Symbol SE 2223, Integration Manual

Page: 24 / 260

1-7
Getting Started
If a non-inverting driver is used to buffer the DLED* line, the output of the driver should be
connected to the cathode (-) end of the LED.
Electrical Interface
See Table 2-2 on page 2-4 for the pin functions of the SE 2223/3223 interface and typical
input and output circuitry.
Scanning Patterns
The SE 2223/3223 generates four scanning patterns based on the software command
received at the interface. These patterns are raster, semi-omni, and cyclone. The slab and
raster patterns can be used to read1-D bar codes and PDF symbols. The cyclone pattern
reads 1-D bar codes in an omnidirectional manner.
Raster Scan Pattern
The decoder determines when to open the “slab” to a full raster depending on the bar code
presented to the SE 2223/3223. For a 1-D bar code the SE 2223/3223 can remain in the
slab pattern until the bar code is decoded. When reading a PDF417 bar code, the decoder
instructs the SE 2223/3223 to open the raster pattern to the height of the bar code
presented. Figure 1-2 illustrates the slab and full raster patterns.