Toshiba B-EX Series Key Operation Specification page 125

8.12.4.2 Q VALUE
This is effective only for the B-EX700-RFID-U2-R/EU-R/US-R/CN-R.
In the case multiple RFID tags are read at the same time, this menu is useful to pinpoint a target tag. Set
the Q value to "1! Or greater (2 is recommended) with the [UP] or [DOWN] key. Q value "0" causes the
tags to interfere with each other and disables proper data write.
When the Q value is set, set an AGC threshold for data write and an AGC threshold lower limit for retry,
also. Setting all these values enable writing data to a tag placed just above the antenna.
Max. Min. value
value
15 0
8.12.4.3 AGC THRESHOLD
This is effective only for the B-EX700-RFID-U2-R/EU-R/US-R/CN-R.
When the obtained gain of an RFID tag is lower than the AGC threshold, the tag is considered as an error
tag even if a data write succeeds.
When the AGC threshold is set to "0", all tags are writable.
When set to "8", for example, only tags with the AGC threshold level of 9 or greater are writable. The
optimum value is different depending on the tag types.
Max. Min. value
value
15 0
8.12.4.4 WRITE AGC THRESHOLD
This is effective only for the B-EX700-RFID-U2-R/EU-R/US-R/CN-R.
When the Q value is set to 1 or greater, the AGC threshold for data write becomes effective.
When the obtained gain of an RFID tag is lower than the AGC threshold for data write, a data write
operation is not performed. In other words, setting an AGC threshold for data write enables writing data
only to a tag placed just above the antenna.
Supposing that the gain of a tag just above the antenna is 14 and that of a tag off the antenna is 7, setting
the threshold to 11 (a value between 8 and 14) enables the printer to write data only to the tag just above
the antenna.
When the threshold is set to 0, a data write operation is performed regardless of the gain of a tag.
Both of the AGC threshold and the AGC threshold for data write are used to determine whether a tag is
defective or not, but the timing of a gain measurement is different. In the case of the AGC threshold, this
is performed after data is written to a tag.
On the contrary, when the AGC threshold for data write is effective a measurement is performed before
data is written. And if a gain value is lower than the threshold, a data write operation is not performed.
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. value
value
15 0
Step Display
1 Decimal
Step Display
1 Decimal
Step Display
1 Decimal
Sign Integer
digit
None 2
Sign Integer
digit
None 2
Sign Integer
digit
None 2
120
Decimal 0-padding
place
0 None
Decimal 0-padding
place
0 None
Decimal 0-padding
place
0 None
Unit of
measure
None
Unit of
measure
None
Unit of
measure
None