C
HAPTER
5
T
AG
P
ROGRAMMING
R
EADER
I
NTERFACE
G
UIDE
D
OC
. C
ONTROL
# 8101938-000 R
EV
05
87
The Lock Tag command takes one argument: the PassCode, which is a
hexadecimal byte in the range
00-FF
. If the PassCode is not supplied, the
reader uses
00
be default. This PassCode is required by the Kill command, as
described below.
Lock Tag Examples
Condition Exactly one tag in field of view. Tag read is strong.
Lock tag with pass code of 5F.
Command
Response
>lock tag = 5F
Lock Tag = Success!
Condition Tag on fringe of read range, or no valid tags in range
Command
Response
>lock tag = 5F
Lock Tag = Error : No Tag Found.
Condition Tag is already Locked
Command
Response
>lock tag = 5F
Lock Tag = Error : Tag Is Locked.
Kill Tag
9800 | 9780 | 8780 | 9640 | 9774
The Kill Tag command is used to recover a locked tag, allowing it to be
programmed again. A locked tag cannot be erased or reprogrammed; the only
programming operation that can be performed on a locked tag is the Kill Tag
operation.
Kill Tag sets all bytes of tag memory to zero.
Kill Tag can only be used on locked tags.
There is no "unlock" command.
To use the Kill Tag command, the full tag ID of the tag to kill must be provided as
well as the PassCode that was used to lock the tag with. These parameters are
passed as 9 or 13 (depending on tag type) consecutive hexadecimal numbers
separated by spaces.
Kill Examples
Condition Exactly one tag in field of view. Tag read is strong.
Tag ID is 80 00 01 00 02 00 03 00. Locked using pass code 5F.
Kill Tag command is successful.
Command
Response
>kill tag = 80 00 01 00 02 00 03 00 5F
Kill Tag = Success!
Condition Exactly one tag in field of view. Tag read is strong.
Tag ID is 80 00 01 00 02 00 03 00. Locked using pass code 5F.
Kill Tag command fails because PassCode is wrong.
Command
Response
>kill tag = 80 00 01 00 02 00 03 00 1A
Kill Tag = Error : Kill Failure.
Once a tag is killed, its memory contents (including CRC bytes) are cleared to all
zeros, making the tag unreadable. It may then be reprogrammed with a new ID.
Summary of Contents for ALR-8780
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