I'm looking for some help with a PCB design i'm doing, i want to connect a power analyzer thar requites Modbus protochol, using 485 halfduplex For that to work i need to enable a disable the rs485 tranductor via gpio or timer555. i copy pasted this :


I copied the configuration above to se my raspberry as master.

-The would be any problems with the modbus timeout? (i set it like the example at 40us)

-is it a safer solution to set the enable using gpio/mcp23017(i2c)?

  • What is copy pasted? Assuming that means building the same schematic, there are several config options described in that post, which one did you use? Mar 17, 2017 at 12:51
  • Hi thanks for answer, i used the mode where the timer control the enable of the rs485, i used that same r and c in the timer in order to achieve the same timeout .
    – Carlos Hxc
    Mar 20, 2017 at 15:27


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Browse other questions tagged or ask your own question.