ThingMagic M5e-Compact - Manual (Page 107)

Application Tag Commands
Command Set 107
Read Tag Data (28h)
For the deprecated version of this command see Appendix D: Read Tag Data (28h) .
The Read Tag Data command reads the specified memory bank at data address location
within that memory bank of a tag. The tag which will be read can be specified using the
Tag Singulation Fields or, if Option=0x00 of the Tag Singulation Fields is specified, it will
attempt to read from the first tag it finds. If no tag is in the field, the memory location
doesn’t exist or is read locked, or the Select criteria cannot be satisfied a fault code is
returned.
In addition to the Tag Singulation Fields the Read Tag Data command takes several fields
which specify the data which will be read from the tag. These fields are:
Read Tag Data Fields
The Basic syntax which returns only the requested Tag Data is defined in Get Tag Data .
With additional Option bits set, Read Tag Data can also return Tag Read Meta Data using
the syntax in Get Tag Data and Meta Data .
Field Value Description
Read MemBank 1 byte The MemBank field specifies which of the tag’s memory banks
the data is to be read from. The values correspond to the
Memory Bank values as specified in the
Gen2 specification.
They are:
0x00 = Reserved
0x01 = EPC
0x02= TID
0x03 = User Memory
Read Address 4 bytes The Address field is the offset in the specified Memory Bank,
in 16-bit words, to start reading from. It corresponds to the
WordPtr argument in the Gen2 specification.
Note: Addresses are always zero-based. Specifying 0x00
indicates starting at the first address location.
WordCount 1 byte The number of words (16 bit chunks) of data to read from
memory bank [MemBank] starting at offset [ReadAddress].
Access Pass-
word 4 byes The Access Password for the tag, if the tag is read locked. For
an unlocked tag AccessPwd=0x00000000.