German Datalogic plug Datalogic model Datalogic price

Datalogic plug refers to the interface between the central processing unit and the standard communication subsystem. For example: RS232 interface. The RS232 interface is a serial port. Data transmission between computers or between a computer and a terminal can use two methods: serial communication and parallel communication. Serial communication is widely adopted because it uses fewer lines, has low cost, and avoids inconsistencies in multiple line characteristics, especially during long-distance transmission. In serial communication, both communicating parties are required to use a standard interface so that different devices can be conveniently connected for communication. The RS-232-C interface (also known as EIA RS-232-C) is the most commonly used serial communication interface. It was established in 1970 by the Electronic Industries Alliance (EIA) together with the Bell System, modem manufacturers, and computer terminal manufacturers as a standard for serial communication. Its full name is "Technical Standard for Serial Binary Data Exchange Interface between Data Terminal Equipment (DTE) and Data Communication Equipment (DCE)." This standard specifies a 25-pin DB25 connector, defines the signal content for each pin of the connector, and specifies the voltage levels for various signals.

Datalogic plug introduction

As automation technology has evolved from standalone machine control to factory automation FA and then to system automation, the factory automation information network can be divided into the following three-layer structure: factory management level, workshop monitoring level, and field device level. The fieldbus is the communication network between bottom-level devices in the factory. Here we first introduce Ethernet, specifically industrial Ethernet. Industrial Ethernet is an industrial network protocol derived from the office automation domain; by convention, it mainly refers to the IEEE 802.3 protocol. If the TCP/IP protocol suite is further adopted, it is expressed as "Ethernet + TCP/IP". Its technical characteristics are mainly suitable for information management and information processing systems, and it has achieved great success in the IT industry. In the fields of information integration at the factory management level and workshop monitoring level, there are many successful cases of industrial Ethernet, and there are also many applications at the device layer where real-time performance is not strictly required. Due to the wide variety of fieldbuses and inconsistent standards, many people hope that Ethernet technology can penetrate the lower device layers and widely replace existing fieldbus technologies. Schneider Electric is an active advocate and practitioner of this idea, with a range of industrial-grade products already available and in practical application. However, since Ethernet cannot truly solve real-time and determinism issues, most field layers will still prefer fieldbus technology. Due to technological limitations and conflicts of interest among various manufacturers, the current situation of coexistence of multiple industrial bus technologies and continuous penetration of Ethernet technology will persist for some time. Users can choose the required solution based on technical requirements and actual conditions.

Datalogic plug classification

Buses can be divided into five major types according to function and specification: Data Bus (Data Bus): Transmits data that needs to be processed or stored back and forth between the CPU and RAM. Address Bus (Address Bus): Used to specify the address of data stored in RAM (Random Access Memory). Control Bus (Control Bus): Transmits signals from the microprocessor Control Unit (Control Unit) to peripheral devices. Expansion Bus (Expansion Bus): A bus for data communication between external devices and the computer host, such as the ISA bus and PCI bus. Local Bus (Local Bus): Replaces expansion buses for higher-speed data transmission. Among them, the Data Bus DB (Data Bus), Address Bus AB (Address Bus), and Control Bus CB (Control Bus) are collectively referred to as the system bus, which is what is commonly meant by "bus". In some systems, the data bus and address bus are multiplexed, meaning the signals on the bus represent data at certain times and address at other times; while in other systems, they are separate. The address bus and data bus of the 51 series microcontrollers are multiplexed, whereas the buses in general PCs are separate. The "Data Bus DB" is used to transmit data information. The data bus is a bidirectional tri-state bus, meaning it can transmit data from the CPU to memory or other components such as I/O interfaces, and can also transmit data from other components to the CPU. The bit width of the data bus is an important indicator of a microcomputer and is usually consistent with the word length of the microprocessor. For example, the Intel 8086 microprocessor has a word length of 16 bits, and its data bus width is also 16 bits. It should be noted that the meaning of "data" is broad; it can be actual data, instruction code, or status information, and sometimes even control information. Therefore, in practical work, what is transmitted on the data bus is not necessarily only data in the strict sense.

Datalogic plug selection factors

PC communication with smart devices mostly relies on RS232, RS485, Ethernet, and other methods, depending mainly 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 communication applications themselves, but most of these programs do not comply with ISO/OSI specifications, 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 relay by a "Master (Master)" device. This master device is usually PC, and only one master device is allowed in such a device network, with all others being Slave (Slave) devices. Fieldbus technology is based on the ISO/OSI model, has a complete software support system, and can solve problems such as bus control, collision detection, and link maintenance.

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