That looks like his solution Dave.
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That looks like his solution Dave.
That looks like his solution Dave.
They have CTS and RTS lines that work pretty much...
They have CTS and RTS lines that work pretty much just that way.
Do you have a spare MCU pin on the reader's pics?...
Do you have a spare MCU pin on the reader's pics? If so you could hook the readers all to the usart with a series resistor on each, then when a reader sends data it could pull that spare pin low...