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5. SYSTEM MODE EO18-33027
5.11 RFID Module Setting
5-82
5.11.4.5 Write retry minimum AGC / WRITE RETRY MIN AGC
It is applicable for only B-SX704-RFID-U2-R/EU-R/US-R/US-R.
When the Q value is set to 1 or greater, the AGC threshold lower limit for retry becomes effective.
Even if a tag’s gain is lower than the AGC threshold for data write, a data write to the tag may be
successful in a retry if the gain is greater than the lower limit. For a retry, the printer lowers the
threshold to the highest gain of the tag if it is greater than the lower limit or to the lower limit if it is
greater than the highest gain of the tag.
Example 1
AGC threshold for data write: 11
Lower limit for retry: 9
Detected tag’s gain: 10
As the gain of the tag is lower than the threshold, a data write operation is not performed for this tag at
the first try. However, the gain is greater than the lower limit. Then the printer retires to write data to
this tag according to a new AGC threshold of 10. In this case, a retry of a data write will mostly succeed
because the detected tag’s gain is greater than the new threshold. (However, the success rate is not
100% because a gain of a tag is not always the same.)
Example 2
AGC threshold for data write: 11
Lower limit for retry: 9
Detected tag’s gain: 8
As the gain of the tag is lower than the threshold, a data write operation is not performed for this tag at
the first try. Also, the gain is lower than the lower limit. Then the printer retries to write data to this tag
according to a new AGC threshold of 9. In this case, a retry of data write will mostly fail because the
detected tag’s gain is lower than the new threshold. (However, the error rate is not 100% because a
gain of a tag is not always the same.)
When the same value is set to the AGC threshold for data write and the AGC threshold lower limit for
retry, respectively, the threshold will not be changed for a retry.
The optimum value differs depending on the tag type.
However, the problem that multiple tags are read at the same time does not occur on the B-EX series
with most RFID tag types. It is not necessary to change the default setting.
Max. Min. Step Display Sign Integer
digit
Decimal
point
digit
0 fullfil Unit
15 0 1 Decimal Non 2 0 Non Non