I connected 2 propeller boards together through a single wire. One prop is configured as an output and the other as an input. The output prop is showing programmatically that the output is changing but the input prop pin is not registering the change. This is a relatively slow changing output and although both props run at different oscillator speeds, this should not make a difference. I tried using a resistor to ground on the line but that didn't make a difference. I have verified multiple times that the ports are both configured properly. I ran out of ideas of what to check for?