User's Manual

MP9310 User’s Guide
34
Programming the ISO18000-6B Tag
General ISO18000-6B Programming
In ISO18000-6B, operations are controlled by a state machine within the tag. As a
result, the tag must be in the Data Exchange state for the write operation to
succeed. To guarantee the tag is in that state, the tag must be reset using the Tag
Reset Tr command followed by a Read Detect Rd command prior to performing
the first write operation.
The ISO18000-6B protocol does not provide any feedback on the write operation
since the reader always provides an Ack ({A) after the tag receives a command.
The only way to verify success is to read the data back from the tag.
An ISO18000-6B tag write operation can fail if any byte within the addressed
range is locked or if the power setting is not correct. It is not uncommon for
Philips and Rafsec ISO18000-6B tags to have some of the first eight bytes locked.
Confirm the status of the specific type of tag in use.
Both the Wa and Wt command can be used with the ISO18000-B tag. The Wt
command is used to modify data outside of the first 8 bytes in the tag and requires
specification of the tag ID using the d:parameter.
The following parameters are used with the Wa or Wt commands.
• a: address block. In ISO18000-6B, this parameter provides the address of the
writeable memory block. The block size is one byte.
• l: length. This parameter reflects the number of blocks being written (which
is equal to the number of bytes in this case).
• b: write data. This parameter contains the actual data being written.
The following command example command writes AABBCCDD to user memory at
address 0x20 on a tag with ID EF04001122334455:
}wt,d:EF04001122334455,a:20,b:AABBCCDD,l:4!
In addition to the Wa and Wt commands, SAMSys readers also support the
following ISO18000-6B operations:
• Lb Lock Block
• Yl Query Lock Status (returns
f:0 for unlocked or f:1 for locked)
Each of these operations must specify a particular tag ID with the d: parameter
and block address with the a: parameter.