The question comes up "How did you route the power, ground and LIN bus signals, on your LIN node board, thru
the Microchip MCP2021 LIN transceiver chip?"
My next door neighbor, the PCB designer, used the "rabbit out of the hat trick" by allowing three jumpers to be installed on the bottom side of the node board to connect both Ethernet connectors together. See picture below.
Without this trick, the whole project would have been in jeopardy because without the easy to connect Ethernet cables and the self powered slave nodes then the next alternative would have been the "unpowered" RS485 solution.
