esp-idf/examples/protocols/modbus_slave/main/Kconfig.projbuild

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menu "Modbus Slave Example Configuration"
config MB_UART_RXD
int "UART RXD pin number"
range 0 34
default 22
help
GPIO number for UART RX pin. See UART documentation for more information
about available pin numbers for UART.
config MB_UART_TXD
int "UART TXD pin number"
range 0 34
default 23
help
GPIO number for UART TX pin. See UART documentation for more information
about available pin numbers for UART.
config MB_UART_RTS
int "UART RTS pin number"
range 0 34
default 18
help
GPIO number for UART RTS pin. This pin is connected to
~RE/DE pin of RS485 transceiver to switch direction.
endmenu