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RS485 to UART Convertor using PMODRS485


Subrat

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Hi @Subrat,

The setup you attached will not work if you are expecting to operate in full-duplex mode. The reason for this is due to how the Receive Enable and Driver Enable pins on the embedded ADM2582E work. Your setup may work for half duplex RS485, at least based on Figure 41 of the ADM2852E datasheet (link).

As noted in the Pmod RS485 Reference Manual (link), the Driver Enable must be pulled to a logic high state in order to transmit data, whereas the Receive Enable must be driven to a logic low state in order to receive data. Because your setup ties both RE and DE together to the same pin on the host system, you would only be able to do either sending or receiving, not both simultaneously.

I'm also presuming that your diagram would configure the host TX pin as an output rather than as an input as indicated by the arrow on your diagram.

Thanks,
JColvin

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