Application tag commands – ThingMagic M5e-Compact User Manual
Page 122
Application Tag Commands
122
Command Set
Currently, only the first six bits of this field are used. A value of zero in each bit field keeps
the corresponding memory segment unlocked. To lock any of the Kill and Access
passwords or the EPC, temporarily or permanently, set the corresponding bit fields in the
Lock Bits word to 1. For additional information, refer to the Higgs Tags Application Notes
(Currently available at http://www.alientechnology.com/docs/
Load_Image_Application_Note_1.pdf - Contact Alien Technology for more details).
The PC Word field, in the table on the previous page, corresponds to the PC Word in the
Tag EPC memBank defined in the Gen2 Specification and is shown in the following table:
Alien Higgs PC Bits
The PC Word in the Write Tag Specific command allows you to specify the NSI Bits and
the length of the EPC that you want to write into the tag. The RFU bits are always zero
and the PC Bits are determined by the EPC length as specified in the Gen2 Specification
and the Higgs Tags Application Notes.
To use the extended format of the Gen2 Tag Specific command but keep the NSI bits
intact, set option=0x03. This signals the reader to ignore the NSI bits of the PC Word sent
to the reader along with the command.
In the example on the previous page, after the execution of the Gen2 Tag Specific
command, the reader writes the 96-bit EPC 0x112233445566778899AABBCC, the Kill
Default Values
X
X
X
X
X
X
X
X
X
X
Lock Values
X
X
X
X
X
X
X
X
X
X
5
4
3
2
1
0
APW
Lock
APW
P-lock
KPW
Lock
KPW
P-lock
EPC
Lock
EPC
P-
lock
0
0
0
0
0
0
1
1
1
1
1
1
Bit Number
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Field Name
PC Bits
RFU
RFU
NSI
Bits
Default Values
X
X
X
X
X
0
0
0
0
0
0
0
0
0
0
0