I'm having a problem with marine instrumentation on my N2K network. The entire network is single manufacturer, and after looking at the network with a multimeter, the Cerbo GX does not seem to be conforming to specification. Specifically, when the N2K network is powered down (Cerbo is still connected to the LiFePo bank, and powered), there is no resistance between the two data lines on the N2K bus. When the Cerbo is removed from the bus, there is the appropriate 60Ω resistance. When the Cerbo is powered down too, ie., BMS is shut down, then the 60Ω resistance is present as well.
The other manufacturer wants to see N2K certification for the Cerbo — does anyone know if this has been passed?
Does anyone know if the N2K adapter cable is trying to power the N2K bus? There is a fuse hacked into the N2K end of the cable, but I'm unsure if the device is trying to draw power or provide it.
Any advice appreciated.