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Regarding 2 wire RS485 to microcontroller RX pin.

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kiranhatti

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Dear All,


I have designed circuit to convert 2 wire RS485 to TTL (to microcontroller RX pin).

Note: I am going to implement only Reception. So there is only one Max485 ic.

Can you please let me know whether the microcontrller will receive the data?

Please find the attachment.
 

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  • RDU_RS485.pdf
    43.2 KB · Views: 13
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FvM

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The circuit is basically correct. Naming of the RS485 lines may be different, you have to check if "Rx+" and "Rx-" is connected correctly. "Rx+" should be more positive in idle state.
 

kiranhatti

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Thank u for your kind response.

Rx+ should be more positive in idle state means Rx+ should be pull down to ground right?
 

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