Serial port interfacing maybe for many of us is nightmare. Its can be uderstandd because in serial port interfacing out of data nature, i means in serial port interfacing data didnot came out as a pararel data but in serial data. But serial data communication become backbone ini nowadays digital comunication. So to help good understanding about serial port interfacing we could learn it with simple communication project, such of connecting two computer via null modem serial port interfacing.
We must understand in purpose make null modem serial port interfacing, ind program firstly we must define:
1. Speed of rate ( or baud rate of serial port interfacing)
2. we must define whom com port is being used (example com1, 2 etc)
Wiring circuit for null modem serial port interfacing
Figure below show null modem serial port interfacing with db25P connector. Maybe its quite old but its still backbone of the serial communication nowdays.
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