What Is a Handheld PDA?
Handheld PDA is the abbreviation of Personal Digital Assistant, which literally means "personal digital assistant". This handheld device in the early applications mainly concentrated computing, telephone, fax and network functions. Can be used to manage personal information (such as contacts, plans, etc.), browse the Internet, send and receive E-mail, can send faxes, and can also be used as a mobile phone. [1]
Handheld PDA
At present, as a portable data processing terminal, a handheld PDA has the following general characteristics:
1, with data storage and computing capabilities;
2. Secondary development is possible;
3. Data communication with other equipment;
4. Man-machine interface, specifically display and input functions;
5. Removable battery for power supply.
In addition to the basic information processing functions of traditional handheld computers, handheld PDAs have added many new professional functions according to user requirements.
1. Barcode scanning: There are two main technologies for bar code scanning: laser and CCD. Laser scanning can only read one-dimensional barcodes. CCD technology can recognize one-dimensional and two-dimensional barcodes. Technology is faster and more convenient than CCD technology.
2. RFID reading and writing: It mainly uses wireless radio frequency technology to complete data collection and transmission. RFID is divided into three types of low frequency, high frequency and ultra high frequency. The handheld PDA with RFID reading function can support multiple cards This type of operation has a wide range of applications in transportation, access control, logistics, time and attendance, cargo management, and identification.
3. Fingerprint collection : Hand-held PDA with integrated fingerprint collection and comparison function is mainly used for public security, social insurance and so on.
4. GPS positioning: mainly used for logistics distribution, providing electronic maps and positioning services for courier personnel and distribution drivers.
5. GSM / GPRS / WCDMA wireless data communication: The main function is to perform real-time data exchange with the database through wireless data communication. This function is mainly used in two cases. One is an application that requires high real-time data. The other is that the application may not be able to store the required data in a handheld PDA for various reasons. The data is too large and may need to be kept secret and so on.
6. GSM / GPRS / WCDMA wireless voice communication: This function is mainly used for voice calls. After secondary development, it can replace walkie-talkies to a certain extent.
7. Infrared data communication (power infrared): a short-range wireless data communication technology. The power infrared protocol is a standard issued by the Ministry of Electric Power of China. It is a data communication standard for power equipment. With this function.
8. Bluetooth communication: The Bluetooth communication function is a new generation of short-range wireless communication technology. Currently, more handheld PDAs and mobile phones are used. The short-range Bluetooth communication can reach 10m, and the long-range Bluetooth communication can reach 100m. When the amount of communication data is not large, Bluetooth technology can also replace 802.11B networking.
9 , RS232 serial communication: is a most basic data communication method, most handheld PDAs have this function.
10. USB communication: Because of its fast communication speed, USB communication technology is currently used by many handheld PDAs. Its main purpose is to exchange large amounts of data with PCs.
11. WiFi 802.11b / g / n : 802.11b / g / n is the mainstream technology of wireless local area network. The current development speed is very fast. Many handheld PDAs have been equipped with this function. Networking and data exchange with PCs, servers, etc. can be performed in large enclosed spaces (such as factory buildings, warehouses) for wireless data exchange. If the space exceeds the range that the wireless signal can cover, you can add multiple nodes to solve it.
12. Input method and handwriting recognition: If you want to input Chinese characters, the input method is indispensable. The input method used by current handheld PDAs is also constantly updated with the needs of the times and user habits. If the user needs a lot of text input, the handwriting recognition function can quickly solve this problem, so the input function of some handheld PDAs also includes the handwriting input function.
13. Printing: Some handheld PDAs also integrate the printing function, which can be directly connected to a printer to print documents.
14 , other functions, there are some handheld PDAs with some other functions, such as camera, SD expansion card slot, SIM plug-in card slot, PSAM encryption module, etc., can be configured according to user needs.
The main mobile application fields of handheld PDAs in China are as follows:
1. Express logistics. Typical courier, postal delivery, e-commerce delivery, tobacco delivery, warehouse inventory, and terminal delivery, drug delivery, major factory in-house logistics, and logistics company warehouse-to-warehouse transportation. The logistics system uses different handheld PDA expansion functions according to different systems. The main functions used are barcode scanning, contact / non-contact IC card reading and writing, WiFi, Bluetooth data communication, etc.
2. Three meter reading. In the foreseeable future, this is a large-capacity market. The extended functions integrated in the three-meter meter-reading handheld PDA device are mainly power infrared, barcode scanning and data communication.
3. Mobile law enforcement. The technological content of police equipment is getting higher and higher, especially the traffic police, patrol officers and criminal police have also begun to be equipped with handheld PDAs, which provides more powerful tools for police enforcement. In addition to police affairs, the administrative departments of health, urban management, taxation, etc. have also begun to use handheld PDAs to standardize administrative services for fast retrieval of information, case entry, on-site evidence shooting, on-site inspections, and real-time uploading of illegal punishment results to achieve law enforcement Personnel impartial and transparent law enforcement and mobile government office. The functions of the handheld PDA used in mobile police are mainly GPRS / WCDMA data, voice communication, IC card reading and writing, and fingerprint collection, comparison and so on may be needed in the future.
4. Retail. When the supermarket chain transactions are increasing and the counter space is no longer sufficient for rapid transactions, mobile applications based on handheld PDAs can be used for timely and accurate replenishment of single products, receipt and delivery, shelves, inventory, price verification, and mobile Price tag management, realizing mobile shopping guides, fast cashiers, and channeling peak passenger flow.
5. Manufacturing. It is used for real-time monitoring of material flow in factories and production workshops, warehouse receipt, delivery, inventory scanning inspection, and real-time query of finished product supply information.
6. Ticketing. It is used to automatically identify and collect ticket information, improve the efficiency of ticket inspection, save waiting time for ticket inspection, quickly guide peak passenger flow, and upload real-time statistics of ticket information to facilitate management statistics. Such as subway ticket sorting, replenishment on trains, stadium ticket sales, attraction ticket check and so on.
7. Medical. In doctors' rounds, mobile nurse stations, and outpatient infusion application systems, handheld PDAs can be used to view various patient information in real time, to implement doctors' orders before the bed, collect nursing data, quickly execute doctors' orders and nursing tasks, check patient and medication information, thereby reducing Medical errors to enhance infusion safety.
8. Traceability. It is used to trace the whole quality of the product's entire life cycle, and to prevent counterfeit and anti-channeling management in the channel circulation to ensure accurate product placement and effective recall of problem foods.
9. Educational publishing. In the field of education and training, it can be used to assist teachers to record results, conduct assessment management, check student attendance, urge students to exercise, monitor student sports data, and perform real-time statistics and query. The library can be used for book shelving, fast data entry, inventory and book distribution management.
10. Financial insurance. For example, the safe transfer of cash box escorting, mobile insurance system and endowment insurance payment. The functions required for a handheld PDA in financial insurance applications are GPRS / CDMA data or SMS communication. The extended functions of the handheld terminal required for the on-site pension distribution are mainly fingerprint collection and comparison functions.
11. Patrol management. It can be used for community security and patrol police to standardize routes when performing patrol tasks, and it can also be used for route planning of train inspections, and the maintenance results are recorded and uploaded in real time.
12. Parking charges. It is used for the management of parking charges on streets in urban roads, such as real-time display of berth dynamics, automatic warning of non-payment or overtime parking, and punishment of illegal parking scenes by holding a PDA.
13. Garbage recycling. It is used for automatic collection of urban waste scanning and weighing data, real-time positioning and transmission through a handheld PDA, and accurate detection of recovery values.
14. Other applications. For example, card management is used to manage various IC cards and contactless IC cards, such as identity cards and membership cards. Card management, as the name suggests, is to manage various contact / contactless IC cards, so the main extended function of the handheld PDAs it uses is contact / contactless IC card reading and writing.
iData series handheld PDA based
processor: | Dual-core 1.0 GHz high-performance ARM Cortex-A7 processor |
operating system: | Android 4.2.2 |
RAM: | 4GB ROM + 1 GB RAM |
Expansion slot: | MiniSD card (up to 32G), MicroSD slot |
Display: | 3.5-inch, HVGA (320x480) TFT high brightness, LED backlight |
Camera (optional): | 5MP autofocus with LED fill light |
Scanning window glass: | Corning® Gorilla® glass |
keyboard: | 28-key anti-wear, internal light-transmitting industrial keyboard |
touch screen: | Industrial capacitive touch screen |
battery: | 3.7V4000mAh lithium polymer battery (optional 6000mAh battery) |
Audio: | Built-in microphone |
prompt: | Vibration alert / LED alert / audio alert |
Vibration motor: | Built-in programmable vibration motor |
development tools: | Android SDK + JDK + Eclipse |
Supported languages: | Java, C |
Management tools: | iData tools |
Operating temperature: | -10 ~ 50 |
storage temperature: | -20 ~ 60 |
humidity: | 0 ~ 95% (non-condensing) |
Drop specifications: | Repeatedly dropped 1.5 meters on concrete ground |
Roll down specifications: | 500 rolls from a height of 0.5 meters (1000 hits) |
Protection level: | IP65 |
Electrostatic discharge: | ± 15kV air discharge, ± 8kV direct discharge |
Size (LxWxD): | 152 mm x 68 mm x 24 mm |
weight: | 255g (including standard battery) |
Wireless voice communication: | 3G: WCDMA 850 / 2100MHz 2G: GSM 900/1800 / 1900MHz |
Wireless wide area network: | HSPA / GPRS |
Wireless LAN: | Wi-Fi 802.11b / g / n |
Bluetooth: | Bluetooth 4.0 |
GPS: | High-performance GPS / AGPS navigation chip |
Input / output interface
USB interface: | 1 (Micro USB interface) |
Headphone plug: | 1 |
Charging dock interface: | 1 (bottom data interface) |
Serial interface: | 1 (TTL) |
1D laser scanner
Optical resolution: | 4 mil |
Scan depth of field: | 3.81 cm-60.98 cm |
Scanning angle: | 47 ° ± 3 ° (standard) |
Scanning speed: | 102 times per second ± 12 times (both directions) |
One-dimensional linear imager
Reading mode: | CCD |
Reading accuracy: | 4 mil |
Decoding speed: | Up to 300 times / second |
2D area imager
Optical resolution: | 3 mil |
Scanning angle: | Omnidirectional |
Scanning speed: | 300 times per second |
Infrared communication module
Built-in infrared communication module: | Double transmitting tube structure, up to 5 meters of meter reading distance; Fully support DL / T645 protocol, support domestic and international mainstream meter manufacturers communication protocol; | |
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Interface standards: | Initial rate of 1200bps, support rates of 1200, 2400, 4800, 9600bps, etc. | |
RFID radio frequency read and write
frequency: | 13.56 MHz |
Reading distance: | Within 50mm |
Protocol: | ISO14443A (B) / 15693 |
Peripheral equipment and accessories
Standard accessories: | Battery, bottom data cable, hand strap |
Optional accessories: | Single-slot USB communication charging cradle, 4-slot battery charger, silicone case, smart stylus |
