This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
SN65HVD96: RS-485 Power Over Bus
Part Number: SN65HVD96
I am developing a solution for Powerline communication. Study different Circuits, I stuck when I send a signal from USB to rs485 Converter to my module it is not read any data on the slave side . when I check with MSO I find out that signal Transmitted, but the Differential signal was less them 200 millivolts. Then I study that I need an AC / DC square wave signal for communication when I send it through DC line the RS485 chip not read this differential signal.
So according to my investigation, I find either I have to generate a square wave power supply for communication over DC power.
Reference Design from :
**Using SN65HVD96 to Create a Power-Over-Data and Polarity Immunity Solution
To transmit data over power line, you could separate data and DC power in different frequency domains by using inductors and capacitors. Therefore data and power don't interfere with each other although they share the same bus physically. The data need to be modulated (like Manchester code) or use tri-level signaling (like this reference design). The purpose is having a pure 'AC' signaling with a balanced DC bias. Please let me know if you have more questions about this interesting topic.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
In reply to Hao L:
thanks for your support . As you have guided me to study the Manchester Code and Tri-Level Signal I go through one video and also study a few notes from Google. Now i try to implement in controller coding and then show u my Scope output and I hope the concept which you have given to me help me in development.
Suggest me I have to couple this Tri-level signal at input or Output of SN65HVD96. As output is coupled to DC line and I think that result in Attenuation of Signal.
In reply to Sukhpal Singh:
The tri-level signal are connected to the A/B pins of HVD96. You can refer to this app note for the details. http://www.ti.com/lit/an/slla336/slla336.pdf
For RS485 signaling, you can refer to this design: http://www.ti.com/lit/ug/tidu993/tidu993.pdf
Please let me know if you have more questions.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.