This reference design establishes a simulation model for implementing RS-485 communication over power cabling. This simulation model can be used to assess the feasibility of implementing RS485 communication at a given data rate, cable length, and loading for a specific cable before taking the time-consuming step of building a representative network. A procedure is given for developing a cable model for any given cable and replacing the cable model in the simulation.
A new preferred approach by using On-off key modulation to transmit RS-485 signals over power line is achieved with THVD8000. By integrating modulation and demodulation circuits, the THVD8000 can increase the frequency content of the baseband data being transmitted. This enables easier DC and AC coupling and system-side interfaces to standard universal asynchronous receivers-transmitters (typically used for RS-485) without any need for special encoding, which is useful in low-data-rate applications. This upgraded approach works well for both DC and AC power without any need for special coding in a microcontroller.
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
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Reference design overview and verified performance test data
Complete listing of design components, reference designators, and manufacturers/part numbers
Detailed schematic diagram for design layout and components
Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Design guide | Power Line Communication Using RS-485 Simulation Reference Design | Nov 16, 2018 |
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