Sorry for not elaborating but from memory cat5 you have differential RX and differential TX and don't they use two other wires for DC supply?
Anyway I only want to use two wires Power Line Communication by imposing a carrier on a DC powerline.
CAT5 has 8 wires and 4 of them in most conditions...
Many Thanks again,
POE is a 6 wire with 48Vdc and due to cat5 is only really expected to power 'ultra lower power' devices due to cable lengths and all that (Thats from memory but its roughly right).
The nearest spec that is near to what I want is DC Lin or DC Can it an automotive spec for...
Thanks for the replies,
I haven't come across HART protocol which surprises me as I have done a fair bit of process control.
The 24Vdc supply is a power line providing up to 100watt for device drivers.
X10 doesn't really hit the mark as being AC transmitting at the zero level crossing in slow...
I am having this mad idea of coupling a carrier frequency on top of a 24Vdc power line. The idea is that a band pass filter will detect pulses of the ASK carrier and provide a PWM signal for application control but obviously only requiring 2 cables.
I know protocols such as DC Lin and DC Can are...
