Digital management is the key to improving the level of logistics management. However, for logistics management, the concept of digital management should include: A. Electronic management of goods shipped (including construction and transmission); B. Location of goods in transit Informatization. The former is mainly realized by reading the identification code (bar code or RFID) of the goods being transported; the latter is realized by the GPS positioning system and the wireless mobile network. Therefore, in the data collection and transmission of the logistics management system, ensuring effective data identification and data transmission is the key to the whole system.
Second, the status quoMany people should be familiar with bar code labels and RFID. The former uses optical scanning, and there is no physical occlusion between the scanner and the bar code. The latter uses the "electromagnetic field scanning", and there can be occlusion between the two. But in the end, the data read by both is just an identity code. The real data must be read through the pre-established database through the identity code read by the reader. Secondly, because barcodes and RFIDs are read by weak or passively coupled signals from barcodes and RFID tags (those that are active and can store small amounts of data are actually beyond the definition of RFID itself). Therefore, the reading distance is very limited. In addition, since the two tags do not store data themselves, the signal reader must be connected to the database and thus has poor flexibility. These limitations greatly limit the role of its play.
Therefore, the logistics management system based on ZIGBEE and RFID is an application system based on Zigbee and RFID, a new wireless communication technology in the field of communication. Its main features are as follows: long-distance information reading; self-contained data; long-distance data writing; reading and writing equipment is very simple and reliable, and the price is very low. Therefore, the use is flexible and convenient, and the construction cost is low.
Third, Zigbee, RFID technology introductionZigbee is a commercial name for wireless connectivity technology that addresses low-cost, low-power, low-complexity, low-transmission, close-range device networking applications.
Built on the 802.15.4 protocol stack, the ZigBee standard features powerful device networking capabilities that support three main types of self-organizing wireless networks, namely star, mesh, and cluster trees. , especially the mesh structure, has strong network robustness and system reliability.
Star network structure features
Support point-to-point, point-to-multipoint communication center node is ZIGBEE coordinator, terminal node is ZIGBEE terminal equipment, all data passes through the central node, which is suitable for circular decentralization, and the distance is relatively close. The device is connected with MESH mesh network structure. The system adopts multi-hop routing communication. Large network capacity can span a large physical space, suitable for structures that are more distant and more dispersedThe network of the MESH mesh network topology has powerful functions. All entities of the network can communicate with each other only within the communication range. If there is no direct path, it can also communicate by means of “multi-level hoppingâ€; the topology It can also form an extremely complex network; in addition, the network has self-organizing and self-healing functions.
Single Mining Power Supply 2200W
Description:
1.80 Plus Platinum Certified - Deliver up to 90% efficiency and reduce operating cost.
2.140mm Dual Ball Bearing Fan - Providing maximum airflow and near-silent operation.
3.Universal AC Input Design - Stable enough for 180-260V voltage input available.
4.Active PFC - Enhances power output efficiency and increases the performance and stability of your system.
5.With EMC Anti-electromagnetic Interference - Full copper output wire and sufficient material & high transforming rate.
Specifications:
Item name: 2200W Ethereum Mining Power Supply
Input Voltage: AC 180V~240V
Support graphics card :8
Color: Black
Size: 15 x 14 x 8.6cm
Rated power: 1800W
High Performance of Computing,10% Higher Than Same Level Motherboards.
Equipped Sodimm DDR3 Memory Slot,8*6PIN PCIE X16 Power Supply Socket,Significantly Improve Motherboard Performance.
The Voltage Stabilizing Capacitor Can Provide A Stable Voltage for Your Power Supply Equipment.
It Can Ensure Quiet Performance, Low Power Consumption, Less Heat Generation, Energy Saving and Safe Use.
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