German CSM Computer-Systeme plug, CSM Computer-Systeme model, CSM Computer-Systeme price

CSM Computer-Systeme plug is a common line or path used in computers to connect various functional components and transmit data between them. In computer systems, buses can be classified according to the objects they connect: Chip bus, also known as device-level bus, which is the bus inside the central processing unit chip. Internal bus, also known as system bus or board-level bus, which is the transmission path between various functional components of the computer; microcomputer buses are usually referred to as internal buses. External bus, also known as communication bus, which is the transmission path between computer systems, or between the computer host and peripheral devices. In computer systems, the common path for transmitting information between various components is called the bus, and microcomputers connect various functional components using a bus structure.

CSM Computer-Systeme plug principle

A bus is a shared data transmission device. Although multiple devices can be connected to the bus, typically only one pair of devices participates in data transmission at any given time. According to the form of information transmission, buses can be divided into parallel buses and serial buses. A parallel bus transmits n bits of binary information simultaneously using n transmission lines. Its characteristics are high transmission speed, but the system structure is more complex; it is used for connections between various components within a computer system. A serial bus shares one transmission line for multi-bit binary information, with the multi-bit binary information passing through the bus in chronological order. Its characteristics are simple structure, but its transmission speed is slower. The bus must have clear specifications: Bus timing protocol, meaning that certain timing rules must be followed when transmitting information on the bus, such as synchronous bus timing, asynchronous bus timing, and semi-synchronous bus timing. Physical characteristics of the bus, including electrical characteristics of signals, power, and addresses, as well as mechanical characteristics of wiring and connectors. Bus bandwidth, which is the maximum transmission rate achievable by the bus, with the unit being MB/S.

CSM Computer-Systeme plug types

Common data buses include ISA, EISA, VESA, PCI, etc. "Address bus AB" is specifically used to transmit addresses. Since addresses can only be transmitted from the CPU to external memory or I/O ports, the address bus is always unidirectional and tri-state, which differs from the data bus. The number of bits in the address bus determines the size of the memory space that the CPU can directly address. For example, if the address bus of an 8-bit microcomputer is 16 bits, its maximum addressable space is 2^16=64KB. The address bus of a 16-bit microcomputer (x-bit processor refers to the number of bits (1, 0) that the microprocessor can process in one clock cycle, i.e., the word length) is 20 bits, and its addressable space is 2^20=1MB. Generally speaking, if the address bus is n bits, the addressable space is 2^n bytes. "Control bus CB" is used to transmit control signals and timing signals. Among the control signals, some are sent by the microprocessor to memory and I/O interface circuits, such as read/write signals, chip select signals, and interrupt response signals; others are fed back to the CPU by other components, such as interrupt request signals, reset signals, bus request signals, and device ready signals. Therefore, the transmission direction of the control bus is determined by the specific control signal, and (information) is generally bidirectional. The number of bits in the control bus depends on the actual control needs of the system. In fact, the specific situation of the control bus mainly depends on the CPU. According to the method of data transmission, they can be divided into serial buses and parallel buses. In serial buses, binary data is sent bit by bit through a single data line to the destination device; parallel buses typically have more than 2 data lines. Common serial buses include SPI, I2C, USB, and RS232. According to whether the clock signal is independent, they can be divided into synchronous buses and asynchronous buses. The clock signal of a synchronous bus is independent of the data, while the clock signal of an asynchronous bus is extracted from the data. SPI and I2C are synchronous serial buses, and RS232 uses an asynchronous serial bus.

CSM Computer-Systeme plug usage precautions

Fieldbus is gradually being promoted in industrial sites. Many devices not only have traditional instrument functions but also possess fieldbus capabilities. In DCS, fieldbus is widely used. The following issues should be noted when using fieldbus: 1) Communication distance. Fieldbus communication distance generally has certain requirements. For example, PROFIBUS/DP at a rate of 12Mbps can reach 200m using standard cable. If a rate of 187.5kbps is used, it can reach 1 000m. Communication distance has two meanings: first, the distance achievable between two nodes without repeaters; generally, distance is inversely proportional to communication rate; second, the distance between the two farthest nodes in the entire network. Manufacturers' descriptions of this are often unclear in introductory materials. In actual use, the scope of the entire network must be considered. Electromagnetic wave signals take time to propagate through cables, especially in some high-speed fieldbuses. If the distance is increased, some communication parameters must be modified; 2) Cable selection. The site environment determines the communication speed and medium of the fieldbus. Generally, fieldbus uses electrical signals to transmit data, and is inevitably affected by the surrounding electromagnetic environment during transmission. Most fieldbuses use shielded twisted pair cables. It must be noted that different types of fieldbuses may require different shielded twisted pair cables. Fieldbus developers generally specify a special type of cable, and the specified rate and transmission distance can only be achieved under correct use of this cable. Under extremely poor electromagnetic conditions, optical fiber is a reasonable choice; otherwise, local interference may affect the operation of the entire fieldbus network; 3) Isolation. Generally, the electrical signals of the fieldbus are electrically isolated from the interior of the equipment. Fieldbus cables are distributed throughout the workshop. If high voltage intrudes, it will damage the bus transceivers of all devices in the entire network segment. If not isolated, the high voltage signal will continue to damage other circuits inside the equipment, leading to serious consequences; 4) Shielding. The outer layer of the shielded cable used in fieldbus must be grounded at one point. If high-frequency interference is severe, multi-point capacitive grounding can be used. Multi-point direct grounding is not allowed to avoid generating ground loop currents; 5) Connectors. Fieldbus generally does not have strict regulations for connectors, but improper handling will affect the communication of the entire system. For example, fieldbus generally uses a bus-type daisy chain connection method. When connecting each device, attention must be paid to how to insert and remove devices without affecting existing communication conditions, which places certain requirements on connectors; 6) Termination matching. Fieldbus signals, like all electromagnetic wave signals, exhibit reflection phenomena. Resistive matching should be used at both ends of each network segment of the bus. The first function is to absorb reflections, and the second is to achieve correct voltage levels at both ends of the bus to ensure communication. Therefore, fieldbus technology is the intersection and integration of control, computer, and communication technologies. Its emergence and rapid development reflect the requirements in the control field for reducing costs, improving reliability, enhancing maintainability, and increasing the intelligence of data acquisition.

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