54 of 135
2.4.6 EPC Word Length
You can increase communication precision by setting the EPC word length of a tag to be read. The length
shall be set with “0” as an auto mode or a number from 1 to 32 as fixed length mode. Default value is “0”
(auto mode).
z
For fixed length mode, set a total number of tag’s PC length (constantly 1) and EPC word length.
Value
Description
0
(auto mode)
R/W measures the EPC word length of the tag automatically
and sets the most suitable value. Generally, use this mode.
1 to 32
(fixed length mode)
R/W communicates with the tag depending on the set value.
If you have a word length of the tag to be read before hand,
use this mode.
The value must be the greatest of the EPC word lengths of
the tags to be read.
Ex1) When EPC word length of a communicating tag is unknown set EPC word length to “0” (auto mode).
[Tx] SETC ewl=0
[Rx] SETC0000
Ex2
)
When EPC word length of a communicating tag is known beforehand, set the word length.
For example, set it as follows when all EPC length of a communicating tag are 96bit (6 words).
[Tx] SETC ewl=7
[Rx] SETC0000
If the number of tags to be read is two or more and each tag has different EPC length, set the greatest
number of the EPC word lengths of them.
[Note] If you set the smaller value than the actual EPC word length, communication precision may be
decreased.
Tag A
EPC=6 words
Tag B
EPC=10 words
Tag C
EPC=4 words
[Tx] SETC ewl=11
[Rx] SETC0000
Set it to 11 (PC 1 word and EPC 10 words)