The sample code provides three element uint16_t array used for the modbus slave registers. These values are printed each second through UART1. mbPrint() is triggered on valid write multiple registers (0x10) command.
Several environment variables (envvar:RS485_RE_PIN :envvar:`RS485_TX_LEVEL`) can be used for configuration. The slave address is defined with envvar:MB_SLAVE_ADDR. For example:
make MB_SLAVE_ADDR=2These variables can be listed with:
make list-config