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Which of the following is a device that provides local communication between the datalogger and a computer?

A.
Controllerless modem
Answers
A.
Controllerless modem
B.
Optical modem
Answers
B.
Optical modem
C.
Acoustic modem
Answers
C.
Acoustic modem
D.
Short haul modem
Answers
D.
Short haul modem
Suggested answer: D

Explanation:

A short haul modem is a device that provides local communication between the datalogger and a computer with an RS-232 serial port. It transmits data up to 6.5 miles over a four-wire unconditioned line (two twisted pairs).

Answer option B is incorrect. An optical modem is a device that is used for converting a computer's electronic signals into optical signals for transmission over optical fiber. It also converts optical signals from an optical fiber cable back into electronic signals. It provides higher data transmission rates because it uses extremely high capacity of the optical fiber cable for transmitting data.

Answer option C is incorrect. An acoustic modem provides wireless communication under water. The optimum performance of a wireless acoustic modem system depends upon the speed of sound, water depth, existence of thermocline zones, ambient noise, and seasonal change.

Answer option A is incorrect. A controllerless modem is a hardware-based modem that does not have the physical communications port controller circuitry. It is also known as WinModem or software modem. A controllerless modem is very inexpensive and can easily be upgraded with new software.

asked 18/09/2024
mark linde
30 questions
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