User Guide

Table Of Contents
Gen2 Tag Commands
104
Read Tag Data (28h)
The following fields apply to all the specified commands. Please check each command for
exact order, and any exceptions, as they may not all correspond with the order below.
Tag Singulation Fields
Field Values Description
Select Option 0x00 Select functionality is disabled. First tag found will be the tag
operated on. No other Tag Singulation Fields should be
specified. Option field must always be specified.
0x01 Select on the value of the EPC. Requires all fields except
the Select Address field.
0x02 Select on contents of TID memory bank (Gen2 bank 0x02).
Requires all fields.
0x03 Select on contents of User Memory memory bank (Gen2
bank 0x03). Requires all fields.
0x04 Select on contents of the EPC memory bank (Gen2 bank
0x01). Requires all fields.
0x08 Sets Invert Flag. This results in tags NOT matching the
specified Tag Singulation Fields will be returned, as defined
in Select Algorithm and Parameters.
Select Address 4 bytes Contains the offset, in bits, within the memory bank, speci-
fied by the Option value, at which the comparison is to start.
NOTE: specifying Option=0x04 and Select Address=0x20 is
the equivalent, for Gen2 v1 tags, of specifying Option=0x01,
both specify a comparison against the tag EPC ID data.
Note: Addresses are always zero-based. Specifying
0x00 indicates starting at the first address
location.
Select Data Length 1 byte Contains the length of the data (Select Data) to be com-
pared, in bits, to the EPC when Option=0x01, or to the data
beginning at Select Address for other options.
Select Data M bytes Contains the data to be compared against the specified tag
data (memory bank and address, or EPC as specified by the
Option value)