rfid應(yīng)用開發(fā)實務(wù)簡介(參考版)
2024-10-11 14:55本頁面
【正文】 t send back a one to go back to sleep until later. The reader keeps eliminating tags until it finds the one with the highest serial number. Then, it wakes up the other tags and goes through the process again. This happens so quickly that it appears as though the tags are being read simultaneously. The protocol works on up to 16 million tags. RFID 應(yīng)用開發(fā)實務(wù)導(dǎo)論 2022/10/23 49 RFID 應(yīng)用系統(tǒng)架構(gòu)及功能 ? 系統(tǒng)架構(gòu)及功能說明 標(biāo)籤 讀取器 天線 中介軟體 應(yīng)用系統(tǒng) 標(biāo)籤資訊 無線電波 標(biāo)籤微波信號 資料封包 標(biāo)籤編碼 系統(tǒng)架構(gòu)與功能流程 RFID 應(yīng)用開發(fā)實務(wù)導(dǎo)論 2022/10/23 50 RFID的研究可區(qū)分成三大類 ? 第一類主要在於 RFID硬體的研發(fā)：其目的在於降低成本（尤其標(biāo)籤價格）、克服環(huán)境影響增加通信距離 ? 第二類則致力於中介軟體 (Middleware)的開發(fā)：中介軟體扮演讀取器解碼所得標(biāo)籤相關(guān)資訊與後續(xù)應(yīng)用系統(tǒng)的溝通橋樑 ? 最後一類就是 RFID技術(shù)於產(chǎn)業(yè)應(yīng)用系統(tǒng)開發(fā)：目前國內(nèi)政府方面有經(jīng)濟(jì)部與工研院合作，推廣 RFID資訊與市場應(yīng)用 RFID 應(yīng)用開發(fā)實務(wù)導(dǎo)論 2022/10/23 51 RFID 應(yīng)用開發(fā)實務(wù)導(dǎo)論 2022/10/23 52 圖片，資料來源係引用 ? 帝商科技 ? EPCglobal Taiwan ? EPCglobal Home 。s field, they immediately municate their presence by reflecting back a signal. This is useful when you want to know everything that is passing a reader, such as when items are moving quickly on a conveyor. In other cases, the reader wants to simply find specific tags in a field, in which case it wants to broadcast a signal and have only certain tags respond. RFID 應(yīng)用開發(fā)實務(wù)導(dǎo)論 2022/10/23 46 Singulation ? A means by which an RFID reader identifies a tag with a specific serial number from a number of tags in its field. There are different methods of singulation, but the most mon is tree walking, which involves asking all tags with a serial number that starts with either a 1 or 0 to respond. If more than one responds, the reader might ask for all tags with a serial number that starts with 01 to respond, and then 010. It keeps doing this until it finds the tag it is looking for. RFID 應(yīng)用開發(fā)實務(wù)導(dǎo)論 2022/10/23 47 Active Tag ? A . patent for the anticollision features of its eLink wireless munication protocol. When several RFID tags are in the field of a single reader, their signals interfere with one another, confusing the reader. Most anticollision protocols require active, or batterypowered, tags to remain awake while they municate with the reader until all their serial numbers are read. RFID 應(yīng)用開發(fā)實務(wù)導(dǎo)論 2022/10/23 48 Active Tag (續(xù) ) ? To conserve battery life, this came up with a protocol that doesn39。因此，我們可說RFID未來的市場有多大，安全與隱私權(quán)維護(hù)的憂慮就有多大。再者，購物內(nèi)容皆是個人隱私，若每一樣物品都內(nèi)建 RFID，不肖份子便可能輕易地在一定的範(fàn)圍內(nèi)窺視與收集到每個人的購物商品內(nèi)容。因此，雖然市場普遍看好 RFID，但需要各個領(lǐng)域的多數(shù)廠商加入，才可讓 RFID如同條碼與 POS系統(tǒng)一樣普及。 RFID具有可重複使用數(shù)十萬甚至數(shù)百萬次以上的特性，其材質(zhì)也能夠被放置於較為惡劣的環(huán)境中，因此比條碼更具有耐久性，自然成本也較為節(jié)省 。 RFID 應(yīng)用開發(fā)實務(wù)導(dǎo)論 2022/10/23 40 RFID 的優(yōu)點 (續(xù) ) ? 容量、速度與安全性 － RFID除了儲存的資料量遠(yuǎn)比傳統(tǒng)條碼多、不容易被偽造外，辨識讀取速度每秒可達(dá) 250個標(biāo)籤，這種多工成效遠(yuǎn)比傳統(tǒng)條碼一次掃瞄一個（單點連線流程， lineofsite）高得多，自然可以免除前述的困擾。日立（ Hitachi）甚至已經(jīng)發(fā)展出厚度僅有 、面積為 X RFID晶片，薄到可以嵌入紙幣中；因此 RFID的迷你體積可以隱藏在各種物品裡面。 RFID 應(yīng)用開發(fā)實務(wù)導(dǎo)論 202
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