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Hello Dipak,
RS-232 is a standard for serial communication transmission of data. It formally defines the signals connecting between a DTE (data terminal equipment) such as a computer terminal, and a DCE (data circuit-terminating equipment or data communication equipment), such as a modem. The RS-232 standard is commonly used in computer serial ports. The standard defines the electrical characteristics and timing of signals, the meaning of signals, and the physical size and pinout of connectors. The current version of the standard is TIA-232-F Interface Between Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange, issued in 1997.

You needs to do the Bachelors degree in nautical Science (B.Sc. Nautical Science) to start a career as a deck officer in the merchant navy. Below are the key details pertaining to B.Sc. (Nautical Science). Academic Qualifications: The candidate must have completed the Senior Secondary Examination (10+2) or its equivalent with: At least 60% marks in Physics, Chemistry, and Mathematics (PCM) and at least 50% marks in English either in Class X or Class XII. Age: Candidates, less than 25 years of age as on the 1st of August in the admission year will be eligible to apply. The date of birth recorded on the applicants School Leaving Certificate will be considered for this purpose. There is a relaxation of 5 years in the upper age limit for the SC/ST candidates. So from above you needs to do the B.Sc. Nautical Science and if meeting the above eligibility criteria than participate in IMUCET exam conducted by IMU.