value for Speed (16000.0) corresponds to a counting rate of 16 MHz. The
minimum value for Speed (100.0) corresponds to a counting rate of 1/(10 µs), i.e. one
counter pulse per output period. Beware of the low resolution of encoder-speed-depen-
dent laser control for low speed values! Encoder-speed-dependent correction is only
recommended if substantially more than one counter pulse per output period (10 µs)
are received.
• Also see
® ®
RTC 4 RTC 5 new command
Version info Last change with version DLL 536, OUT 536: EncoderNo = 2 and 3
References set_encoder_speed_ctrl,
®
RTC 5 PC Interface Board
Rev. 1.9 e
10 Commands And Functions
Number of the encoder counter to be used for speed measurement
as an unsigned 32-bit value,
allowed values:
= 0: Encoder counter Encoder0
= 1: Encoder counter Encoder1
= 2 and 3: vectorial encoder velocity: a vectorial velocity is calculated
from both encoder speeds (via the pulse rates of both encoder
counters) for use with encoder-speed-dependent automatic
laser control in Mode= 5.
Higher bits are ignored.
Target encoder speed (counter pulse rate) in [counter pulses/ms]
as a 64-bit IEEE floating point value;
allowed range: [100.0 ... 16000.0]; for Speed > 16000.0, Speed is
clipped to 16000.0, for 0.0 < Speed < 100.0 to 100.0.
Smoothing factor for a 2-stage low-pass filter as a 64-bit IEEE floating
point value; allowed range: [0.0 ... 1.0]; larger values will be clipped.
list_nop (get_last_error
"Encoder-Speed-Dependent Laser Control", page
set_auto_laser_control
return code RTC5_PARAM_ERROR).
148.
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