Microscan Quadrus EZ, Руководство пользователя, Страница: 179 / 366

Quadrus EZ Reader User’s Manual
6-7
Symbol Quality
Unused Error Correction
Definition:
The correction capacity of Reed-Solomon decoding is expressed in the
equation, e + 2d < d - p, where e is the number of erasures, t is the number
of errors, d is the number of error correction code words, and p is the
number of code words reserved for error detection.
The Unused ECC (Error Correction Code) parameter tests the extent to
which regional or spot damage in the symbol has eroded the reading safety
margin that error correction provides. (ISO/IEC 15415) Unused ECC grade
is defined in this way:
A (4.0) if UEC > .62 B (3.0) if UEC > .50
C (2.0) if UEC > .37D (1.0) if UEC > .25
F (0.0) if UEC < .25
If enabled, the unused ECC is appended to the symbol data according to
the ISO/IEC 15415 Symbol Quality Output Mode setting.
Serial Cmd: < K709, symbol contrast,print growth,axial non-uniformity, unused ecc >
Default: Disabled
Options: 0 = Disabled 1 = Enabled