rfid

RFID技术介绍

由 喜夏-厌秋 提交于 2019-12-29 16:51:07
RFID概念： RFID是Radio Frequency Identification的缩写，即射频识别，俗称电子标签。 什么是RFID技术？ RFID射频识别是一种非接触式的自动识别技术，它通过射频信号自动识别目标对象并获取相关数据，识别工作无须人工干预，可工作于各种恶劣环境。RFID技术可识别高速运动物体并可同时识别多个标签，操作快捷方便。 RFID是一种简单的无线系统，只有两个基本器件，该系统用于控制、检测和跟踪物体。系统由一个询问器(或阅读器)和很多应答器(或标签)组成。 RFID分类： RFID按应用频率的不同分为低频(LF)、高频(HF)、超高频(UHF)、微波(MW)，相对应的代表性频率分别为：低频135KHz以下、高频13.56MHz、超高频860M~960MHz、微波2.4G，5.8G FID按照能源的供给方式分为无源RFID，有源RFID，以及半有源RFID。无源RFID读写距离近，价格低；有源RFID可以提供更远的读写距离，但是需要电池供电，成本要更高一些，适用于远距离读写的应用场合。 RFID的基本组成部分： 标签(Tag)：由耦合元件及芯片组成，每个标签具有唯一的电子编码，附着在物体上标识目标对象； 阅读器(Reader)：读取(有时还可以写入)标签信息的设备，可设计为手持式或固定式； 天线(Antenna)：在标签和读取器间传递射频信号。

认识RFID

由 断了今生、忘了曾经 提交于 2019-12-29 16:50:53
RFID 射频识别即RFID（Radio Frequency IDentification）技术，又称电子标签、无线射频识别，是一种通信技术，可通过无线电讯号识别特定目标并读写相关数据，而无需识别系统与特定目标之间建立机械或光学接触。 RFID的含义 　　RFID是 Radio Frequency Identification 的缩写，即无线射频识别，俗称 电子标签 。 RFID技术简介 　　最初在技术领域，应答器是指能够传输信息回复信息的电子模块，近些年，由于射频技术发展迅猛，应答器有了新的说法和含义，又被叫做智能标签或标签。RFID电子电梯合格证的阅读器（读写器）通过天线与RFID电子标签进行无线通信，可以实现对标签识别码和内存数据的读出或写入操作。典型的阅读器包含有高频模块（发送器和接收器）、控制单元以及阅读器天线。　RFID射频识别是一种非接触式的 自动识别技术 ，它通过 射频信号 自动识别目标对象并获取相关数据，识别工作无需人工干预，可工作于各种恶劣环境。RFID技术可识别高速运动物体并可同时识别多个标签，操作快捷方便。 　　RFID是一种简单的无线系统，只有两个基本器件，该系统用于控制、检测和跟踪物体。系统由一个询问器（或 阅读器 ）和很多 应答器 （或标签）组成。 RFID的基本组成部分 　　标签（ Tag ）：由耦合元件及芯片组成，每个标签具有唯一的电子编码

USB RFID reading tag using C# connected through serial port

由 社会主义新天地 提交于 2019-12-25 18:37:50
问题 I have manage to connect to my RFID devices through USB port with a console application using the code below using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.Net.Sockets; using System.IO.Ports; using System.Threading; using System.Windows.Forms; using Gtk; namespace Testing1 { public class Testing1 { public static SerialPort iSerialPort = new SerialPort(); static int Main() { string strException = string.Empty; string

How do I read passive NFC/RFID units with PN532?

由 半世苍凉 提交于 2019-12-25 09:27:46
问题 I got the little red "ELECHOUSE V3" kit off of eBay with a white card, and a blue keyfob transponder, and I've written a C program which creates and decodes packets and I can send it commands and it responds with AC packets, and I can read the version and the status. I'm not using any RFID library, I'm just using plain C and making my own simple library because I want to understand it and I want to release a simple single file demonstration for people who really want to understand it rather

ISO 15693: OMNIKEY Contactless reader, occasional read failure

由 流过昼夜 提交于 2019-12-25 06:45:49
问题 I am investigating an intermittent issue where reading eight blocks of data from a TI Tag HF-I RFID card from an HID OMNIKEY contactless reader. The ReadEightBlocks routine below is called 8 times from a for loop that bumps startBlockNum up by 8 each time. Reading all 64 data blocks on the card with 8 reads of 8 blocks. ReadEightBlocks calls SmartCardTransmit() that in turn calls SCardTransmit() . However, reading the second 8 blocks occasionally fails with an error code of 0x6A 0x82 . Can

How to run RFID tag listener method in javafx project?

由 一世执手 提交于 2019-12-25 01:46:47
问题 I am working on a project involves RFID technology, what i am trying to do at the moment, once the RFIDTagListener method runs, I basically pass a tag to a reader which its serial number will be sent to a server to get some relevant data back and pop them on a GUI screen. what I have done so far is getting the data upon sending reader's data manually without passing a tag becasue I don't know how to do it otherwise and here is the problem. where I am working on a javafx project and when I

Serial Port reading HEX data and insert in the separate textboxes (Book RFID Hex & User RFID Hex)

由 我的未来我决定 提交于 2019-12-24 16:42:42
问题 GUI of Project [ In this image I am using UHF reader's software for testing of RFID cards so my end result in the textboxes should be unique 12-byte HEX of RFID card [ (image 2 preview) Basically, I am working on Library Management System(LMS) project & I am trying to issue books by using the User identity ( User RFID Tag ID in HEX ) and Book identity ( Book RFID Tag ID in HEX ). When user will come in the library for issue a book then he/she will swipe his/her RFID card as a result user ID

Different values of different RFID readers

由 痞子三分冷 提交于 2019-12-24 10:48:23
问题 I have two different RFID readers which both give different outputs. One RFID readers is this one from dealextreme: http://dx.com/p/intelligent-id-card-usb-reader-174455 It is plug and play. Of the other reader I only have the program which we use to generate the code which is HidIdMonitor.exe The first one generates the following code: 0221365003 The second one generates the following code: 010d31c30b The problem is that I cannot find any form to convert one code to the other. Is there

Byte array gets truncated when writing to memory of RFID tag using Adafruit PN532 library

由 杀马特。学长 韩版系。学妹 提交于 2019-12-24 10:35:27
问题 I'm trying to write a byte array that was converted from a hex string into the memory of an NTAG203 RFID tag. I'm using a Raspberry Pi 3, a PN532 chip and the Adafruit PN532 python library. hex_string = '59e7168f267df300018e15b0' formatted_hex = bytearray.fromhex(hex_string) byte_data = bytearray(16) byte_data[3:15] = formatted_hex if not pn532.mifare_classic_write_block(4, byte_data): print('Error! Failed to write to the card.') sys.exit(-1) When I do pn532.mifare_classic_read_block(4) to

Android read from keyboard

由 跟風遠走 提交于 2019-12-22 14:50:08
问题 I have this logon screen with no textfields at all. When the user scans his id token with rfid scanner, i'll get a 8 character long string. Its the same princip as using an keyboard(just faster). I want my login activity to act, when the user has scanned his token and not before. Is there a smart way implementing this? I can't have any button or textfields, so I have to read keyboard input without listening to a EditText field. So, an empty screen with an image(lock), that listens to an rfid
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