Xem 1-20 trên 73 kết quả Serial communications
  • Tài liệu tham khảo về 8051 SERIAL COMMUNICATION

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  • Serial Communication EIA RS232, RS422 and RS485 Recommended Standard 232. The purpose of this course note is to attempt to describe the main elements in Serial Communication. This application note attempts to cover enough technical details of RS232, RS422 and RS485. EIA - Electroonic Industries Associatio. Characteristics of Communication Systems Must be a Sender and Receiver A protocol is a set of rules which governs the transfer of data between computers. Protocols allow communication between computers and networks. Handshaking is used to establish which protocols to use.

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  • This chapter describe the fundamental concepts of point-to-point serial communication including TDM, demarcation point, DTE-DCE functions, HDLC encapsulation, and serial interface troubleshooting; configure PPP on a serial interface including enabling PPP encapsulation, verifying the PPP connection and troubleshooting encapsulation problems;...

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  • This chapter describe the fundamental concepts of point-to-point serial communication including TDM, demarcation point, DTE-DCE functions, HDLC encapsulation, and serial interface troubleshooting; configure PPP on a serial interface including enabling PPP encapsulation.

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  • Static NAT – Mapping an unregistered IP address to a registered IP address on a one-to-one basis. Particularly useful when a device needs to be accessible from outside the network.Dynamic NAT – Maps an unregistered IP address to a registered IP address from a group of registered IP addresses. Dynamic NAT also establishes a one-to-one mapping between unregistered and registered IP address, but the mapping could vary depending on the registered address available in the pool, at the time of communication....

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  • Computers make use of relatively short parallel connections between interior components, but use a serial bus to convert signals for most external communications.In a parallel connection, it is wrong to assume that the 8 bits leaving the sender at the same time arrive at the receiver at the same time. Rather, some of the bits get there later than others. This is known as clock skew.

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  • Point-to-Point Protocol. Objectives: In this chapter, you will learn to: Describe the fundamental concepts of point-to-point serial communication. Describe key PPP concepts. Configure PPP encapsulation. Explain and configure PAP and CHAP authentication.

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  • Parallel: In parallel transmission all bits in a single character are transmitted simultaneously. Data travels in parallel (simultaneously) within a PC over the data bus (bundle of data lines). Similarly we can transmit data between two PCs in parallel. That is all data lines (normally 8) from one PC are connected to the other PC. Parallel transmission is primarily limited to transmission of data within a computer, between computers and between a computer and a printer. It is fast compared to serial transmission but limited to shorter distances. ...

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  • An open data communication protocol developed in 1979 Published by Modicon Open structure Flexible Widely known Supplied by many SCADA and HMI software Have OPC Servers 2 serial transmission modes: ASCII 10 bits RTU (Binary) 11 bits Communication interface RS-232/485 Ethernet (TCP/IP) Station Device: 0 ~ 255 Digital input 1xxxx: 4 digits for hexadecimal address (0000 ~ FFFF) 1xxxxx: 5 digital for decimal address (0 ~ 65535) Digital output 0xxxx: 4 digits for hexadecimal address (0000 ~ FFFF) 0xxxxx: 5 digital for decimal address (0 ~ 65535) Analog input 4xxxx: 4 dig...

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  • In block coding, the encoder accepts kbit message block and generates n-bit codeword⇒Block-by-block basis  Encoder must buffer an entire message 2 block before generating the codeword  When the message bits come in serially rather than in large blocks, using buffer is undesirable  Convolutional coding

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  • UNIX has always had a high level of support for serial lines, but their purpose has changed dramatically. In the early 70s, the standard ‘‘terminal’’ was a Teletype KSR35, a 10-character-per-second serial printer with keyboard. Early UNIX serial line support was geared towards supporting these devices, either directly connected, or via a modem.

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  • In this chapter, you will be able to: Explain the fundamentals of point-to-point serial communication across a WAN, configure HDLC encapsulation on a point-to-point serial link, describe the benefits of using PPP over HDLC in a WAN, describe the PPP layered architecture and the functions of LCP and NCP,...

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  • The purpose of this lesson is to show you how you can do socket programming in C#. Network programming in windows is possible with sockets. A socket is like a handle to a file. Socket programming resembles the file IO as does the Serial Communication. You can use sockets programming to have two applications communicate with each other.

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  • The only system which is truly secure is one which is switched off and unplugged, locked in a titanium lined safe, buried in a concrete bunker, and is surrounded by nerve gas and very highly paid armed guards. Even then, I wouldn’t stake my life on it….An open security model is the easiest to implement . Simple passwords and server security become the foundation of this model. If encryption is used, it is implemented by individual users or on servers.

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  • The Data-over-Cable Service Interface Specification (DOCSIS)is an international standard developed by CableLabs, a non-profit research and development consortium for cable-related technologies. • DOCSIS specifies the OSI Layer 1 and Layer 2 requirements: Physical layer-For data signals that the cable operator can use, DOCSIS specifies the channel widths (bandwidths of each channel) as 200 kHz, 400 kHz, 800 kHz, 1.6 MHz, 3.2 MHz, and 6.4 MHz. DOCSIS also specifies modulation techniques (the way to use the RF signal to convey digital data).

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  • Establishing a network performance baseline requires collecting key performance data from the ports and devices that are essential to network operation.1 Gather symptoms - Troubleshooting begins with the process of gathering and documenting symptoms from the network, end systems, and users. Stage 2 Isolate the problem - The problem is not truly isolated until a single problem, or a set of related problems, is identified.

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  • Limit network traffic to increase network performance. For example, if corporate policy does not allow video traffic on the network, ACLs that block video traffic could be configured and applied. This would greatly reduce the network load and increase network performance. 2. Provide traffic flow control. ACLs can restrict the delivery of routing updates. If updates are not required because of network conditions, bandwidth is preserved. 3. Provide a basic level of security for network access.

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  • Frame Relay has become the most widely used WAN technology in the world. Large enterprises, governments, ISPs, and small businesses use Frame Relay, primarily because of its price and flexibility. •Moreover, Frame Relay provides greater bandwidth, reliability, and resiliency than private or leased lines. •Frame Relay reduces network costs by using less equipment, less complexity, and an easier implementation.

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  • Serial communications is sufficiently complex that special chips have been designed to do the work of forming and timing the strings of bits that comprise serial data. Such a chip is called a universal asynchronous receiver transmitter or UART. Without UARTs, communications programming would be very complicated. The IBM family of microcomputers use the Intel 8250 UART. The Intel 8250 is a programmable Universal Asynchronous Receiver/Transmitter packaged in a 40- pin integrated circuit. ...

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  • Frame Relay. Objectives: In this chapter, you will learn to: Describe the fundamental concepts of Frame Relay technology in terms of enterprise WAN services, including operation, implementation requirements, maps, and Local Management Interface (LMI) operation. Configure a basic Frame Relay permanent virtual circuit (PVC), including configuring and troubleshooting Frame Relay on a router serial interface and configuring a static Frame Relay map.

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