News Center

Various types of PDA handheld terminal data acquisition working principle

Release Time:2020-07-29

PDA handheld terminal is more and more widely used in various industries, the reason is small size, light weight, high performance, suitable for mobile operations, it is the bar code scanning device and data terminal integration, with a battery can be offline operation of the terminal computer equipment.

PDA handheld terminal has the functions of real-time acquisition, automatic storage, real-time display, real-time feedback, automatic processing and automatic transmission, which provides guarantee for the authenticity, validity, real-time and availability of field data.

PDA handheld terminals are divided into five categories according to acquisition technology: standard laser PDA handheld terminals, MEMS PDA handheld terminals, linear image PDA handheld terminals, two-dimensional image PDA handheld terminals, and RFID PDA handheld terminals.

1) Standard laser PDA handheld terminal

The standard laser PDA handheld terminal works with the galvanometer through the laser beam, and automatically moves the beam left and right on the barcode to read the barcode. The laser engine has a variety of configurations (e. g., standard distance, wide viewing angle, high density, long distance, and high visibility) to meet the needs of different applications. The biggest advantage of standard laser PDA handheld terminals is distance: they can read barcodes from several feet away. In fact, if the printed label symbol is large enough, the laser can read it from up to 35 feet (10.7 meters) away.

Best suited for applications:

● Scan one-dimensional bar codes on high-rise shelves in warehouses and distribution centers

2)MEMS laser PDA handheld terminal

The MEMS laser PDA handheld terminal uses a silicon chip instead of the galvanometer of a standard laser scanner, resulting in faster scanning rates, higher reliability, and greater performance advantages over standard laser scanning engines. MEMS technology enables laser scan engines with new capabilities, including faster scan rates, miniaturization, excellent durability, and frictionless mechanical parts to ensure long-lasting performance. Its initial scan rate is more than five times faster than existing mechanical laser scanners using motors, and can be increased to thousands of scans per second in future products.

Best suited for applications:

● Standard distance (arm length) scanning in retail, medical and warehouse applications

3) Linear image PDA handheld terminal

Linear image PDA handheld terminals all use fixed parts, without any moving parts, so they are more reliable than laser scanners, which use a fast-moving lens to move the beam on the bar code. To read the bar code, the linear image PDA handheld terminal needs to illuminate it with light from an LED and focus the bar code image onto the CCD component through a lens.

Best suited for applications:

● Retail POS

● Inventory management and order picking

● Production line supplement

4) Two-dimensional image PDA handheld terminal

A two-dimensional image PDA handheld terminal can capture an image of a two-dimensional or linear barcode and process it using advanced decoding algorithms. This collector can be omnidirectional reading of linear bar codes, so it can be scanned without changing the label orientation. In addition, the two-dimensional image PDA handheld terminal is also suitable for reading two-dimensional bar codes. Two-dimensional barcodes can carry more information in less space than linear barcodes, so they are very suitable for applications where space is limited, such as printed circuit board production, medical treatment and package delivery.

Two-dimensional image PDA handheld terminals can capture actual images (e. g., signatures or damaged containers), making them ideal for field service, delivery documents, and shipping/receiving applications.

Best suited for applications:

● Shipment and receipt through 3PL carriers

● Production tracking

● Field Service and Package Delivery

● Insurance

5) RFID PDA handheld terminal

RFID is currently a complementary technology to barcodes, but has the potential to replace barcode technology in specific supply chain applications. In the short term, a combination of barcode scanning/RFID reading and writing allows operators to work with both technologies simultaneously through an RFID PDA handheld terminal.

Best suited for applications:

● More libraries

● Inventory management

● Supply Chain Tracking

● Parts traceability/product pedigree

● Asset management