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Interface on light control system

Hak-Jin Jeong
Intellectual 350 points


Hello

I am now considering light control system.

In the system, I have to send data and power from master controller to other slaves like lighting switch, relay controller by using only two wires between each other.

for example, +/-24V power supply, control data( relatively small data traffic with low speed will be required)

Distance might be up to 1km total(repeater can be used if possible)

Bus topology cab be  multi-drop,star or others( depends on installation site)

I checked what the interfaces are being used in similar product lines,

but I couldn't find solution.

Some lighting companies might have their own specific interface(hidden)

I prefer to use some kinds of more widely-used interface technology(proven)

Can you recommend the suitable interface for my application?

Best Regards

Hak-Jin Jeong

  • 0
    TI__Expert 5400 points

    Hak-Jin,

    Independent of the power consideration, RS-485 would be a suitable interface standard for the topology you describe (1km, multidrop or multipoint).  Generally a daisy chain topology is recommended, but stars and other topologies may work if the data rate is low enough.

    Transmitting power over such a distance however, may prove more problematic.  In principle, a configuration such as discussed here could be useful, but at 24V, any meaningful load power would result in a significant voltage drop.  Likely you will have to step up the voltage considerably and transmit power and data separately.