Thingmagic M5e-Compact Manual do Utilizador descarregar pdf (Página 81)

Application Tag Commands

Command Set 81

Example:

The following EPC IDs (first 3 bits) are in the field:

0xAAAA (101)

0xCCCC (110)

0x4444 (010)

0x3000 (001)

Select Option = 0x04 (EPC Mem Bank)

Select Data Length = 0x01 (1 bit)

Select Data = 0x80

Select Data Address = 0x00000022 (third bit in the EPC ID)

In this case the third bit of the EPC ID is matched against the first bit of the Select

Data value, 1. This would result in the following IDs being returned:

0xAAAA

0x3000

The Select Options field is typically followed by command specific fields. After the command specific fields the fol-

lowing Tag Singulation fields should be specified as appropriate for the Select Contents specified.

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

(2 bytes if Extended

Data enabled)

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)

The bit values used start at address 0. So if Select Data

Length = 2, i.e. matching 2 bits, then the bits used for com-

parision will be the 2 most significant bits of the Select Data

value. Examples:

Select Data = 0x00 the bits to match will be 0, 0

Select Data = 0x8F the bits to match will be 1, 0

This is independent of the Select Data Address field.

Note: 1- The Select Options field contains multiple sub fields which must be combined into a single Select Options

value. This means the final Select Options value is a result of Select Invert + Select Contents.

Field Values Description

1 2 ... 76 77 78 79 80 81 82 83 84 85 86 ... 251 252

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