I am wondering how fundamentally the tether communication works?
When we press the key (W) on keyboard, the port and starboard motors start to run.
what kind of control signal is generated and pass over the tether cable from the Topside adapter to the homeplug adapter on the ROV?
It is definitely not sending different DC voltages as I measure the voltage across the two tether cables, it gives me a constant voltage of 4.4~4.5V. So it could be a small AC signal? As I cannot visualize any changes in terms of AC voltage using a multi-meter.
Is this some sort of power line communication stuff?
Could you explain in both microscopic (such as EM waves, Current, RF and etc) and macroscopic (such as coding, architecture) point of view?
The cat5 cable has 4 wires (Transmit+/- and Receive+/-) and the network has only two wire (Tether A and B). what kind of signal is running through the tether cable? Is it some sort of electrical pulses? Any waveform diagrams? I really would like to imagine what do those network signals look like?
Could you show me the difference between the network signals for turning the internal LED on and turning the motor on? each key has an associated plugin, but what do those plugins do in terms of signal generation?