INfinity 510 Protocol Reference Guide - Sirit

Chapter 4 – Reader Behavior
Lock and Unlock Tags
As described previously, the reader can lock portions of the tag memory
space while writing them. However, the reader can also change the lock
state without first performing a write. In this case, the tag.lock*
function are used. As described in the Read Tags and Write Tags sections,
there are specific functions used to lock or unlock individual sections of a
tag’s memory space and a general function used to lock or unlock multiple
sections.
The following functions are used to lock, unlock, perma-lock or permaunlock
a specific portion of a tag’s memory space.
tag.lock_id() - Changes lock state of the Tag ID or EPC of the tag.
tag.lock_tid() - Change lock state of the TID of the tag.
tag.lock_user_data() - Change lock state of the tag’s user data.
tag.lock_access_pwd() - Change lock state of the tag’s access
password.
tag.lock_kill_pwd() - Change lock state of the tag’s kill
password.
Each function uses the following arguments:
• lock_type – Can be either SECURED, UNSECURED,
PERMA_LOCKED, or PERMA_UNSECURED.
• tag_id - Optional parameter specifying the tag to lock.
• pwd - Optional parameter supplying the password required to
change the tag’s lock state.
• antenna - Optional parameter specifying which antenna(s) to use
for the command. If antenna is not specified, all currently enabled
antennas are used.
In addition to the specific tag lock functions, there is a general
tag.lock() function that uses the lock_fields parameter. This
parameter describes which fields will change lock state. This parameter is
a string containing one or more of the following letters:
• k - kill password
• a - access password
• e - EPC
• t - TID
• u - user data
One additional function, tag.unlock(), is used to explicitly unlock
portions of a tag’s memory space. This function takes the same parameters
as tag.lock() except that lock_type is not specified (assumes
UNSECURED) and unlock_fields is used instead of lock_fields.
28 INfinity 510 Protocol Reference Guide