Modbusino RTU generic sample

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 RS485_TX_LEVEL) can be used for configuration. The slave address is defined with envvar:MB_SLAVE_ADDR. For example:

make MB_SLAVE_ADDR=2

These variables can be listed with:

make list-config

References

• Source Code

• Sming (main)

• modbusino RTU Library (modbus slave)

Environment Variables

• MB_SLAVE_ADDR

SoC support

• esp32

• esp32c2

• esp32c3

• esp32s2

• esp32s3

• esp8266

• host

• rp2040