Can Signal Thresholds (Switch Positions 9-12) - Maretron N2KMeter User Manual

15 CAN Signal Thresholds (Switch Positions 9-12)

Thresholds:
Switch ,
NET-H/L R Voltage High Fault
NET-H/L R Voltage High Warning
NET-H/L R Voltage Low Warning
NET-H/L R Voltage Low Fault
Switch
NET-H D Voltage High Fault
NET-H D Voltage High Warning
NET-H D Voltage Low Warning
NET-H D Voltage Low Fault
Switch
NET-L D Voltage High Fault
NET-L D Voltage High Warning
NET-L D Voltage Low Warning
NET-L D Voltage Low Fault
®
NMEA 2000 messages consist of 1's and 0's, which are represented as differences in voltage
between the NET-H and NET-L wires. However, if the absolute voltage of the signal (measured
to the V- wire at any node) is too high or too low, bits may not be received correctly. The
N2KMeter measures each of the key NET-H, NET-L and Differential voltages, and if the readings
are too high or low, the N2KMeter indicates a warning or fault.
Display
&
&
Revision 1.3
8.50V
7.00V
-2.00V
-3.00V
10.00V
8.50V
-1.25V
-2.25V
7.75V
6.25V
-3.50V
-4.50V
What it means
Recessive bus voltage cannot be
measured because the bus is stuck
dominant (or CAN wires are flipped).
Dominant bus voltage cannot be
measured because there is no bus
activity.
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