Remote Information Validation & Display (RIVD) System Development
By
E.N.
Batuwangala
The
objective of the project is to read a number from a terminal, which is located
at a remote point, and subsequently validate the number by accessing a database
in a central computer. A message is then relayed to the display in the remote
terminal depending on the validity of the number. The design also caters for
multiple terminals linked to the central computer using modems depending on the
distance.
The
receiving path consists of a 4x4 keypad, which is used to enter the number, and
the number is then coded into its respective binary format. This encoded
information routes via an UART to a RS232 level converter, thus dispatching it
to the communication port of the computer where the validation process is taken
place.
The
transmitting path consists of a link to UART from the central computer and
subsequently to a LCD, which displays the number validated and respective
message.
The
design comprises of two phases:
1.
Design of the RIVD, its PCB layout and construction.
2.
Writing of the programs
in Visual Basic to read remotely entered numbers and to display a message in the
remote LCD.