A NMEA 2000 Device with a LEN of 5 is equal to?

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Enhance your knowledge of NMEA 2000 standards. Study with interactive questions, hints, and explanations, tailored to gear you up for the exam. Excel in marine electronics!

Multiple Choice

A NMEA 2000 Device with a LEN of 5 is equal to?

Explanation:
On NMEA 2000, devices declare a Load Equivalence Number (LEN) that shows how much current they draw from the 12‑V backbone. Each LEN equals 50 mA. So a device with LEN 5 draws 5 × 50 mA = 250 mA. That’s why 250 mA is the correct answer. The other values would correspond to different LENs (100 mA would be LEN 2, 500 mA would be LEN 10, and 125 mA would imply a non-integer LEN, which isn’t possible since LENs are whole numbers). The total current on the bus is the sum of all device LENs, so budgeting the LENs keeps the network powered properly.

On NMEA 2000, devices declare a Load Equivalence Number (LEN) that shows how much current they draw from the 12‑V backbone. Each LEN equals 50 mA. So a device with LEN 5 draws 5 × 50 mA = 250 mA. That’s why 250 mA is the correct answer. The other values would correspond to different LENs (100 mA would be LEN 2, 500 mA would be LEN 10, and 125 mA would imply a non-integer LEN, which isn’t possible since LENs are whole numbers). The total current on the bus is the sum of all device LENs, so budgeting the LENs keeps the network powered properly.

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