Description

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.