Omron V440-F, User Manual

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4 Setup
4-10 V440-F C-Mount Code Reader User Manual
In
Continuous Mode
, the reader is in a continuous free-running state. Parts can be presented to reader
at will. During the cycle, the reader will continuously acquire and process images until all symbols are
found or until a user-defined
timeout
is reached. If the timeout is reached,
“Nothing was output”
will
be displayed in the
Output Data
.
In the various triggered modes, the read cycle starts with a trigger. The cycle will end and the reader will
output data after decoding the expected number of codes, or after reaching the end of read cycle condition.
The cycle time includes one or more Capture Times and Decode Times depending on the setup.
In all modes, the units are set respond to both Serial Triggers through RS-232 or TCP, and to physical input
triggers. You are able to set the Serial Trigger characters. The physical trigger is typically set to edge-based,
searching for a transition, but in some cases it's level-based, either high or low. Detailed physical trigger
parameters can be set in the
Trigger
section of the
Advanced Settings > Read Cycle
menu.
In all of the triggered modes, acquisition and image processing can occur in parallel. As images are
acquired, they are put into a buffer pool. When processing is ready, it takes the image out of the buffer
pool and analyzes it. This allows faster overall processing.
It also allows for an
initial burst mode
where the reader can capture all required images from a fast
moving part and then analyze each in turn as it has time. This is accomplished by setting the
Delay
Between Images
to
0
.
The size of the buffer pool is finite, however. If all required images for the read cycle cannot fit in the
buffer pool, the
Delay Between Images
must be set to a value high enough that processing can keep
up, with
Acquire
typically set to slightly longer than the average processing time.
Note:
The maximum size of this buffer is dependent on the maximum image size in the system. It can contain
twenty 5MP images before reusing. If a
Window of Interest WOI
is used to get even smaller images, the
maximum number of captures that can be contained in the buffer pool before overwriting is
254
.
4-3-3 Continuous Mode
4-3-4 Triggered Modes
Introduction
Triggers
Image Buffering and Pipeline Processing