Command Identifier 0X47: Detect And Read Data Carriers (Get Taglist) - 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)
8.7.9 Command identifier 0x47: Detect and read
data carriers (Get Taglist)
Reading out the EPC or the TID, depending on the type
configured, of all data carriers located in the active read/
write range of the antenna.
Command:
Subaddress Meaning
0x00 1st bit string
0x01 Command
recognition
0x02 Type
0x03 Max.
number of
data carriers
0x04 Data carrier
selection
... None
0x1F 2nd bit
string
If the EPCs are transmitted with the length 12 bytes, the
response in the input buffer looks as follows:
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Functional description
0x47: Detect and read
data carriers
EPC (0) or TID (1)
Maximum number of data
carriers to be output
1...255,
(0 = no limitation).
If the specification is
greater than the maximum
specification of the
connected head, the
lower value applies.
All = 0/Selected = 1
No meaning
If the 1st and 2nd bit
strings match, valid data is
present.
Response:
Subaddress Meaning
0x00 1st bit string
0x01 Number of
tags
0x02 Number of
bytes per
EPC
0x03 EPC 1
... ...
... EPC 1
... EPC 2
... ...
EPC 2
... ...
... EPC n
... ...
EPC n
0x1F 2nd bit
string
If necessary, the data must be transmitted in
several BUS cycles.
Example
Example of a received data frame with 2 EPCs and
12 bytes per EPC (display without bit strings):
EPC 1
E2 FF 00 00 E2 11
EPC 2
E2 00 90 51 32 05
Data
000000: 02 0c 27 01 03 e2 22 90 11 e2 00 00 ff e2 be c5
000010: 80 07 74 01 05 32 51 90 00 e2
Functional description
12
This corresponds to the
length of the longest
transmitted EPC
configured in the device.
EPCs shorter than this
length are output right-
justified and filled with
zeros on the left.
In the following, the
(number of data carriers
read) × (number of bytes
per EPC) are transmitted.
For 64 bytes per EPC, the
actual EPC length in ASCII
is specified in the 1st and
2nd byte of the EPC.
EPC data highest address
...
EPC data lowest address
EPC data highest address
...
EPC data lowest address
...
EPC data highest address
...
EPC data lowest address
If the 1st and 2nd bit
strings match, valid data is
present.
90 22 E2 03 01 27
01 74 07 80 C5 BE
english 51