Toshiba B-EX Series Key Operation Specification page 154

8.12.4.2 Q VALUE
This is effective only for B-EX700-RFID-U2-EU/US-R, B-EX700-RFID-U4-R,
B-EX700-RFID-U4-EU/US-R, U4 module preinstall model (B-EX4T1/EX4T2-GS18/TS18-CN-R).
In the case multiple RFID tags are read at the same time, this menu is useful to focus on 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
retrying, too. Setting all these values enables writing data to a tag placed just above the antenna.
Actually, the problem of reading multiple tags at the same time does not occur with most RFID tag types.
It is not necessary to change the default setting of "0".
Max. Min. value
value
15 0
8.12.4.3 AGC THRESHOLD
This is effective only for B-EX700-RFID-U2-EU/US-R, B-EX700-RFID-U4-R,
B-EX700-RFID-U4-EU/US-R, U4 module preinstall model (B-EX4T1/EX4T2-GS18/TS18-CN-R).
When the obtained gain of an RFID tag is lower than the AGC threshold, the tag is considered as an
error one even if a data writing has succeeded.
When the AGC threshold is set to "0", all tags are writable.
When this parameter is set to "8", for example, tags with the AGC threshold level of 7 or less are
considered as error ones.
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 B-EX700-RFID-U2-EU/US-R, B-EX700-RFID-U4-R,
B-EX700-RFID-U4-EU/US-R, U4 module preinstall model (B-EX4T1/EX4T2-GS18/TS18-CN-R).
When the Q value is set to "1" or greater, the AGC threshold for data writing becomes effective.
When the obtained gain of an RFID tag is lower than the AGC threshold for data writing, no data writing
operation is performed. In other words, setting an AGC threshold for data writing 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 writing operation is performed regardless of the gain of a tag.
Both of the AGC threshold and the AGC threshold for data writing 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 writing
is effective a measurement is performed before data is written. And if a gain value is lower than the
threshold, no data writing operation is performed.
The optimum value differs depending on the tag type.
Actually, the problem of reading multiple tags at the same time does not occur with most RFID tag types.
It is not necessary to change the default setting.
Step Display
1 Decimal
Step Display
1 Decimal
149
Sign Integer Decimal
digit
None 2
Sign Integer Decimal
digit
None 2
0-padding
place measure
0 None
0-padding
place measure
0 None
Unit of
None
Unit of
None