Command Identifier 0X40: Select Data Carrier (Select); Command Identifier 0X41: Unselect Data Carrier (Unselect) - Balluff BIS U-4A7-082-01C-07-S4 Betriebsanleitung

BIS U-4A7-082- _1C-07-S4
Industrial RFID system - Read/write head
8
System integration (continued)
8.7.4 Command identifier 0x40: Select data carrier
(Select)
The Select command can be used in multi-tag mode to
select a single data carrier within a data carrier population.
A data carrier that is located in the active read/write range
of the antenna is addressed and selected directly on the
basis of its EPC or TID and is then available for further
processing.
Command:
Subaddress Meaning
0x00 1st bit string
0x01 Command
recognition
0x02 Type EPC/
TID
0x03 Number of
bytes
0x04 Reserved
0x05 Reserved
0x06 Reserved
... None
0x1F 2nd bit
string
Data is accepted from the processor unit only after the
command has been accepted by the processor unit and
acknowledged.
Data:
Subaddress Meaning
0x00 1st bit string
0x01 Data
... Data
... None
0x1F 2nd bit
string
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Functional description
0x40: Select Tag (selection
of data carrier).
EPC = 0
TID = 1
Number of bytes of the
data carrier identifier (EPC
or TID) that are
transmitted in following
cycles.
Set to 0.
Set to 0.
Set to 0.
No meaning
If the 1st and 2nd bit
strings match, valid data is
present.
Functional description
1st byte of the data carrier
identifier (EPC or TID)
Other bytes of the data
carrier identifier (EPC or
TID)
No meaning
If the 1st and 2nd bit
strings match, valid data is
present.
8.7.5 Command identifier 0x41: Unselect data
carrier (Unselect)
The Unselect command can be used to cancel a data
carrier selection that was made with the Select command.
If no selection is active, the status remains unchanged.
Command:
Subaddress Meaning
0x00 1st bit string
0x01 Command
recognition
... None
0x1F 2nd bit
string
Input buffer: Status message
Response:
Subaddress Meaning
0x00 1st bit string
0x01 Status code
... None
0x1F 2nd bit
string
Functional description
0x41: Unselect (cancel
data carrier selection).
No meaning
If the 1st and 2nd bit
strings match, valid data is
present.
Functional description
Provides information
about the status of a
request.
No meaning
If the 1st and 2nd bit
strings match, valid data is
present.
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