ADD-ON MULTIPLEXER IN WIRE COMMUNICATION SYSTEM AND A COMPARITIVE STUDY
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PRESENTED BY :
VINUPRASAD O M

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ADD-ON MULTIPLEXER IN WIRE COMMUNICATION SYSTEM AND A COMPARITIVE STUDY WITH OLD TECHNIQUE
AN OVER-VIEW……..

 Conventional wire communication.
 What’s an ADD-ON multiplexer.
 Basic difference between Conventional and add-on multiplexer using wire communication.
 A comparative study.
 Basic principle and working.
 Positive results.
 Further improvements…..
• Conventional Wire-Communication :
Our Point of Interest
 Communicates between powered terminals via a main unit by changing the voltage signal between positive and negative.
 Uses On-Off control mechanism.
 Mainly used for lightning and air –conditioning purpose.
• Problems in Conventional Technique
 Speed is very low.
 Adding supplement wire to existing system is difficult.
 Impedance problem.
 With the Range of transmission increases, signal strength will vary.
 Reflection of signal in different units.
 For Normal Reception :-
 For Long-distance and Reflection :-
Add on Multiplexer.. [/b]
 Transmitter
 Receiver
 Waveform Correction
 Impedance Matching
• Conventional and add-on multiplexer using wire communication : Basic difference
 Conventional :-
 Wire communication using Multiplexer :-
• An Example
• Basic Principle & Working
 Block Diagram Representation of multiplexer module
 Main parts are :
Transmitter, Receiver, Waveform correction circuit, Constant current Circuit, CPU, Diode Bridge, Power Supply, RS485
Transceiver, Equipment, Main Unit Voltage Signal Receiver.
 Signal Inputting at RS485 Equipment.
 Receiver communicate by receiving Voltage Drop Signal.
 In Constant Current Circuit, the current that accompanies the voltage signal from Transmitter is supplied from Main Unit.
 Waveform Correction Circuit is used to Prevent the signal from Distortion due to Long distance Transmission and Reflection.
Transmission Circuit :-
• Const. I Circuit- Amp+Trans.
• Volt. Drop- I from main unit & Impedance of line.
 Transmission Waveforms :-
 Reception Circuit :-
 Reception Waveform :-
• Receive Volt. Drop as signal.
• Trigger at Rising edge.
• UART(Universal Asynch. Rxr.Txr.)
 Waveform Correction :-
• Multiplexer send 40 bit data with a T=1ms, divide data as shown :
• To start communication as UART start bit “0” and stop bit “1”.
• 34 different possibilities of data conversion.
• Communication speed of UART is 156.25 kbps.
• For 1bit, 6.4μs.
• For 100 bit, it’s 640μs. (40 bit become 100bit)
Data Conversion Table :-
• 32 kinds of data are used as Data Codes.
• Remaining two kinds are :
1) Packet Start (Start Code)
2) Packet End (End Code)
• Each packet having 10 bit Length.
Positive Results
 Speed can be improved to several kbps, in on-off switching communication network.
 There is no additional wire connection, conventional wire connections are only required.
 Impedance problems can be avoided.
 Reflection of signal can be minimized by using this technique.
 The signal strength variation is reduced by using add-on multiplexer.
 From Analysis and measuring :
• communication distance = 1000m
• Switch and relay on opposite ends of communication line.
• Moving Multiplex module (Reception) and note the signal amplitude at each point.
Graphical Representation :
• High amplitude at 0 point. This is because the impedance of communication line is high.
• At 500m amplitude will be small, since impedance of communication line is small.
• Speed of communication can be improved.
• Long distant transmission and Reflection problem can be reduced by this method.
• Within the power lines this communication can be possible. No need for external wire connection.
Further Improvements….
 Using repeater modules in this system.
 It can be modified by taking two or more terminals.
 In addition, an extra degree of flexibility can be obtained by using emerging technologies.
Conclusion..
Here proposed a new signal multiplex technique that connects a multiplex module to an existing system and enables the multiplex module to communicate with the existing system. In the transmission state, a voltage drop is caused by the supply current from the main unit and the impedance of the communication line. The reception terminal receives the voltage drop as a signal. The communication signal waveform is distorted by the reflection of the signal. Therefore, the multiplex module has a waveform correction circuit that uses a one-shot timer. Moreover, here measured and analyzed signal amplitude. The resulting measurement data and analysis data corresponded well.
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