The power line modem reference design is based on the MC68HC908GR8 8-bit microcontroller unit (MCU). This MCU controls a half duplex synchronous FSK modem device. The reference design consists of:
- Hardware design of the PCBs
- Software development of the physical and data-link layers according to the Konnex PL132 specification
- A demo application communicating bi-directionally
At the heart of the reference design is Freescale's MC68HC908GR8 MCU where the central part of the physical layer and the data link layer are implemented. The FSK modem device chip, with external coupling circuits, serves as part of the physical layer of the ISO-OSI reference model. An interface to the higher layers is implemented through API functions. Because this reference design is intended as a demonstration, a basic proprietary implementation of an application layer, dedicated to a particular end-device, is also made.
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Features
Target Devices/Platforms:
- Communication and physical interfaces
- Home Automation
- Konnex PL132 implementation
- MC68HC908GR8
- M68HC08 Family
Application Features:
- The power line modem which controls a half duplex synchronous FSK modem device
- Konnex PL132 physical and data link layers specification demo implementation
- Intelligent domestic light demo application
- Two kinds of devices used, master and slave PLM boards
- The master PLM board has the KNX132 communication functions, an isolated power supply and a user interface with four buttons, four LEDs and one knob.
- The slave PLM board has the KNX132 communication functions, a non-isolated power supply and a running "Intelligent domestic light" demo application, which shows control features of the connected lamp as an end-device.
Application Usage:
Hardware:
A bill of materials and schematic diagrams are provided within the design reference manual, DRM009, to allow easy self-assembly of the boards.
Reference Design:
The Konnex PL132 Power Line Modem Reference Design was created in the MCSL Czech Systems lab, in Roznov.