Power and serial communication scheme
A power and data communication system including an inboard computer system that includes a resistor network, an outboard computer system that includes at least one current limiter and voltage limiter that receives power from the inboard computer in order to power electronics of the outboard computer, and first and second wires connecting the resistor network of the at least one current limiter.
1. A method of communicating power and data between an inboard computer and an outboard computer, the method comprising:
driving, by the inboard computer, a power signal through an resistor network;
receiving, by the outboard computer, the power signal
powering a processor of the outboard computer using the received power signal; and
generating a serial control signal by the outboard computer in order to activate a switch responsible for pulling down a voltage feed, wherein the power signal is received by a pair of parallel current limiters.
2. The method of claim 1 , wherein further comprising powering a voltage regulator using a steering diode.
3. The method of claim 2 , further comprising forward biasing the steering diode.
4. The method of claim 1 , further comprising powering a hold up capacitor using the received power signal.
5. The method of claim 1 , further comprising monitoring by the in board computer a voltage drop across the resistor network.
6. The method of claim 1 , wherein the voltage across the resistor network is kept below a spark producing condition in a flammable environment.
7. A power and data communication system comprising:
an inboard computer system that includes a resistor network;
an outboard computer system that includes voltage limiter that receives power from the inboard computer in order to power electronics of the outboard computer, wherein the outboard computer further includes at least one current limiter; and
first and second wires connecting the resistor network of the at least one current limiter.
8. The system of claim 7 , wherein the resistor network includes a four-resistor resistor network.
9. The system of claim 7 , wherein the resistor network includes a two-resistor resistor network.
10. The system of claim 8 , wherein two resistors of the four-resistor network are connected to a differential receiver amplifier of the inboard computer.
11. The system of claim 7 , wherein one of the resistors of the resistor network is connected to an external power source.
12. The system of claim 7 , wherein one of the resistor of the resistor network is connected to ground.
13. The system of claim 7 , wherein the at least one current limiter includes a pair of parallel current limiters, each connected to the first or the second wire.
14. The system of claim 7 , wherein the outboard computer includes a load switch in-series with a load resistor.
15. The system of claim 7 , wherein the outboard computer includes a processor configured to control a switch to selectively connect a load across the voltage limiter.
16. The system of claim 7 , wherein the system is located within a fuselage of an aircraft.
17. The system of claim 7 , wherein the system is located within a flammable environment.