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You can not connect multiple serial devices to an interface (although it may be possible with additional circuitry to multiplex devices - only one can work at a time).
You can of course SEND to multiple devices but only receive from one.
You can not connect multiple serial devices to an interface (although it may be possible with additional circuitry to multiplex devices).
You can not connect multiple serial devices to an interface (although it may be possible with additional circuitry to multiplex devices - only one can work at a time).
You can of course SEND to multiple devices but only receive from one.