Microscan QX Hawk User Manual page 171

Parameters
PDF417
Used in applications where a large amount of information (over 32 characters) needs to be
encoded within a symbol, typically where the symbol is transported from one facility to another.
For example, an automobile assembly line might use a single symbol with multiple fields of
information that will be read at several stations along the way, without reference to a
database.
A two-dimensional, multi-row (3 to 90), continuous, variable-length symbology that has high
data capacity (up to 2,700 numeric characters, 1,800 printable ASCII characters, or 1,100
binary characters per symbol). Each symbol character consists of 4 bars and 4 spaces in a
17-module structure.
Note: Sending <a1> from ESP's Terminal will cause PDF417 data to be prefaced with
information consisting of error correction level (ECC Level n), number of rows (n Rows),
number of columns (n Columns), number of informative code words (n Info Code Words)
and the number of data characters (n Data Characters). This feature can be disabled by
re-sending <a1>.
Fixed Symbol Length Status
When Enabled, the imager will reject any PDF417 symbol that does not match the Fixed
Symbol Length.
Fixed Symbol Length
Used to increase data integrity by ensuring that only one symbol length will be accepted.
When enabled, the PDF symbol must contain the same number of characters as the symbol
length setting before it can be considered a good read. The imager will ignore any symbol
not having the specified length.
Note: Fixed Symbol Length Status must be enabled for Fixed Symbol Length to take effect.
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QX Hawk Industrial Imager User's Manual