mobile phone. The project consists of a circuitry with Microcontroller AT89c51 (MCU) and GSM modem in a vehicle and a GSM handset for Owner. The circuitry is constructed on the base of MCU which is assembled with Max-232 for the interface between MCU and GSM modem. Max-232 is a level converter used for the interface between the TTL and non TTL devices.Max-232 act as a bridge between the MCU and the GSM modem. Relays are used for the activating and deactivating the alarm and the locking system of the
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Electronic Home Appliance Device and Power Supply 2.10 Components list of gsm based home appliance device CHAPTER THREE: DESIGN AND CONSTRUCTION 3.1 GSM Modem 3.1.1 Accessing GSM MODEM using Microsoft HyperTerminal 3.2 Testing of GSM Modem 3.3 List of Important AT Commands 3.4 Microcontroller – MODEM Interfacing 3.4.1. DTE and DCE 3.4.2. RS-232 3.4.3. RTS/CTS Handshaking 3.4.4. Specifying Baud Rate‚ Parity & Stop bits
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Section 1 Introduction 1.1 COMMUNICATIONS Computer communications is the process of sharing data‚ programs‚ and information between two or more computers. We have discussed numerous applications that depend on communication systems‚ including: • E-mail – Provides a fast‚ efficient alternative to traditional mail by sending and receiving electronic documents. • Instant messaging – Supports direct‚ “live” electronic communication between two or more friends or buddies. • Internet
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CHAPTER 1 INTRODUCTION More than 93 percent of car thefts occur in metropolitan areas where motor vehicle theft remains a pervasive problem. Western states‚ in particular‚ experience high rates of motor vehicle theft‚ while nationally a car or truck was stolen every 28.8 seconds. The FBI Uniform Crime Reports released an estimate 1.1 million motor vehicle thefts‚ with an estimated value of $7.4 billion. A new international Interpol Statistics revealed
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and inserts it into a fax machine. The fax machine converts the text on the paper to a digital form. The modem in turn‚ converts it to analog. The Class 5 switch at the local exchange converts it to analog. At the other end‚ his friend via the receiving Class 4 switch converts it to digital. The Class 5 switch at the receiving end local exchange‚ converts it to analog. . The friend’s modem converts it to digital‚ and finally the receiving friend’s fax machine prints it out onto paper which is
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energy supply sector. Power line communication has many new service possibilities on the data transferring via power lines without use extra cables. AMR is a very important application in these possibilities due to every user connected each other via modems using power lines. AMR is a technique to facilitate remote readings energy consumption. Improving the electrical power supply to households as a big issue. The government has set a specific goal to raise the distribution rate of electrical power
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DATA COMMUNICATIONS 10-1 Communication Basics Computer communications is at three levels – Application level – Computer level – Communication channel Protocol – Set of rules for communications – OSI Standard 10-2 OSI Reference Model Layer 7 6 5 4 3 2 1 Name Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer Purpose Application-to-application communication Manage data representation
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Access- A broad term for the many technologies that can be used to connect to an ISP so that the device or network can send packets between itself and the device. 6. Analog Modem- A device at the customer and ISP end of an analog circuit‚ created when one modem calls the phone number of the other modem‚ with the two modems sending data using the analog circuit. 7. DSL- A type of internet access service in which the data flows over the local loop cable from home to the telco central office‚ where
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Warwick Institute of Australia Diploma of business BSBIT501A-DB4 Assessment task 2 Student ID 001055 Hai Lin 05/02/2015 Job Name Date Helpdesk technician Marilyn Monroe 26/01 11:30 am IT assistant Mother Teresa 27/01 11:30 am Support technician Winston Churchill 28/01 11:30 am Computer workgroups need to be scalable. Scalability is the ease at which a network system can be expanded or upgraded should the need arise. As a rule‚ all computer workgroup networks should: Support growth in the
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that the network is down. This office consists of seven computers connected to a router‚ which is connected to a cable modem. Answer the following question: What are the first three things Chris should check? Considering that all seven computers are linked to one router which is connected to one cable modem‚ I would first check the cable modem. The cable modem would show lights for connectivity and power. I would make sure that is plugged in and has internet connection. I would
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