Net-H/L Differential V Dominant (Switch Position 8); What Is "Dominant - Maretron N2KMeter User Manual

14 NET-H/L Differential V Dominant (Switch Position 8)

NET-H/L differential shows you the difference between NET-H and NET-L for dominant bits:
NET-H/L diff. V(D) = NET-HV(D) - NET-LV(D)
Display
Thresholds
Diff D Voltage High Fault
Diff D Voltage High Warning
Diff D Voltage Low Warning
Diff D Voltage Low Fault

14.1 What is "Dominant"?

messages consist of 1's and 0's. The dominant state of the bus (where the
®
NMEA 2000
differential voltage between NET-H and NET-L is around 2V) represents the logical value 0
(opposite from what you might expect). The bus can only be in the dominant state when a node
is actively transmitting.
N2KMeter measures the difference between NET-H and NET-L for dominant bits on the network,
and if the difference is not within acceptable limits, N2KMeter indicates a warning or a fault.
Revision 1.3
What it means
Minimum NET-H/L dominant voltage
differential since the N2KMeter was
plugged in or reset is 1.00V.
Maximum NET-H/L dominant voltage
differential since
plugged in or reset is 1.76V.
Dominant differential bus voltage can
not be measured because there is no
bus activity.
3.00V
2.75V
1.45V
1.20V
N2KMeter was
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