The classification of industrial PDA includes barcode scanner, RFID reader and so on. Industrial-grade PDA is durable and can be used in many harsh environments, and has been optimized for industrial use. Catchwell CW30 industrial PDA can support RFID reading and writing and bar code scanning functions at the same time, and it has IP54 industrial grade, which is not available in consumer handheld terminals.
Consumer PDA consumer handheld terminals mainly refer to smart phones, handheld computers, tablet computers and so on.
The core of the main type of operating system is the operating system. At present, there are mainly two kinds of operating systems for palmtop computers on the market: one is the increasingly perfect palmtop operating system. At present, palmtop computers using palm system account for more than 65% of the world market share, mainly Palm, Workpad of IBM, Clie of Sony, TRGpro, handspring and other palmtop computers. The other is Microsoft's Win CE series, which started late, but has broken the situation that Palm OS dominates the world. Moreover, due to the extensive authorization of Win CE, most domestic palmtop computers now use Win CE system, including domestic Lenovo, Founder, Hewlett-Packard, Compaq and other foreign companies. As two major operating systems, products using PalmOS have a longer battery life than products using Win CE. The battery life of products equipped with color display screen is not as long as that of monochrome display screen products; Win CE is superior to Palm in multimedia performance. Moreover, in terms of operation interface and application performance, wince can make it easier for users to get started; In addition, Palm has more software than Win CE.
Of course, in addition to the above two operating systems, from the perspective of the whole international market, there are Pocket PC, EPOC, Hopen, Penbex, Linux and so on.
The operating systems of the three camps can be divided into three camps: Linux OS, Palm OS and Windows Mobile(Pocket PC). Palm adopts PalmOS system and is developed by Palm Company. PocketPC adopts WinCE series system developed by Microsoft. Because of the differences in performance and system, there are still considerable differences between the two entities.
LinuxOS is common in electronic notebooks. Although it is an electronic notebook, it has more or less added a lot of intelligent elements, which is also the originator of handheld computers. Common models: Sharp, business communication celebrities, accessible, etc. In a word, people who used to play PDA used to play electronic notebook, but its variety is too complicated and there is no standard, so it lacks continuity and manufacturability. You can only change it once a year. It's really a veritable notebook.
Palm uses Palm OS and Pocket PC(PPC) uses Microsoft Windows Mobile. PPC uses Microsoft's operating system. From WINCE to WINDOWS MOBLIE 5.0, the time for PPC to set foot in PDA is shorter than that of PALM, but because of its ease of use (similar to WINDOWS desktop system), it was quickly accepted by everyone, and now the price is similar to PALM, so its market share has expanded rapidly.
Pocket PC PPC generally uses high-speed CPU, which is generally above 200MHz (because its application software is relatively large), and its multimedia function is relatively strong. All products adopt color screen design, which is suitable for a wide range of people. However, the shortcomings are also obvious. The waiting time is relatively short. Due to its powerful CPU and multimedia functions, after years of improvement, its battery capacity has been increasing, but the waiting time has not been significantly improved. Generally, a new PPC can run continuously for about 5-7 hours at a time after being fully charged (depending on individual differences).
PALM, which appeared earlier, had a simple function of storing some personal information (telephone, notes, personal finance), but it quickly triggered a frenzy sweeping Europe and America. Because previous products did not attach importance to multimedia, the CPU speed was generally within 33MHz, but its application software was not weaker than PPC at all (because the application software was small in size and had low running requirements).
Moreover, its long standby capacity really makes PPC feel ashamed (Take PALM M505 as an example, the configuration of color screen machine is low, the continuous running time can reach more than 20 hours, it can be used for about 3 hours every day, and the charging time is about 10 day). Now PALM has begun to attach importance to multimedia functions and to produce some high-speed machines similar to PPC. With the higher configuration, the standby capacity began to decline rapidly, which was basically the same as PPC.
The basic function of the product is just like the name "PDA", which is similar to our desktop in many ways. For example, it also has CPU, memory, display chip and operating system. And just as personal computers are divided into Mac and Windows camps, PDA is also divided into Palm and PPC, the main difference lies in the different operating systems.
Even so, the functions of PDA are basically the same, which can be mainly used for taking notes, editing documents, playing games, playing multimedia, surfing the Internet through built-in or external wireless network cards and so on. And through many third-party software, you can also read e-books, image processing, external GPS card navigation and so on.
Main function recorder function
The "tape recorder" can record the contents of the meeting, the words of the interviewee, and leave every laughter in life. "Recorder" has two recording formats: PCM and mobile phone voice, among which the mobile phone voice format can record for several hours.
Functions of English-Chinese Dictionary
The Pocket Dictionary contains 6.5438+0.5 million English-Chinese two-way dictionaries. You can find the Chinese meaning by English words, or find the corresponding English expression by writing in Chinese. If you want to memorize words, start with A, there are enough words and phrases to make you reach the vocabulary of TOFEL and GRE.
Global clock control function
"Global Clock" can find the time of more than 100 countries and regions in the world, as well as the name of departure airport, sunrise and sunset time, telephone area code and kilometers from Beijing.
Pocket PC reminder function
Pocket PC provides a variety of reminder functions, including LED flashing reminder, vibration reminder, sound reminder and screen information display reminder. The sound reminder can also set different sounds. When setting a reminder, you can choose how long to execute the reminder in advance.
Leisure and entertainment function
People can't work all the time. What can they eat in their spare time to relax their nervous nerves? Pocket computers provide various leisure and entertainment functions to adapt to users with different personalities and hobbies.
Fax management function
As long as you have the fax software of PDA, you can realize the fax function of Modem/Fax.
Detailed configuration 1, built-in speaker
The built-in speaker refers to the built-in speaker of PDA. Users can not only listen to the sound from PDA through the headphone jack, but also through the built-in speaker.
2. Built-in microphone
Microphone is one of the input devices for PDA to collect sound sources. The built-in microphone of PDA is relatively small.
3. Battery type
Pocket computers need batteries to maintain normal operation. Pocket PC uses lithium ion battery or alkaline battery as power supply. There are few palmtop computers that use alkaline batteries as power supply, such as Acer S 10, PLAM M 100, Sony PEG SL- 10, etc. Most palmtop computers use lithium-ion batteries as power supply.
4. Built-in Chinese input method
PDA has a variety of text input methods, including English keyboard input, handwriting input, pinyin input, symbol keyboard input and direct handwriting input. Among these input methods, Monster Chinese and plug-in Chinese systems are commonly used.
5. Data transmission
Pocket PC is a small portable digital device. pocket PC has the advantages of portability and powerful functions, but its storage capacity is not large, so it is necessary to store the files in Pocket PC into the computer from time to time, which involves the connection mode with the computer. Data transmission interface is the interface between PDA and other devices (such as personal computers). With this interface, PDA and other devices can realize upload and download, data synchronization and other functions. Common data transmission interfaces of PDA include USB interface, serial port, infrared data association and Bluetooth interface.
6. Resolution of the display screen
Simply put, the resolution of the display screen refers to the ability of the display screen to analyze images. The higher the resolution, the clearer the image displayed on the display screen. For example, the early Palm models always used the monochrome resolution of 160× 160, which means that the horizontal and vertical directions of the display screen have 160 pixels. The resolution of color display screen is generally 240×320, 320×320, etc.
7. Bluetooth technology
Bluetooth is a short-distance wireless connection technology, which is used to replace cables or wires used in some electronic devices. Bluetooth technology can effectively simplify the communication between mobile communication terminal devices such as palmtop computers, notebook computers and mobile phones, and can also successfully simplify the communication between these devices and the Internet, thus making the data transmission between these devices and the Internet faster and more efficient. At present, there are many models of PDA with Bluetooth function. I believe that with the gradual development of PDA, Bluetooth function will become a universal function of PDA. But at present, PDA with Bluetooth function is more expensive.
The Bluetooth interface of PDA can also be wirelessly connected with other devices through the Bluetooth interface. It has the advantages of non-directional restriction, the effective connection distance is 10 m, the general transmission speed is 1 m, and the speed is as high as 10 m or even faster. However, there are not many electronic devices equipped with Bluetooth interface at present, which is far from the popularity rate in infrared data association. This is a pity. Computers without Bluetooth interface can realize the function of Bluetooth interface by installing Bluetooth adapter. These Bluetooth adapters are generally USB interfaces, which can be plugged into the USB interface of a computer, and are only the size of a U disk, which is far more convenient to carry than a data cable.
The application mode of Bluetooth technology on PDA is as follows: Through PDA, you can not only write email, but also send it immediately. No external connection with PC, everything is sent through Bluetooth device. In this way, I wrote an email on the plane with a PDA. When the plane lands, you just need to turn on your mobile phone, and all the information can be automatically transmitted through the Bluetooth device at the airport. With Bluetooth technology, your PDA can keep pace with the desktop system.
8. LCD screen type
The quality of PDA LCD screen is not only related to the comfort of PDA, but also an important aspect of PDA performance. At present, there are three kinds of color liquid crystal displays for PDA according to manufacturing technology: transmissive, reflective and semi-transmissive. At present, the latter two types of displays are mainly used in PDA, while transmissive LCD display is a technology adopted by early PDA, which is rarely used in newly introduced PDA.
9. Camera function
The camera function of PDA means that PDA can take photos, record short films and conduct online video through the built-in or external camera. Combined with PDA, this function can bring users more convenient and practical choices. As a new function of PDA, the pixels of PDA's built-in or external camera are relatively low, generally around 300 thousand pixels. Display color
There are generally two kinds of screens used in PDA: color display and monochrome display. Palm palmtop computers and PDA produced by early domestic manufacturers often adopt monochrome design. From a practical point of view, unless you plan to look at pictures on a PDA, there is no need to buy a PDA with a color monitor, because color monitors consume more electricity and are more expensive. Generally, the effective running time of color display screen is between 6-8 hours, and the use time of monochrome display screen can be as long as 30 hours. Of course, PDA with color display looks more fashionable and stylish. How to choose depends on personal hobbies and economic strength.
10, PDA compatible operating system
The index of compatible operating system refers to whether the driver of PDA can run various operating systems on the market well, such as windows98, windows2000, windowsXP, MAC OS, LINUX and so on. The more perfect the driver supporting operating system of PDA is, the more convenient it is to install and use, which is also a main index to measure the new PDA at present.
1 1, processor type
Processor (CPU for short) is the core component of PDA, which is mainly composed of controller and arithmetic unit, and its performance determines the performance of the whole PDA. At present, there are six types of processors used in PDA, namely, Intel's PXA series processor, MIPS series processor, StrongARM series processor, Hitachi SH3 processor, Motorola's Dragon Ball series processor and Texas Instruments' OMAP series processor.
12, memory type
The memory of PDA is generally divided into ROM (Read Only Memory) and RAM (Random AES Memory). ROM has a solidified operating system, and the remaining capacity can be used to store data, while RAM is mainly used to store data and run programs. The full name of RAM(Random Aess Memory) is random access memory, which is equivalent to mobile storage on PC, and is used to store and save data. It can be read and written at any time, and RAM is usually used as a temporary storage medium (called system memory) for the operating system or other running programs.
However, when the power is turned off, RAM cannot save data. If you need to save data, you must write them into a long-term memory (such as hard disk). Because of this, RAM is sometimes called "variable memory". RAM memory can be further divided into static RAM(SRAM) and dynamic memory (DRAM). DRAM is widely used as the main memory of the system because of its low price per unit capacity.
Compared with ROM, the biggest difference between PDA RAM and ROM is that the data stored in RAM will disappear automatically after power failure, while ROM will not. 4 ~ 8m RAM is enough to run general applications. If multimedia functions are pursued, 64M RAM capacity can only be regarded as a basic requirement.
The product category of PDA can be called electronic organizer in a narrow sense, and its function is relatively simple, mainly managing personal information, such as address book, notes and memos, schedules, notes, calculators, recordings, dictionaries, etc. Moreover, these functions are all solidified, and new functions cannot be added according to the requirements of users. PDA in a broad sense mainly refers to palmtop computers, and of course it also includes other small digital devices with similar functions.
The word Pocket PC also has different interpretations. In a narrow sense, PDA has no keyboard, and uses handwriting input, voice input or soft keyboard input. Pocket computers in a broad sense include both those without keyboards and those with keyboards. However, in the China market, almost all PDA's don't have keyboards. In fact, PDA should be subdivided into four categories: electronic dictionary, PDA, PDA device and personal communication assistant. The latter two are gradually merged together due to the development of technology and market.
Pocket PC Usually, only this kind of Pocket PC will be called PDA in the digital world, which also represents the true meaning of PDA. Because it has almost all the functions of a general home computer. The biggest feature of PDA is that it has its own operating system, which is generally solidified in ROM. Most of the storage devices used are expensive IC flash memory, and the capacity is generally around 16MB. PDA generally has no keyboard, and uses handwriting and soft keyboard input methods. At the same time, it is equipped with standard serial port, infrared access mode and built-in modem, which is convenient for personal computers to connect to the Internet. The biggest difference between PDA and previous products is the expansibility of its application. Based on their respective operating systems, anyone can use programming languages to develop corresponding applications. You can also install and uninstall it on your PDA at will. Because of its complete functions and complicated operation, it is not suitable for junior users who don't know much about computers.
Handheld computer equipment The English name of handheld computer equipment is HPC, which means HandheldPC. This is a product between notebook computer and PDA. Why do you say that? Because it has an operating system commonly used in PDA, but it is equipped with a small keyboard. Its appearance is similar to that of a traditional notebook computer. Its function is more powerful than PDA, but its size and weight have also increased, so its portable performance is worse than PDA.
Personal communication assistant Personal communication assistant is the most fashionable one among many products. Its concept is to combine some functions of PDA with mobile phones and pagers. The biggest feature of this product is to abandon the general telephone line and adopt the wireless data receiving method, which makes the product more adaptable. Although the early products were designed with mobile phones as the starting point, their business functions were obviously not as good as ordinary palmtop computers, only equivalent to ordinary electronic organizer. At present, the products developed based on WinCE system and Palm are collectively called smart phones, which have the same or higher functions as PDA, as well as communication functions and wireless data exchange, representing the development direction of PDA in the future.
The disadvantages of the model are also obvious: short waiting time (5-8 hours) and unstable third-party software. Classic models: h 565 ipaq 3630 ipaq 3970 ipaq 4150 ipaq 4700 ipaq 550a 60e740n 560 axim50 and so on. PALM, which appeared later than Linux OS, had a simple function in the early days, which was to store some personal information (telephone, notes, personal finance), but it quickly triggered a frenzy sweeping Europe and America.
Due to the lack of attention to multimedia in previous products, the CPU speed of PDA is generally within 33MHz, but its application software is not weaker than PPC (its software running efficiency and stability are high). Moreover, the long standby capacity really makes PPC feel ashamed (Take PALM M500 as an example, with black and white screen and low machine configuration, the continuous running time can reach more than 20 hours, and it can be used for about 3 hours every day, and the charging time is about 10 day).
Now PALM has begun to attach importance to multimedia functions and to produce some high-speed machines similar to PPC. With the higher configuration, the standby capacity began to decline rapidly, which was basically the same as PPC.