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Luo","content":[{"type":"p","children":[{"text":"如果你用過『悠遊卡』、『一卡通』搭乘過捷運或公車，其實你應該已經熟悉NFC的使用方式。在《NFC說文解字》篇裡，已經提過NFC基本的三種運作模式，而其中最簡單與常用的就是所謂的『主動模式：NFC設備可作為一個讀寫器(Reader)，可以主動發出電磁場去識別與讀/寫其他的NFC設備或標籤(Tag)；』，也就是說，在應用情境裡，用Reader來識別Tag的身份，並存取其內的資料。","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"在“感應票卡搭乘捷運”的情境裡，閘口的感應區裡就有Reader，乘客手中的『悠遊卡』就是Tag，當乘客將卡靠近時，Reader就能識別悠遊卡並做扣款註記；","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"又譬如：玩任天堂的SWITCH，在“動物之森”的遊戲裡，使用手把上的Reader來感應某個藏在動物公仔底部的標籤Tag，就可以邀請該動物到目前的遊戲裡作客；","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"所以當使用情境中的Reader角色，換成你手中的NFC手機時，就可以存取感應標籤裡的資訊。而這感應標籤的形式，可以是一張貼紙或是植入在物件內的Tag，因為這個Tag不需要帶電源，所以萬物可為，就可以有無限的想像。但請記住，剛才的應用情境裡，其實有兩個要點：其一是Tag的身分識別，再者是Tag的記憶體存取。","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"首先，要談『Tag的身分識別』。這裡的Reader是個主動設備，可以建立一個頻率為13.56MHz的無線射頻感應場，只要有符合NFC協會規範的各型Tag進入場中，就可以透過Tag的天線來感應生電來啟動晶片，並進入等待狀態；Reader為了識別是何型的Tag在場中，會以輪詢可支援的通訊協定來做輪詢(Polling)，發出REQ的探詢命令；一旦有Tag回應了這個命令，便有後續一連串取得Tag唯一識別碼(UID)、讀取其CC(Capability Container)容量資訊，或進一步解析NDEF內涵等動作。","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"基本上，Android 與 iOS 的手機對NFC Tag的作為，大致上依照上面相同程序來進行；但就支援的API函式庫的用語、還有表現上還是有其差異性。在Android會使用“TagTechnology”來表示識別到的Tag型態，包括：IsoDep, MifareClassic, MifareUltralight, Ndef, NdefFormatable, NfcA, NfcB, NfcBarcode, NfcF, NfcV等；而iOS則以“TagType: Protocol”來傳送，包括：NFCISO15693Tag, NFCISO7816Tag, NFCFeliCaTag, NFCMiFareTag, NFCNDEFTag 等。請參考下圖的對照表。","fontSize":16,"lineHeight":1.8},{"type":"a","href":"https://nfctogo-revtel2-com-prod.s3.ap-northeast-1.amazonaws.com/NFC Tag Info-231230-1 -1703904820","children":[{"text":"","fontSize":16,"lineHeight":1.8},{"type":"img","src":"https://nfctogo-revtel2-com-prod.s3.ap-northeast-1.amazonaws.com/NFC Tag Info-231230-1 -1703904820","children":[{"text":""}],"maxWidth":"100%","width":"100%","hypeLinkUrl":"https://nfctogo-revtel2-com-prod.s3.ap-northeast-1.amazonaws.com/NFC Tag Info-231230-1 -1703904820"},{"text":""}]},{"text":""},{"type":"a","href":"https://nfctogo-revtel2-com-prod.s3.ap-northeast-1.amazonaws.com/NFC Tag Info-231230-1 -1703904820","children":[{"text":""}]},{"text":"特別要一提的是在手機解鎖狀態下，都可以支援所謂的“Background Tag Reading”，就是可以不經特定的APP，直接在幕後讀取Tag的NDEF內涵，然後進行其指定的相關動作。也就是說，如果是ㄧ個空白的Tag，就必須用APP來啟動Reader模式，來指定某個協定或安排輪詢的方式進行Tag的存取。","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"","fontSize":16,"lineHeight":1.8}]},{"type":"p","children":[{"text":"當然，不同類型的Tag存取的命令與格式都會有不同，但基本上都可以下達Transceive的方式進行，細節請直接參考各平台的程式庫說明：","fontSize":16,"lineHeight":1.8},{"type":"a","href":"https://developer.android.com/reference/android/nfc/tech/package-summary","children":[{"fontSize":16,"lineHeight":1.8,"text":"Android"}]},{"fontSize":16,"lineHeight":1.8,"text":" | "},{"type":"a","href":"https://developer.apple.com/documentation/corenfc/nfctagreadersession","children":[{"fontSize":16,"lineHeight":1.8,"text":"iOS"}]},{"fontSize":16,"lineHeight":1.8,"text":" 。"}]}],"html":"

如果你用過『悠遊卡』、『一卡通』搭乘過捷運或公車，其實你應該已經熟悉NFC的使用方式。在《NFC說文解字》篇裡，已經提過NFC基本的三種運作模式，而其中最簡單與常用的就是所謂的『主動模式：NFC設備可作為一個讀寫器(Reader)，可以主動發出電磁場去識別與讀/寫其他的NFC設備或標籤(Tag)；』，也就是說，在應用情境裡，用Reader來識別Tag的身份，並存取其內的資料。

在“感應票卡搭乘捷運”的情境裡，閘口的感應區裡就有Reader，乘客手中的『悠遊卡』就是Tag，當乘客將卡靠近時，Reader就能識別悠遊卡並做扣款註記；

又譬如：玩任天堂的SWITCH，在“動物之森”的遊戲裡，使用手把上的Reader來感應某個藏在動物公仔底部的標籤Tag，就可以邀請該動物到目前的遊戲裡作客；

所以當使用情境中的Reader角色，換成你手中的NFC手機時，就可以存取感應標籤裡的資訊。而這感應標籤的形式，可以是一張貼紙或是植入在物件內的Tag，因為這個Tag不需要帶電源，所以萬物可為，就可以有無限的想像。但請記住，剛才的應用情境裡，其實有兩個要點：其一是Tag的身分識別，再者是Tag的記憶體存取。

首先，要談『Tag的身分識別』。這裡的Reader是個主動設備，可以建立一個頻率為13.56MHz的無線射頻感應場，只要有符合NFC協會規範的各型Tag進入場中，就可以透過Tag的天線來感應生電來啟動晶片，並進入等待狀態；Reader為了識別是何型的Tag在場中，會以輪詢可支援的通訊協定來做輪詢(Polling)，發出REQ的探詢命令；一旦有Tag回應了這個命令，便有後續一連串取得Tag唯一識別碼(UID)、讀取其CC(Capability Container)容量資訊，或進一步解析NDEF內涵等動作。

基本上，Android 與 iOS 的手機對NFC Tag的作為，大致上依照上面相同程序來進行；但就支援的API函式庫的用語、還有表現上還是有其差異性。在Android會使用“TagTechnology”來表示識別到的Tag型態，包括：IsoDep, MifareClassic, MifareUltralight, Ndef, NdefFormatable, NfcA, NfcB, NfcBarcode, NfcF, NfcV等；而iOS則以“TagType: Protocol”來傳送，包括：NFCISO15693Tag, NFCISO7816Tag, NFCFeliCaTag, NFCMiFareTag, NFCNDEFTag 等。請參考下圖的對照表。\"article特別要一提的是在手機解鎖狀態下，都可以支援所謂的“Background Tag Reading”，就是可以不經特定的APP，直接在幕後讀取Tag的NDEF內涵，然後進行其指定的相關動作。也就是說，如果是ㄧ個空白的Tag，就必須用APP來啟動Reader模式，來指定某個協定或安排輪詢的方式進行Tag的存取。

當然，不同類型的Tag存取的命令與格式都會有不同，但基本上都可以下達Transceive的方式進行，細節請直接參考各平台的程式庫說明：Android | iOS 。

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