Texas Instruments HFDEMOKITII Manuale Utente

Standard reader Request Packet Format (See Section 3.1)

ISO Command

Data

Header

Packet
Length

Node

Address

Command

Flag

Command

Config.

Byte

Data

Checksum

Byte 0

bytes

1 - n

1 byte

2 bytes

2 bytes

1 byte

1 byte

1 byte

n

bytes

2 bytes

Header

1 byte

Defines the start of the packet (01

hex

).

Packet Length

2 bytes

Defines the length of the packet, including checksum.

Node Address

2 bytes

Defines the Node address of the reader.

Command Flags

1 byte

Defines how a command will be executed.

Command

1 byte

Defines the command for the reader to execute (60

hex 

for

ISO 15693-3 commands)

Data

0 - n
bytes

Defines the data required by the reader for a command.

Checksum

2 bytes

Byte 1 is an XOR checksum of all elements from the
header to the last byte

Similar to the request packet, the response packet consists of the header, packet length, node
address, command flags, reader command (60

hex

), ISO/IEC 15693-3 command/data bytes 0 to

some number “m” and the checksum.

The ISO Response Data packet can come in one of two possible generic formats: (a) One for
the ISO Inventory Response, and (b) all other ISO responses.  These will be highlighted in the
following sections.

With the exception of the ISO Inventory Response packet, the format
for each standard response packet is the same.

There are three possible reader errors that can be generated in response to an ISO 15693
command.  This error code will be returned within the Error Byte (Byte 0) of the ISO
Response Data.  The error codes are as follows:

Transponder not found

Command not supported

Invalid flags