turck BL IDENT, Quick Start Manual

Page: 25 / 48

D101925 0412 - BLident® UHF
3-3
Start-up with the BLxx-2RFID-S and BLcompact RFID electronic modules
Process output data
The following assignment of the 12 byte process output data (8 bytes of user data) is mapped by the
read/write head in the BLxx-2RFID-S module for channel 1 – channel 2 has the same assignment but has
a different start address for the process image:
Meaning of the command bits/control bits of the process output data
Note
The S module generates an error message if more than one command bit is set of TAG_ID,
READ, WRITE, XCVR_INFO or TAG_INFO! Bit XCVR must always be set for the execution of a
command in order for the read/write head to stay active!
During a read/write operation, the bits for Byte_Count, Domain_Count and the bytes for
AddrHi, AddrLo must always be set.
Attention
Possible damage to the data carriers!
Incorrect writing to the reserved area (bank address = 00) or to the first four bytes of the UII
memory (bank address = 01) of the data carrier memory may cause the data carrier to
permanently malfunction.
The following table shows the meaning of the command bits of the process output data shown in the
previous page:
TP
(Tag
present) 1 : A data carrier is in the sensing range of the read/write head and is detected by it.
0 : There is no data carrier in the sensing range of the read/write head or the read/write
head has not detected it.
ERROR_
CODE_
0...1
Representation of the error code - Array of length 2 bytes.
The error code 0202 is output when multiple data carriers are accessed.
READ_
DATA
Read data (can also have information from the data carrier and about the UHF radio
field) - Array of 8 bytes length.
Figure 5:
Process output data
Table 10: (cont.)
Meaning of the
status bits
Designat
ion Meaning
OUTPUT BYTE Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 XCVR NEXT TAG ID
[EPC/UII]
READ WRITE (Tag INFO) (XCVR Info) RESET
1 Reserved Reserved Domain
Count 1
Domain
Count 0
Reserved Byte
Count 2
Byte
Count 1
Byte
Count 0
2
3
4
5
6
7
8
9
10
11
Channel 1
Address high byte
WRITE DATA (8 Byte)
Address low byte