SLLA595C march   2023  – june 2023 THVD1424 , THVD1454

 

  1.   Abstract
  2.   2
  3.   Trademarks
  4. 1Typical RS-485 Networks and the Need for Termination
  5. 2Network Length, Data Rate, and Stubs
  6. 3Discrete Design for Switchable Termination and Duplex Switching
  7. 4Discrete Design for Duplex Switching
  8. 5 THVD1424 and THVD1454 Flexible RS-485
  9. 6Application Diagrams with THVD1424
  10. 7Experimental Results from Four Node Testing of THVD1424
  11. 8Conclusion
  12. 9Revision History

4 Discrete Design for Duplex Switching

Alternate discrete implementation for a design that can act as pin-controlled half duplex or full duplex is to use two half-duplex transceivers and build logic around as shown below to transmit and receive data for two-wire or four-wire networks.

GUID-20221011-SS0I-1QSZ-3CLG-MF9KSNTBPTQH-low.svg Figure 4-1 Logic Implementation of Duplex Switching

Same issue with this design that this occupies considerable board area because of two RS-485 transceivers and logic gates.