I'm messing around with the idea of transmitting serial between two Microcontrollers using power as the means of transmitting. After some research I've come up with potentially the MCP201 LIN Transceiver however I have a question for you Guru's.
https://www.farnell.com/datasheets/47858.pdf
On the Master MCP201 it talks about using a 1K pullup resistor on the LIN Bus. I was under the impression this solution would communicate over the GND wire but a 1K pulllup resistor to LIN (assuming LIN was GND) in say a 24V setup would end up pulling an unreasonable 24mA. So am I right in thinking the LIN Bus works on the + power cable?
And if it is the + side what would a 1K pullup resistor do, especially after a diode which would loose ~0.4v before the resistor and the LIN Bus would be up at + anyway?
Thanks in advance
https://www.farnell.com/datasheets/47858.pdf
On the Master MCP201 it talks about using a 1K pullup resistor on the LIN Bus. I was under the impression this solution would communicate over the GND wire but a 1K pulllup resistor to LIN (assuming LIN was GND) in say a 24V setup would end up pulling an unreasonable 24mA. So am I right in thinking the LIN Bus works on the + power cable?
And if it is the + side what would a 1K pullup resistor do, especially after a diode which would loose ~0.4v before the resistor and the LIN Bus would be up at + anyway?
Thanks in advance