Download 1. INTRODUCTION 1.1 PROBLEM DEFINITION The basic

Embedded Network Client & Data Acquisition System
by using Nokia F­Bus (Version ­2) protocols and to the modem by implementing IP and UDP. The entire protocol stack is implemented in the micro controller. LCD and Keypad Interface
LCD provides the display of the field data and other related information. The connection and status information can also be viewed. The Keypad makes the LCD menu driven thus providing the basic functions like scrolling through the sensor data to selection of the transfer mode.
UART Multiplexing and Level Conversion
The micro controller provides only one serial asynchronous communication port. Now to communicate with more than two serial devices we have done multiplexing of the serial port. After selection of the device by controlling the multiplexer the Uart level is converted to RS­232 standard so that it can be interfaced to the GSM module and dial up modem.
3.1.2 External Peripherals
LCD 16X2
Keypad 4 key
GSM Module (Nokia / Siemens)
Dial up Modem (Zoltrix)
© Copyright 2004 Defense Research & Development Organization (DRDO), India
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