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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.”

够简单吧? 随着谷歌和万维网的全部触手可及,我做了一些轻松的研究,并迅速将草稿汇总并呈现给戴夫。 “马克,这在技术上并不准确。 回去深入挖掘。“我跪下来继续研究韦根的历史及其运作方式。 我发现虽然技术始于磁化线,但今天Wiegand指的是门禁行业所依赖的整个界面。 更重要的是,我了解到我并不孤单。 许多人都提出了我的问题,“韦根是什么?”

深入挖掘以获得重要的东西

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 韦根效应 在早期的1970中。

韦根线, 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在他的实验室工作台上

在1970晚期,Wiegand和他的商业伙伴Milton Velinsky开发了一种使用韦根线进行访问控制的卡。 他们在卡中放置了两排独立的导线,当它们通过磁场时,会产生不同的电压输出,这些输出被视为信号。 该 韦根界面 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.

这个D1 / DO接口以及时钟/数据(用于磁条)已经持续存在,因为1970s作为访问控制的事实上的接口

读卡器。 今天大多数人谈论的时候 韦根卡, 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 韦根格式 只是通过两条输出线传输的一系列定义的二进制数据。 行业标准

带嵌入式Wiegand Wires的门禁卡,上排为D0,下排为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.

标准26-Bit Wiegand格式

虽然 韦根卡 在现代门禁控制行业,这项技术已经在很大程度上被更新,更便宜和更安全的门禁卡(即Mifare,iClass,Proximity)所取代。 然而,Wiegand接口仍然是将任何设备(卡,生物识别或PIN读取器)的数据传输到访问控制面板的标准惯例。

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.

Michael Davis撰写的关于Wiegand的两个重要信息来源如下:

留言

  1. 麦克风 说:

    这是很棒的帖子......

  2. 关于韦根历史的好文章。 感谢您抽出宝贵时间分享。

  3. 乔治 说:

    好的文章和解释不能更清楚。
    我用Google搜索了很多,但没有任何解释清楚。
    我真的很感激。
    非常感谢。
    乔治。

  4. 彼得沃伦德 说:

    非常有趣,谢谢分享。

  5. jm 说:

    很棒的文章。 这对我帮助很大!

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