Description

This design demonstrates the implementation of a buspowered RS-485 application and allows to evaluate different filters for the DC power. This saves the cost and space for a separate power wiring.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.