Subelement N: N – Marine— Topic 89: NMEA Data
Question 3-89N1
Element 3 (GROL)What data language is bi-directional, multi-transmitter, multi-receiver network?
Explanation
NMEA 2000 is a modern, robust marine data network standard built upon the Controller Area Network (CAN) bus. This architecture inherently supports multiple devices simultaneously transmitting and receiving data on a single shared bus. Each device on the network can act as both a transmitter and a receiver, making it truly bi-directional and multi-master.
In contrast, NMEA 0183 (and its predecessors 0181, 0182) uses a simpler serial communication protocol. It is typically a "one talker, multiple listeners" system, where a single device transmits data on a pair of wires to one or more receiving devices. While some bi-directional communication is possible, it generally requires dedicated point-to-point connections or complex multiplexing, and does not support the multi-transmitter, multi-receiver network topology of NMEA 2000.
Related Questions
3-88N5 Which of the following is the primary frequency that is used exclusively for NAVTEX broadcasts internationally?3-88N6 What determines whether a NAVTEX receiver does not print a particular type of message content?3-89N2 How should shielding be grounded on an NMEA 0183 data line?3-89N3 What might occur in NMEA 2000 network topology if one device in line should fail?3-89N4 In an NMEA 2000 device, a load equivalence number (LEN) of 1 is equivalent to how much current consumption?