esp-idf/examples/protocols/modbus/serial/mb_master/main/Kconfig.projbuild

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menu "Modbus Example Configuration"
config MB_UART_PORT_NUM
int "UART port number"
range 0 2
default 2
help
UART communication port number for Modbus example.
config MB_UART_BAUD_RATE
int "UART communication speed"
range 1200 115200
default 115200
help
UART communication speed for Modbus example.
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.
choice MB_COMM_MODE
prompt "Modbus communication mode"
default MB_COMM_MODE_RTU if CONFIG_FMB_COMM_MODE_RTU_EN
help
Selection of Modbus communication mode option for Modbus.
config MB_COMM_MODE_RTU
bool "RTU mode"
depends on FMB_COMM_MODE_RTU_EN
config MB_COMM_MODE_ASCII
bool "ASCII mode"
depends on FMB_COMM_MODE_ASCII_EN
endchoice
endmenu