Using C/CS-Mount Lenses
Aperture Setting
Because of the extreme sensitivity of the DataMan image sensor, for most applications, a small aperture (F8 or less)
provides sufficient light for full-rate image processing while also maximizing depth of field.
Selecting Optimum Focus
You can enter live video, but for best focus optimization, place the reader in automatic trigger mode and adjust the focus
until the peak read rate is obtained.
Optimizing Performance
Read Interval and Timeout Configuration
Careful configuration of the read interval (Self and Continuous triggering) or timeout value (Burst mode) can improve
read rates and throughput.
l If your application uses clearly printed symbols, you can improve performance by reducing the interval or timeout
value. This is because DataMan acquires images at such a high rate that a shorter timeout or interval allows the
reader multiple chances to decode the symbol.
l If your application experiences poorly printed or degraded symbols, increasing the interval or timeout value can
improve performance by allowing the DataMan to spend more time decoding difficult images.
In all cases, make sure that you specify an interval that allows the reader to capture at least one image of the symbol.
Optimizing Burst Trigger Parameters
Since a Burst trigger is ideal for moving applications, it is necessary to determine the correct burst size and interval in
order to capture the desired length of the part as it moves under the camera. Once the interval time is determined, you
can adjust the size of the burst depending on the length of the part. The variables necessary for this calculation are:
1. Line speed in mm per second
2. Code size w/quiet zone in mm
3. FOV = Field of View (x or y) in mm
You can then use the following equation to determine the interval time:
Interval Time = 1000 * ((FOV – 2(Code Size)) / Line Speed)
Once the interval time is determined, the size of the burst can be adjusted depending on the length of the code to
capture. The max object length in mm is:
Burst Size * (FOV – (2*Code Size))
The (2 * Code Size) variable allows for overlap of the frames taken. This takes into consideration the condition where the
code is slightly out of the field of view in one frame (acquisition). The (2 * Code Size) will overlap the field of view
between successive frames and allow the code to be viewed in the field of view of the next frame.
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Operations Guide
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