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Wiegand For Dummies

Recently, our CEO, David Carta, called me into his office and asked me, “Mark, what is Wiegand?” He was instructing a new Telaeris employee about XPressFreedom, our Wiegand to Ethernet converter which we use to enable mobile access control with existing system. He thought that I, as our sales lead, should be able to give an appropriate explanation. Like a deer in the headlights I froze, knowing that I did not have a solid, technically sound answer. Feeling the gaze of our newest employee upon me,

I threw a panicked cookie-cutter answer against the wall, hoping that it would be satisfactory. It wasn’t and I knew it. Worse, I knew Dave knew it. Fortunately, he didn’t lambaste me in front of our new co-worker, but as I left the room, my tail was hanging between my legs.

Later that day, Dave called me into his office to address the encounter from earlier in the day. Part of Telaeris’ culture is to deliver the very best support and knowledge to our clients, in our efforts to be the worldwide leader in mobile access control solutions. As our primary salesperson, he wanted to be sure that I could provide top notch technical knowledge, in order for me to provide the very best service possible to our customers. Dave’s instruction to me came in the form of a challenge, “Mark, I want you to write our next blog article about Wiegand.”

Cukup sederhana bukan? Dengan Google dan keseluruhan World Wide Web di ujung jari saya, saya melakukan riset ringan dan dengan cepat melemparkan draf kasar dan menyajikannya kepada Dave. “Mark, ini tidak akurat secara teknis. Kembalilah dan gali lebih dalam. ”Saya meringkuk dan terus meneliti sejarah Wiegand dan bagaimana cara kerjanya. Saya menemukan bahwa sementara teknologi dimulai dengan kabel bermagnet, hari ini Wiegand mengacu pada seluruh antarmuka yang menjadi dasar industri akses kontrol. Bahkan lebih, saya belajar bahwa saya tidak sendirian dalam kebingungan saya. Banyak orang lain yang berbagi pertanyaan saya, "Apa itu Wiegand?"

Gali lebih dalam untuk mengetahui apa yang penting

John R. Wiegand moved from Germany to the United States in the 1930’s, in order to study piano and choral conducting at New York’s world famous Julliard School of Music. He later became an engineer, but it was his perfect pitch that allowed him to hear changes that occurred as his wires were magnetized that led to his discovery of the Efek Wiegand di 1970 awal.

Kawat Wiegand, patented by Wiegand in 1974, is composed of a magnetic iron-alloy that is designed to form a hard outer casing around a softer inner core. When passed through a magnetized field, the outer shell magnetizes quickly until it reaches full capacity. Once this occurs, the inner core begins to magnetize, and then surprisingly, the core and shell switch polarity. This creates a significant voltage pulse until the wire reaches full magnetization, then it reverts back to its original polarity. These voltage changes are easily detectable.

John Wiegand di bangku laboratoriumnya

Pada akhir 1970's, Wiegand dan mitra bisnisnya, Milton Velinsky, mengembangkan kartu menggunakan kabel Wiegand untuk tujuan kontrol akses. Mereka memposisikan dua baris kabel yang terpisah dalam kartu, yang ketika melewati medan magnet, menciptakan berbagai output tegangan yang diperlakukan sebagai sinyal. Itu Antarmuka Wiegand is for readers that could detect these cards output data over two signal lines called D0 (Data Zero) and D1 (Data One). This sequence of 1XCHARXs and 0XCHARXs mapped to a binary number. WiegandXCHARXs card was seen as an improvement over existing mag-stripe cards which could be re-written easily. Not only could Wiegand cards not be re-written, they were difficult to manufacture, which meant they were difficult to counterfeit.

Antarmuka D1 / DO ini bersama dengan Clock / Data (digunakan untuk mag-stripe) telah bertahan sejak 1970s sebagai antarmuka de-facto untuk kontrol akses

pembaca kartu. Ketika kebanyakan orang hari ini berbicara tentang Kartu Wiegand, they are not thinking about a card with wires. Most often they are talking about an RFID enabled card (i.e. Prox, Mifare, iClass, etc.) that outputs card data using WiegandXCHARXs D0/D1 interface.

A Format Wiegand hanyalah serangkaian data biner yang ditransmisikan melalui dua kabel output. Standar industri untuk

Kartu Akses dengan Kabel Wiegand Tertanam, baris atas adalah D0 dan baris bawah adalah D1

the first decade was a 26-bit format, using 8 bits for the facility code, 16 bits for the user ID. Today, there are many different and custom formats, with the largest being a 200 bit PIV standard used by the US government. The figure below illustrates the use of 26-bit Wiegand.

Format Wiegand 26-Bit Standar

Sementara Kartu Wiegand masih dalam produksi, dalam industri kontrol akses modern teknologi ini telah banyak digantikan oleh bentuk kartu akses yang lebih baru, lebih murah dan lebih aman (yaitu Mifare, iClass, Proximity). Antarmuka Wiegand, bagaimanapun, tetap merupakan konvensi standar untuk transmisi data untuk perangkat apa saja (kartu, biometrik, atau pembaca PIN) ke panel kontrol akses.

In conclusion, what began as a simple challenge to learn more about Wiegand, quickly became a fascinating learning experience about the roots of the access control industry. Utilized across a broad scope of access control manufacturers, the Wiegand interface is still the beast of the industry, and it refuses to die off. The use of the Wiegand interface technology isn’t going anywhere in the near future, as the depth of its use far exceeds any up and coming technologies. Nearly fifty years ago, John R Wiegand discovered a cool way to manipulate the magnetic polarity of his custom wires; little did he realize that it would redefine an entire industry.

Dua sumber informasi yang bagus, keduanya ditulis oleh Michael Davis di Wiegand di bawah ini:

komentar

  1. mikropon mengatakan:

    Ini pos luar biasa ……

  2. Artikel bagus tentang sejarah Wiegand. Saya menghargai Anda meluangkan waktu untuk berbagi.

  3. Giorgio mengatakan:

    Artikel dan penjelasan yang bagus tidak bisa lebih jelas.
    Saya sering mencari di Google, tetapi tidak ada penjelasan yang jelas seperti milik Anda.
    Saya sangat menghargai.
    Banyak terima kasih.
    Giorgio.

  4. Peter Warrender mengatakan:

    Sangat menarik, terima kasih telah berbagi.

  5. jm mengatakan:

    Artikel yang bagus. Itu sangat membantu saya!

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