Balluff BIS U-4A7-082-01C-07-S4 Betriebsanleitung Seite 136

BIS U-4A7-082- _1C-07-S4
Industrial RFID system - Read/write head
8
System integration (continued)
If the EPCs are transmitted with the length 64 bytes, the
response in the input buffer looks as follows:
Subaddress Meaning
0x00 1st bit string
0x01 Number of
tags
0x02 Number of
bytes per
EPC
0x03 EPC 1
length
0x04 EPC 1
length
0x05 EPC 1
... ...
... EPC 1
EPC 2
length
EPC 2
length
... EPC 2
... ...
EPC 2
EPC n
length
EPC n
length
... ...
... EPC n
... ...
EPC n
0x1F 2nd bit
string
If necessary, the data must be transmitted in
several BUS cycles.
52 english
Functional description
64
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.
MSB length (ASCII)
LSB length (ASCII)
EPC data highest address
...
EPC data lowest address
MSB length (ASCII)
LSB length (ASCII)
EPC data highest address
...
EPC data lowest address
MSB length (ASCII)
LSB length (ASCII)
...
EPC data highest address
...
EPC data lowest address
If the 1st and 2nd bit
strings match, valid data is
present.
Example
Example with 32 bytes of process data of a received data
frame with two EPCs and 64 bytes per EPC (display
without bit strings):
EPC 1
Length: 48 bytes (0x34 0x38)
EPC:
E2 FF 00 00 E2 11 90 22 E2 03 01 27 33 44 55 66
77 88 99 AC 01 02 03 04 05 06 07 08 09 0A 0B 0C
00 00 00 00 00 00 00 00 00 00 00 00 00 00 AA BB
EPC 2
Length: 12 bytes (0x31 0x32)
EPC:
E2 00 90 51 32 05
Data
000000: 02 40 34 38 00 00 00 00 00 00 00 00 00 00 00 00
000010: 00 00 bb aa 00 00 00 00 00 00 00 00 00 00 00 00
000020: 00 00 0c 0b 0a 09 08 07 06 05 04 03 02 01 ac 99
000030: 88 77 66 55 44 33 27 01 03 e2 22 90 11 e2 00 00
000040: ff e2 31 32 00 00 00 00 00 00 00 00 00 00 00 00
000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
000070: 00 00 00 00 00 00 be c5 80 07 74 01 05 32 51 90
000080: 00 e2
In total, 130 bytes are transferred here in five frames (four
frames with 30 bytes of useful data each and one frame
with ten bytes of useful data). Each frame also contains the
two bit strings.
01 74 07 80 C5 BE