National Marine Electronics Association (NMEA) 2000 Practice Test

These questions are part of the practice quiz. Start practicing

• Which gauge combination correctly describes the Heavy cable's power and signal/data gauges?
• The purpose of termination resistors in an NMEA 2000 backbone is:
• What is the power wire gauge of a heavy cable?
• What is the difference between a loopback test and a full network test on NMEA 2000?
• True or False? If you are using multiple power Tees, the Shield / Drain connection should be connected to the non-current carrying RF Ground system at only one location.
• What distinguishes a PDU1 PGN from a PDU2 PGN, and how does that affect addressing?
• Proper bus power design requires calculations to ensure devices are getting adequate power.
• Using Lite Cable with LEN 8 and Backbone Length 4 meters, what is the voltage drop?
• The NMEA 2000 backbone data rate is 250K bits per second.
• Why is it important to follow installation guidelines for NMEA 2000 cabling and networking?
• What is the max backbone length for a lite cable?
• Which installation example would require device instancing?
• Which statement is NOT true about lite cable?
• Interconnection of an NMEA 0183 device with an NMEA 2000 backbone requires the use of a certified NMEA 2000 gateway.
• Which component is used to connect devices to the NMEA 2000 backbone?
• The NMEA 2000 Mid cable connectors can be Field Attachable, Mini, Micro, or All of the above.
• True or False? When a Voltage Drop calculation shows that an end-powered NMEA 2000® backbone will exceed the allowable voltage drop only by 0.1 volts, the installer can move higher LEN devices toward the power tee.
• Devices furthest from power insertion point will generally experience lower voltage.
• Which power considerations are important when designing an NMEA 2000 network?
• Which gauge combination correctly describes the Mid cable's power and signal/data gauges?
• The backbone must be terminated at both ends with resistors.
• NMEA 2000 devices with other electrical interfaces have internal isolation between device power and network power.
• Which statement about mid cable specifications is correct?
• Which statement correctly differentiates standard PGNs from proprietary PGNs?
• How can you determine whether a PGN on the network is a standard/public PGN or a manufacturer proprietary PGN?
• Why might you choose to add a repeater or isolator in an NMEA 2000 network?
• In NMEA 2000, what is the role of a talker device?
• What is the practical approach to verify that a PGN is being published by a talker device on the network?
• What is the physical topology used by NMEA 2000?
• Which statement accurately describes PDU2 PGNs?
• Power Tee usage to feed all devices on a NMEA 2000 backbone is:
• How do static PGNs differ from dynamic PGNs?
• Which description best matches the Gateway's function?
• What is the connector type for a lite cable?
• Which statement describes the relationship of Heavy and Mid cables in terms of their power and signal gauges?
• Which statement is true about adjusting the voltage drop when the calculation shows an excess of 0.1 volts?
• A NMEA 2000 Device with a LEN of 5 is equal to?
• Which statement is TRUE about certification?
• What is the purpose of an address claim process on an NMEA 2000 network?
• When viewing NMEA 2000 data you must use the following:
• What is the max drop length of a lite cable?
• What does SOG stand for, and what does it measure on an NMEA 2000 network?
• NMEA 2000 devices with other electrical interfaces have internal isolation to separate the device power from the network power.
• NMEA 2000 PGNs are a series of numbers and letters that describe the data coming from a particular device on the network.
• The NMEA 2000 Mid cable can use which of the following connectors?
• The data wire gauge of a heavy cable is 18 AWG.
• Explain the difference between talker devices and listener devices on an NMEA 2000 network.
• Complete the following voltage drop calculation LEN=32 Backbone Length= 26 Cable Type= Mid. The result is:
• What is the significance of PGN catalogs and device data sheets for network planning?
• The resistance per meter of lite cable is approximately what value?
• The maximum voltage drop for an NMEA 2000 network powered from the battery is:
• In NMEA 2000 Mid cable, which gauges are used for the power and signal/data pairs, respectively?
• True or False? When using a NMEA 2000 Gateway to bring NMEA 0183 data onto the network, the NMEA 0183 device will show up as a connected device on the network.
• The maximum voltage drop from the battery source to the power insertion point is:
• Which statement best describes time synchronization in NMEA 2000 networks?
• What is the maximum backbone length for Mid cables?
• How would you update firmware on NMEA 2000 devices, and what precautions should you take?
• LENs range from 1-20.
• Which formula is used to calculate voltage drop on the NMEA 2000 network?
• To obtain a 60 Ohm meter reading between the blue and white NMEA 2000 data wires, power to the network must be OFF.
• What is the signal/data wire gauge for Lite Cable?
• How does PF value affect PGN addressing in NMEA 2000?
• What is the current capacity of a heavy cable?
• Why are terminators used on an NMEA 2000 CAN bus and where should they be placed?
• Which statement about the maximum number of devices on a single NMEA 2000 network is correct?
• NMEA 2000 backbones should have termination resistors connected to which of the following?
• Which color pair on NMEA 2000 cables is used for data signaling on the backbone?
• In a properly terminated NMEA2000 network and the power to the network off, the resistance reading between NET-H & NET-L should be:
• NMEA 2000 network termination is provided by connecting which resistors?
• What is the data wire gauge for a mid cable?
• When installing a NMEA 2000 network using bulk cable pulled from a spool, which component must be installed?
• Instance numbers are changeable.
• The maximum length for an NMEA 2000 backbone consisting entirely of Lite Cable is:
• Which action is inappropriate when updating firmware on NMEA 2000 devices?
• A NMEA 2000 backbone Tee has two connectors on the backbone: _______ and _______, and a third _______ connector for the drop.
• If you are connecting additional devices to the NMEA 2000 backbone and the network power is ON, these new devices will not communicate with the existing devices on the network until you re-cycle the power.
• Name a method to manage network load when many devices publish high-frequency data.
• What is the max drop length of a mid cable?
• LEN stands for Load Equivalency Number.
• What is the maximum backbone length for Lite cables?
• What physical topology does NMEA 2000 use, and what must be installed at the ends of the backbone?
• Which statement best describes how NMEA 2000 differs from NMEA 0183?
• Per the NMEA 2000 standard, Instance numbers are pre programmed by the manufacturer and cannot be changed.
• The maximum voltage drop allowed from the battery source to the power insertion point is:
• What is the cable resistance of a heavy cable?
• Which statement best describes the function of a gateway device on an NMEA 2000 system?
• Which of the following statements regarding Bus Power for a NMEA 2000 Backbone is false?
• In typical NMEA 2000 network layouts, the backbone is powered from one end.
• What gauge is used for the signal pair on Heavy NMEA 2000 cable?
• Which connector type is used for a heavy cable?
• The backbone of an NMEA 2000 network is typically made of what type of cable?
• What are the three cable types?
• In a voltage drop calculation for a small network using Lite Cable with Backbone Length 20 meters and LEN 11, what is the voltage drop?
• What is the cable resistance of a lite cable?
• Which data types would you commonly find on an NMEA 2000 network?
• What is the data rate of the NMEA 2000 backbone?
• The NMEA 2000 backbone Tee drop connector is designed as which gender?
• What end-to-end bus resistance value is typical when terminators are correctly installed?
• Which data category would include engine RPM and coolant temperature in NMEA 2000 PGNs?
• What is the purpose of diagnostic PGNs such as 65240?
• True or False? If you are using multiple power Tees, the Shield / Drain connection should be connected to the non-current carrying RF Ground system at only one location.
• What is the maximum backbone length for Heavy cables?
• Which wattage rating is used for NMEA 2000 termination resistors?
• What does node addressing enable on an NMEA 2000 network?
• What does data age mean in NMEA 2000 PGNs and why is it important?
• What is the maximum number of Virtual Devices (Virtual Nodes) that can be connected to a NMEA 2000 backbone?
• Which statement is true about backbone lengths for the three cable types?
• Which statement best describes a PDU1 PGN?
• True or False: Micro and Mini connectors have the same pin configuration.
• What is the current capacity for a lite cable?
• The maximum network voltage drop for an NMEA 2000 network powered from a regulated DC Power Supply is:
• What is the default function of gateways/routers in a redundant NMEA 2000 network?
• What is the power wire gauge for a lite cable?
• What is the basic messaging unit in NMEA 2000?
• Which statement best describes the role of terminators in the NMEA 2000 trunk-and-drop topology?
• Which condition signals that a PGN is a global broadcast rather than destination addressed?
• Which statement is true about backbone lengths for mid and heavy cables?
• What is the correct power and signal gauge pair for the Heavy cable?
• What is the role of an NMEA 2000 'foundation device,' and provide an example?
• NMEA 2000 connectors use how many pins?
• What is the maximum voltage drop when the network is powered from the battery?
• What is the role of a gateway in integrating NMEA 2000 with other networks?
• What is the maximum drop length of a heavy NMEA 2000 cable?
• True or False? If you are using a NMEA 2000 Gateway to bring NMEA 0183 data onto the network, the NMEA 0183 device will show up as a connected device on the network.
• Which value is associated with the mid cable's data wire gauge?
• Which of the following is true about a device with LEN of 5?
• The maximum number of Virtual Devices (Virtual Nodes) that can be connected to an NMEA 2000 backbone is___.
• When termination resistors are connected at the wrong locations, the voltage drop in the power leads NET-S and NET-C will be:
• For a network with five devices totaling LEN 14 on a 30-meter heavy cable backbone powered from one end, what is the estimated voltage drop?
• The maximum voltage drop for an NMEA 2000 network powered from the battery is:
• What is a practical first step when a device becomes non-responsive on a NMEA 2000 network?
• NMEA 2000® connectors have how many pins?
• How can you classify PGNs to plan data flow on an installation?
• Which practical step directly verifies the end-to-end bus resistance with terminators in place?
• What gauge is used for the signal/data pair on Mid NMEA 2000 cable?
• What physical signaling lines carry the CAN data on an NMEA 2000 network?
• What is the maximum current in any leg of an NMEA 2000 backbone using Heavy Cable?
• Define a PGN in NMEA 2000 and describe its two main components.
• The shield / drain wire is connected to the NMEA 2000 network common reference ground at only one power supply location.
• When termination resistors are connected at the wrong locations, the voltage drop in NET-S and NET-C power leads will be
• What is the data wire gauge of a heavy cable?
• Which statement correctly describes the maximum backbone lengths for Heavy, Mid, and Lite cables?
• In-Line Termination Resistors are typically used when:
• What is the primary purpose of the NMEA 2000 network in a marine installation?
• What is the cable resistance of a mid cable?
• The cumulative drop length to all devices on an NMEA 2000 network cannot exceed 78 meters.
• What is a manufacturer proprietary PGN, and when might it be used?
• The purpose of a Power Tee on a NMEA 2000 Backbone is:
• What is the max backbone length of a heavy cable?
• What is a PGN in NMEA 2000?
• What connector type is used for a mid cable?
• In a PDU1 PGN, what does the PS field contain?
• What connector type is used for a heavy cable?
• What gauge is used for the power pair on Mid NMEA 2000 cable?
• How does CAN arbitration influence which device's PGN is placed on the CAN bus when multiple devices transmit?
• What can be up to 100 meters in length on a NMEA 2000 backbone?
• Why is grounding and shielding important in a marine NMEA 2000 installation?
• In a properly terminated network with power off, what is the resistance reading between NET-H & NET-L?
• What is a key advantage of the CAN-based architecture used by NMEA 2000?
• What gauge is used for the power pair on Heavy NMEA 2000 cable?
• Which of the following represents the mid cable current capacity?
• If a display on the network has a LEN of 22, it can power itself entirely from the NMEA 2000 network power.
• A non NMEA 2000 device outputting engine data may be connected to a NMEA 2000 Display using the following:
• It is possible to disconnect a device without interrupting the backbone.
• NMEA 2000 network connections are made via which components to connect devices to the backbone?
• What is the current capacity of a mid cable?
• If devices are not firmware-compatible, what is a likely outcome for data exchange?
• What do PF and PS in NMEA 2000 PGNs determine?
• Is it possible for a single NMEA 2000 device to function as both a talker and a listener?
• In-Line Termination Resistors are typically used when:
• Which type of device typically acts as a gateway between NMEA 2000 and other networks, and what is its function?
• Which statement about lite cable is true?
• Why is the CAN bus speed set to 250 kbps in NMEA 2000, and what does this mean for data transfer?
• Per the NMEA 2000 standard, Instance numbers are pre programmed by the manufacturer and cannot be changed.
• Inline Termination Resistors are typically used when:
• How can NMEA 2000 be connected to older NMEA 0183 devices?
• What is the maximum number of physical devices that may be connected to a single NMEA 2000 network?
• If a device on the network uses a manufacturer proprietary PGN, how is this typically indicated?
• What is the purpose of a Node Address in NMEA 2000, and how is it used in communication?
• How does an NMEA 2000 network support redundancy for critical navigation data?
• Which statement is true about resistance values per meter?
• Which statement best describes device instancing when installing multiple identical devices on a NMEA 2000 network?
• What is the maximum cumulative length of all drop cables allowed in a NMEA 2000 network?
• True or False? An NMEA 2000® device may be powered entirely from the backbone power source if it has no electrical connections other than the NMEA 2000® interface.
• Which installation example would require device instancing?
• The voltage of the NMEA 2000 backbone power supply pair must be maintained to within which following range?
• The NMEA 2000 Mid cable can use which connectors?
• The relatively low price of CAN hardware used by NMEA 2000 is due to its use in which other industries?
• What is the function of a CAN transceiver in an NMEA 2000 device?
• NMEA 2000 network connections are made via T's and drops so that a device may be disconnected from the network without interrupting the backbone.
• The maximum current in any backbone leg using Heavy Cable is 8 amps.
• How would you approach interoperability when mixing devices from different brands on an NMEA 2000 network?
• Time stamping in PGNs helps in what way?