Hi all,
Does anyone know of a low part count and cheap solution for bidirectional (half-duplex) communications on the 48VDC supply line? Baud rate of 19200bps would be nice.
I did a quick test with an LM567 @300kHz, but it is slow and unreliable. Also, it requires a very high SNR of -6dB.
Device is powered on a pair of wires, without being locally grounded, and can be connected in parallel with others, with differing cables lengths. All devices must be able to communicate with a master device, which is presumably using the same comms hardware as the satellite devices. Cables could be 100m long, and could have a fair bit of noise on them. They can also have up to 4A of current flowing through them, which feeds into an SMPS, so large valued decoupling inductors would not be suitable. Cable is similar to 2-core mains power cable.
Any ideas of simple to use devices?
Does anyone know of a low part count and cheap solution for bidirectional (half-duplex) communications on the 48VDC supply line? Baud rate of 19200bps would be nice.
I did a quick test with an LM567 @300kHz, but it is slow and unreliable. Also, it requires a very high SNR of -6dB.
Device is powered on a pair of wires, without being locally grounded, and can be connected in parallel with others, with differing cables lengths. All devices must be able to communicate with a master device, which is presumably using the same comms hardware as the satellite devices. Cables could be 100m long, and could have a fair bit of noise on them. They can also have up to 4A of current flowing through them, which feeds into an SMPS, so large valued decoupling inductors would not be suitable. Cable is similar to 2-core mains power cable.
Any ideas of simple to use devices?