MB89R112 datasheet(11/49 Pages) RAMXEED

11 / 49 page

MB89R112

DS411-00004-3v0-E

4. Requests/Responses

A request is sent from the reader/writer to the transponder. In replying to the request, the transponder sends

a response to the reader/writer.

Each request, and response, is transmitted in each single frame.



Structure of requests and responses

A request consists of the following 5 fields :

• Flag

• Command code

• Parameter (required or optional depending on the command)

• Application data

• CRC

A response consists of the following 4 fields :

• Flag

• Parameter (required or optional depending on the command)

• Application data

• CRC

Each byte is transferred, beginning with the lowest bit. When two or more bytes are transferred, transfer

begins with the lowest one.

5. Operating Modes

The MB89R112 has the following 3 operating modes :

Each mode specifies a different mechanism for how the transponder returns a response in replying to a

request from the reader/writer :



Addressed mode

The MB89R112 enters Addressed mode when the Address_flag is set to “1”.

In Addressed mode, a request includes a UID (the Address_flag is set to “1” simultaneously), and only the

transponder that matches the UID in the request returns a response. If no transponder that matches the UID

exists, a response is not returned.



Non-Addressed mode

The MB89R112 enters Non-Addressed mode when the Address_flag is set to “0”.

In Non-Addressed mode, a request does not include a UID. The transponders that receive the request

execute processing and return its response in accordance with the requested command.



Select mode

The MB89R112 enters Select mode when the Select_flag is set to “1”, and the Address_flag is set to “0”.

In Select mode, the request shall not contain a UID. When the transponders receive the command, only the

transponder in the select state executes processing and returns its response in accordance with the request-

ed command.

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