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NFC Forumの3本の流れ

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R/Wモード

Reader / Writerモードのこと。
自分が搬送波を出す側になり、タグにアクセスする。
用語でいえば、自分がInitiatorになる、ということ。

Card Emulationモード

自分がタグになりすます。
用語でいえば、自分がTargetになる、ということ。
Card Emulationモードになってるときは、R/Wからの指示を待つ。

P2Pモード

Peer to Peerモードのこと。
R/Wモード、Card Emulationモードは「NRM」(Normal Response Mode)と呼ばれ、Initiatorが要求を出し、Targetが応答を返す、という形を取る。
P2Pモードの場合は「ABM」(Asynchronous Balanced Mode)と呼ばれ、InitiatorでもTargetでも要求が出せるようになっている。

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