User's Manual

UHF RFID Reader UR - SERIES User Manual v1.14
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8.2.9 Read protection configuration (Without EPC number)
The function of this command is to setup read protection for tags within the effective field. Unlike
the pervious command in chapter 8.2.8, this command will perform operation on multiple inquired
tags without tag identification. In order to perform operation on multiple tags, it is vital to keep
access password consistent on those tags. This command only valid for NXP UCODE EPC G2X
tags.
Command frame:
Len
Adr
Cmd
Data[]
CRC-16
Pwd
0x08
0xXX
0x09
4Byte
LSB
MSB
Parameter definition
Pwd: 4 bytes, it is the 4 bytes access password of a tag. From left to right, the first two bytes are the
high bytes of access password, and the last two bytes are the low bytes. The most-significant bit of a
tag 32-bit access password is the most-significant bit in the 1st byte of Pwd (from left to right).
Likewise, the least-significant bit of a tag 32-bit access password is the least-significant bit in the
4th (last) byte of Pwd. It is not possible to setup the read protection status if the tag has all-zero
access password, hence reader will return a parameter error status in the response frame if zeros or
incorrect access password are delivered in this field.
Response frame:
Len
Adr
reCmd
Status
Data[]
CRC-16
0x05
0xXX
0x09
0x00
——
LSB
MSB
8.2.10 Unlock read protection
The function of this command is to unlock read protection of a tag. Only one tag is allowed to be
place in the antenna effective area. This command only valid for NXP UCODE EPC G2X tags.
Command frame:
Len
Adr
Cmd
Data[]
CRC-16
Pwd
0x08
0xXX
0x0a
4Byte
LSB
MSB
Parameter definition
Pwd: 4 bytes, it is the 4 bytes access password of a tag. From left to right, the first two bytes are the
high bytes of access password, and the last two bytes are the low bytes. The most-significant bit of a
tag 32-bit access password is the most-significant bit in the 1st byte of Pwd (from left to right).
Likewise, the least-significant bit of a tag 32-bit access password is the least-significant bit in the
4th (last) byte of Pwd. It is essential to provide a correct access password in this command, reader
will return a parameter error status in the response frame if incorrect access password is delivered in
this field.