German EMHART plug, EMHART model, EMHART price

EMHART plugs provide a standardized method for exchanging data between computer components, offering a universal approach to data transmission and control logic. From another perspective, if the Mother Board is a city, then the bus is like a public bus in that city, transporting constantly operating bit along fixed routes. Each line can only transmit one bit at a time. Therefore, multiple lines must be used simultaneously to send more data; the amount of data the bus can transmit simultaneously is called the width, measured in bits. The greater the bus width, the better the transmission performance. The bus bandwidth (i.e., the total amount of data that can be transmitted per unit time) is: Bus Bandwidth = Frequency × width (Bytes/sec).

EMHART plug composition

The fieldbus control system consists of three parts: the measurement system, the control system, and the management system, with the hardware and software of the communication part being its most distinctive features. 1) Fieldbus control system: Its software is an important part of the system. Control system software includes configuration software, maintenance software, simulation software, device software, and monitoring software. First, select development configuration software and human-machine interface software for control operations. Through the configuration software, complete the connections between function blocks, select function block parameters, and perform network configuration. During network operation, the system collects data in real time, processes data, and performs calculations. It optimizes control and logical control alarms, monitoring, display, reports, etc. 2) Fieldbus measurement system: It features multi-variable, high-performance measurement, enabling measuring instruments to have computing capabilities and other functions. Due to the use of digital signals, it offers high resolution, high accuracy, strong anti-interference, and anti-distortion capabilities. It also provides status information on instrument equipment, allowing adjustments to the processing process. 3) Device management system: It can provide diagnostic information, management information, device operating status information (including smart instruments), and manufacturer-provided device manufacturing information. For example, Fisher—Rosemoune Company launched the AMS management system. Installed in the main computer, it performs management functions and can form a comprehensive management system information library for field devices. Based on this, it enables device reliability analysis and predictive maintenance, changing passive management into a predictable management and maintenance mode. The AMS software is based on a T architecture with the field server as the platform. Supporting modular, feature-rich application software on the field server, it provides users with a graphical interface. 4) Bus system computer service mode: The client/server mode is a popular network computer service mode. The server represents the data source (provider), and the application client represents the data user, which obtains data from the data source for further processing. The client runs on a PC or workstation. The server runs on a minicomputer or mainframe, using the intelligence, resources, and data of both parties to complete tasks. 5) Database: It can organically and dynamically store large amounts of data and applications, achieving full data sharing and cross-access with high independence. Industrial equipment parameters change continuously during operation, resulting in large data volumes and high real-time requirements for operation and control. This has led to the formation of distributed, mutually accessible, and real-time database systems. Mature options available on the market include relational databases such as Oracle, sybas, Informix, and SQL Server; and real-time databases such as Infoplus, PI, and ONSPEC. 6) Network system hardware and software: Network system hardware includes system management hosts, servers, gateways, protocol converters, hubs, user computers, and underlying intelligent instruments. Network system software includes network operating software such as NetWarc, LAN Mangger, and Vines; server operating software such as Lunix, os/2, and Window NT; as well as application software databases, communication protocols, and network management protocols.

EMHART plug features

1) Physical characteristics: Also known as mechanical characteristics, these refer to the properties exhibited by bus components during physical connection, such as the geometric dimensions, shape, number of pins, and pin arrangement of plugs and sockets. 2) Functional characteristics: These refer to the function of each signal line. For example, the address bus is used to represent address codes. The data bus is used to represent transmitted data. The control bus represents commands, states, etc., for operations on the bus. 3) Electrical characteristics: These refer to the signal direction on each signal line and the voltage range representing valid signals. Typically, signals sent by the master device (such as CPU) are called output signals (OUT), and signals sent to the master device are called input signals (IN). Usually, for data and address signals, a high level is defined as logic 1 and a low level as logic 0. There is no customary convention for control signals; for example, WE indicates active low, and Ready indicates active high. There is no uniform regulation for the high and low voltage ranges of different buses; they usually comply with TTL. 4) Timing characteristics: Also known as logical characteristics, these refer to when signals on each signal line are valid during bus operations. Through agreed-upon timing relationships for signal validity, correct bus operation is ensured. To improve computer scalability and the universality of components and devices, in addition to internal chip buses, various components or devices connect to the bus in standardized forms and implement information transmission on the bus in standardized ways. These standardized connection and operation methods of the bus are collectively referred to as bus standards. Examples include ISA, PCI, and USB bus standards. Correspondingly, buses adopting these standards are ISA bus, PCI bus, and USB bus.

EMHART plug selection criteria

Communication between PC and smart devices often relies on RS232, RS485, Ethernet, and other methods, mainly depending on the device's interface specifications. However, RS232 and RS485 only represent the physical media layer and link layer of communication. To achieve bidirectional data access, one must write custom communication applications, but most such programs do not comply with ISO/OSI specifications. They can only achieve relatively single functions, are suitable for single device types, and lack universality. In a device network formed by RS232 or RS485 devices, if the number of devices exceeds 2, RS485 must be used as the communication medium. Information exchange between devices in an RS485 network can only be achieved through a "Master" device relay. This master device is typically PC, and only one master device is allowed in such a device network, with all others being Slave devices. Fieldbus technology is based on the ISO/OSI model, featuring a complete software support system capable of solving problems such as bus control, collision detection, and link maintenance.

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