but that doesn't seem to do anything
The other thing to consider is the1K seriese resistor in line with the RX data. You might have to remove this on the second arduino to disconnect it from the USB chip.
but that doesn't seem to do anything
The other thing to consider is the1K seriese resistor in line with the RX data. You might have to remove this on the second arduino to disconnect it from the USB chip.