3
Installation Orientation
The following figure illustrates a front view of the EM1399-LD after correct installation. From left to right in
the figure are lens and illumination (aiming), with decoder board on the top and mounting holes on the
bottom.
Optics
Window Placement
The window should be positioned properly to let the illumination and aiming beams pass through as much
as possible and no reflections back into the engine (reflections can degrade the reading performance).
The window should be mounted close to the front of the engine (parallel). The maximum distance is
measured from the front of the engine housing to the farthest surface of the window. In order to reach
better reading performance, the distance from the front of the engine housing to the furthest surface of
the window should not exceed 2mm and the distance from the front of the engine housing to the nearest
surface of the window should not exceed 1mm.
If the window is required to be in a tilted position, the above distance requirements should be met and tilt
angle should ensure no reflections back into the lens.
