Question 2: What is the card reader The card reader (Reader) is a specialized device. There are slots to insert memory cards and ports to connect to the computer. Insert the appropriate memory card into the slot, the port is connected to the computer and the installation of the required driver, the computer will treat the memory card as a removable memory, so that you can read and write the memory card through the card reader. According to the type of compatible memory card can be divided into CF card reader, SM card reader, PCMICA card reader and memory stick reader, etc., as well as dual-slot reader can be used at the same time two or more than two cards; according to the type of port can be divided into serial port card reader (slow, rare), parallel port card reader (suitable for early motherboard computers), USB card reader (fast, easy to use). easy to use).
Question 3: What is the card reader The card reader is a tool to connect the phone memory card computer, the general cell phone can be connected to the computer through the USB cable, but sometimes in the case of the Chuan can do, then you can use the card reader, the area under the memory card, inserted into the card reader, and then *** the computer's USB interface, you can realize the memory card reading, now on the market, the phone has a variety of memory cards, each type of memory card, the card reader, and then *** the computer's USB interface, can be read. The memory card on the market is varied, each memory card has a different card reader, not universal, if you need to buy, you should bring the card, together with the purchase, otherwise buy back not necessarily work!
Question 4: What is a card reader? How to use? 20 points Simply put is to read the storage wow machine, insert the memory card into the corresponding card slot, and then insert the card reader into the USB port of the computer, the computer will automatically find (nowadays, the card reader is generally automatic installation of the driver, plug and play, so do not have to manually install the driver manually) a new removable disk (that is, your memory card). You can use the card reader to upload information, documents and other things to the computer, you can also copy and download files from the computer to the memory card, you can also use the computer to manage things on the memory card, such as deleting, moving, creating new and so on. Finally after using the card reader you can't directly unplug it from the computer, you have to click on Safely Remove Disk and wait for the computer to pop up that you can safely unplug the storage device then you can unplug the card reader! I hope my answer can help you, also hope to adopt!
Question 5: What does a card reader look like that can read the card inside the video camera? Multi-function card reader details
Mention the card reader, many people will immediately think of this product is to cooperate with the digital camera and produced, but is no longer limited to the use of digital cameras, but expanded to more areas. "Card reader" as the name suggests this is a device to read data, but it can not only support the reading of data also support the writing of data. Its initial design idea is mainly to make up for the defects of the digital camera data output and produced. Due to the early USB interface is not popular, so the output port of the digital camera are connected with the computer's serial port, due to the serial port of the data transfer speed is very low, if the data is copied to the hard disk, it will cost a lot of waiting time, therefore, the card reader came into being. With the development of MP3, PDA and other digital products, a strong impetus to the development of card readers. The current MP3 standard 256M or 512M flash memory obviously can not meet our needs, so add 1G or higher flash memory into my chicken standard configuration, but if we want to copy MP3 songs to flash memory, only through the MP3 player card reader
The player to carry out, and this time we need a special cable, driver and software to complete, so that the MP3 player can be portable and easy to use. This makes the MP3 player much less portable, and if we use a card reader, we don't need the intervention of the MP3 player at all, and we can store MP3 songs directly on the flash memory, so MP3 becomes more convenient to use.
Question 7: What does a card reader look like? And a USB flash drive This is a reference picture of a card reader. Since I can only post one picture, I'll just post the card reader one.
Question 8: What is a card reader made of? Card reader is divided into two categories, one for the contact card reader, a class of non-contact card reader, I only introduce the contact card reader.
Typically, contact card readers are divided into serial and u *** interface, 1~3 card head. The main components are:
mcu: usually selected with u *** and uart communication function, io port is more, ram is greater than 512 bytes, rom is usually first in 8k ~ 32k, the reader cost control is very important, now the reader has been a micro-profit products, a suitable mcu can save a lot of cost, the requirements of the io port drive ability is relatively strong, do not need peripheral chip, can be directly connected to the cpu. Chip, can be directly connected to the cpu, more recommended to use is the st7 series of chips and avr chips, especially the st7 chip, part of the chip has a clock output synchronization function, can save the clock circuit of the smart card.
ic card interface circuit: the requirements of icc vcc controllable, clk is 1 ~ 5m clock, can be closed, io / rst is necessary for compatibility with the previous commonly used memory cards, vpp / fun / pgm is also necessary, which io must be bidirectional to support the at45db041 memory card, the fus must be bi-directional, and the other can be unidirectional. Output control of io, ic interface is the most important anti-short circuit, the card to the signal is a unidirectional input signal. ic card holder is a card reader, the price of the largest change in parts, from more than 20 dollars to 3 ~ 5 dollars are, usually foreign manufacturers out of the downward pressure card holder is the most expensive, but also the best to ensure that 300,000 times the use of the command, the wear and tear on the ic card contacts is very small, the domestic small factories out of the rubbing type of card holder, may be 1 ~ 20,000 dollars. Card holder, may be 1~2 million times to be scrapped, and the card contact wear and tear is also relatively large. Therefore, it is recommended that the frequency of use of high occasions to choose the downward pressure card holder (such as: cafeteria ic card reader), the frequency of use of low occasions, according to the cost of the requirements of the selection of the appropriate card holder.
Communication interface circuits: if the u *** is relatively simple, just need to connect the line according to the u *** standard, the serial port needs to use the rs232 signal converter chip, such as max232, the ttl/cmos signals, converted to rs232 signals
If the cpu does not have a clock output function, but also need to build a cpu card clock signal source, usually a 3.579mAhm, the cpu card, the clock signal source, and the cpu card. Usually a 3.579m crystal with a gate circuit (such as 74hc02 composition).
Other necessary circuits, such as indicators, buzzers, etc., as needed
Question 9: Universal WIFI, and the card reader looks the same, how to use. You just need to put this thing *** computer USB port, and then the computer will automatically run this thing. Quite simple, if prompted by the lack of driver, you then go to the Internet to find the driver of your WiFi model, install can be used