Scan Head Control; Data Transmission Between The Controller And The Scan Head - Scanlab hurrySCAN 10 Installation & Operation Manual

The amount of possible power loss depends, among
other things, on the beam profile of the employed
laser. For a Gaussian beam profile, beam vignetting is
insignificant when the scan angle of each mirror does
not exceed the maximum allowed scan angle defined
on page 34 and when the diameter of the beam
doesn't exceed the specified aperture.
Caution!
• Make sure the aperture and the coatings of the
deflection mirrors meet the requirements of
your application (see "Technical Specifications"
on page 34). For information on tolerances and
deviations, please contact SCANLAB.
• Make sure that the focal length, the typical
image field size and the wavelength of the
objective meet the requirements of your appli-
cation. If this is not the case, then please contact
SCANLAB.
• Check if the wavelength of the input beam and
the maximum ratings for beam diameter and
laser power match the specifications of the scan
head (see page 34).
• When using scan angles larger than the
maximum allowed scan angle indicated on
page 34, some vignetting inside the scan head
and the objective can occur and damage to the
interior of the scan head might result. If your
application requires larger scan angles, then
please contact SCANLAB.
• The maximum allowed scan angle is derived
from the geometric and optical data of the
employed components (see the
"Customized Optical Configuration" on page
In some cases, particularly with sufficiently small
calibration angles, the maximum allowed scan
angle can be larger than the maximum adjust-
able angle. In such cases, the specified
maximum allowed scan angle has no practical
relevance.
®
hurrySCAN 10, digital, 1064 nm, f = 254 mm
Rev. 2.6 e
®
2 The hurrySCAN 10 – Principle of Operation

2.2 Scan Head Control

Data Transmission between the
Controller and the Scan Head
The controller and the scan head are interconnected
via a serial interface for digital data transfer. Data
transmission follows the XY2-100 protocol. In the
process, essentially the following signals are trans-
ferred:
• The controller delivers position values, i.e. set
values for the X and Y axes as well as (optionally)
the Z axis.
• The scan head generates a status signal to be
returned to the controller.
• Two additional channels transmit
the data transport synchronization signal
and a clock signal.
Figure 3
(CLOCK), the synchronization signal (SYNC) and the
three data channels (CHAN1/CHAN2/CHAN3).
Every 10 µs, three 20-bit words (3 control bits, 16
data bits, 1 parity bit) are transmitted serially as
differential signals.
1
2
3
section
Legend
6).
1 CLOCK
2 SYNC
3 CHAN1/CHAN2/CHAN3
Timing diagram of the serial interface signals
shows the timing of the clock signal
1
3 ctr. 16 data bits
t
20
1 p
3
7