Intermec 4630 User Manual page 160

4630 and 4830 Bar Code Label Printers User's Manual
Selecting an Error Correction Level
The level of error correction that works best for your data depends on the
amount of characters in your symbols. If you decide to select your own error
correction level, you need to estimate the number of characters since they are
formed by compressing the raw data you send to the printer. In general, 1.8
alphanumeric characters generate one symbol character. If you are using
numeric data, 2.9 digits generate one data symbol character.
Intermec recommends that you leave the error correction level at the default
setting of 9. This setting lets the printer select a level, between level 2 and level
5, that provides the most efficient error correction of your data. The printer
bases the level selection on the number of symbol characters your data
generates.
The following table shows the m2 values (error correction levels), the
recommended data amount that you should use for each level, and the number
of error correction characters the level generates.
,m2
*
†
‡
Setting the Truncate Flag
The truncate flag determines if the symbol is printed in truncated form. A
trucated symbol prints without right row indicators and with only a one-
module wide stop character. To minimize errors and maintain the best reading
performance, Intermec recommends that ,m3 be set to 0.
6-44
Recommended
Data Amount
0 *
1 *
2 1 - 40
3 41 - 160
4 161 - 320
5 321 - 863
6 †
7 †
8 †
9 ‡
You should only use ,m2 values of 0 and 1 if your labels do not have
enough space for more error correction characters. These values are
generally not recommended.
The printer reserves ,m2 values of 6, 7, and 8 for special applications where
the symbol is subject to damage and requires a higher level of error
correction.
An ,m2 value of 9 lets the printer set m2 to the recommended value for each
symbol based on the number of characters. An m2 value of 9 is the default
setting.
Error Detection
Characters
2 (error detected, no recovery)
4
8
16
32
64
128
256
512