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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 :

http://homepage.eircom.net/~nigelbrooke/Electronics_Projects/RS485_adapter_raspberry_pi.html

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)?

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  • 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?
    – Dmitry Grigoryev
    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

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