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Study on Special MODEM Used in Industrial Control Network

Author: CaoPeiZuo
Tutor: DongJingZuo
School: Harbin University of Science and Technology
Course: Communication and Information System
Keywords: MODEM 16FSK digital waveform generating MACH445
CLC: TN915.05
Type: Master's thesis
Year: 2007
Downloads: 19
Quote: 0
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Abstract


With the development of technology of computer network, the remote data communication in the industrial control network is becoming more and more frequent. When the communicating distance of industrial control network is over 1.2km, the general serial buses, such as RS-232C and RS-485, can not meet the demand of system. Aiming at characteristics of industrial control network, associated with the original circuit system structure, this thesis studies a high- speed MODEM in the modulating method of 16FSK. Within the transmission band of telephone line, an average transmission rate of 18.9kbps can be achieved without data compaction. The MODEM studied in this thesis has no carrier without transmitting data. Just like on the RS-485 network, direct parallel can be realized on many equipments, the structure of original industrial control network need not to be modified.This thesis introduces the development and category of MODEM, analyzes the theory and method of digital waveform generating and calculating methods of sine wave data in details. N points of a periodic sine wave are sampled and stored in an EPROM after being quantized. Driven by 1MHz clock, the increased counter outputs the address and reads the data of sine wave in the EPROM in turn. After the transmission of D/A converter, accurate analog voltage of sine wave can be achieved by band-pass filter. Using the same clock frequency, the different sine wave can be achieved by changing the sampled points N. Power supply of the MODEM module designed in the thesis is provided by STD bus. Data port operating in asynchronous half-duplex mode is the three-line RS-232C (TXD, RXD and GND). Hardware circuits contain demodulation and modulation chiefly. There are serial port interface circuit, waveform data memory circuit, digital wave composition circuit in the modulation part, and counting and wave shape circuit, demodulation circuit in the demodulation part. MSP430F149, super low-power dissipation 16 bit MCU, is used as CPU, PLA MACH445, DAC0800 and PAL16V8 etc. are used as interface chips. This thesis introduces the basic principle of hardware circuit in details, and provides the principle diagram of each part of circuit, inside circuit diagrams of MACH445 and PAL16V8. The software of MODEM module designed in the thesis contains master program, serial port receive interruption subroutine, data transmitting interruption subroutine and so on.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication network > General issues > Communication network equipment
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