Datasheet

TNF: Type Name Format Field

The Type Name Format or TNF Field of an NDEF record is a 3-bit value that describes the record type, and sets the

expectation for the structure and content of the rest of the record. Possible record type names include:

IL: ID LENGTH Field

The IL flag indicates if the ID Length Field is preent or not. If this is set to 0, then the ID Length Field is ommitted in the

record.

SR: Short Record Bit

The SR flag is set to one if the PAYLOAD LENGTH field is 1 byte (8 bits/0-255) or less. This allows for more compact

records.

CF: Chunk Flag

The CF flag indicates if this is the first record chunk or a middle record chunk.

ME: Message End

The ME flag indicates if this is the last record in the message.MB: Message BeginThe MB flag indicates if this is the

start of an NDEF message.

Type Length

Indicates the length (in bytes) of the Record Type field. This value is always zero for certain types of records defined

with the TNF Field described above.

TNF Value Record Type

--------- -----------------------------------------

0x00 Empty Record

Indicates no type, id, or payload is associated with this NDEF Record.

This record type is useful on newly formatted cards since every NDEF tag

must have at least one NDEF Record.

0x01 Well-Known Record

Indicates the type field uses the RTD type name format. This type name is used

to stored any record defined by a Record Type Definition (RTD), such as storing

RTD Text, RTD URIs, etc., and is one of the mostly frequently used and useful

record types.

0x02 MIME Media Record

Indicates the payload is an intermediate or final chunk of a chunked NDEF Record

0x03 Absolute URI Record

Indicates the type field contains a value that follows the absolute-URI BNF

construct defined by RFC 3986

0x04 External Record

Indicates the type field contains a value that follows the RTD external

name specification

0x05 Unknown Record

Indicates the payload type is unknown

0x06 Unchanged Record

Indicates the payload is an intermediate or final chunk of a chunked NDEF Record