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Description
I tried to establish Modbus RTU communication between Arduino Portenta Machine Control and a device, but without success.
I wanted to follow the example given here to the letter:
https://docs.arduino.cc/tutorials/portenta-machine-control/user-manual/#modbus-rtu
I discovered that this line of the tutorial's code:
MachineControl_RS485Comm.begin(baudrate, preDelay, postDelay);
had not been updated to reflect the change made by #27.
I added the missing the config argument:
MachineControl_RS485Comm.begin(baudrate, SERIAL_8N1, preDelay, postDelay);
I submitted a correction for the tutorial: arduino/docs-content#2779
I ran the tests in both half and full duplex without success. Even with the correction, the problem persists. This is the error:
- Writing coil values ... - Failed! Error code: Connection timed out
- Writing coil values ... - Failed! Error code: Connection timed out
- Writing coil values ... - Failed! Error code: Connection timed out
- Writing coil values ... - Failed! Error code: Connection timed out
I don't understand where the problem lies. We have purchased many Portenta Machine Controls for this purpose, so if it does not work, we need to figure out how to solve the problem.
This is my PlatformIO ini file:
[env:portenta_h7_m7] platform = ststm32@~19.4.0 board = portenta_h7_m7 framework = arduino build_flags = -Os -flto lib_deps = arduino-libraries/ArduinoBLE@^1.4.1 bblanchon/ArduinoJson@^7.4.2 arduino-libraries/ArduinoRS485@^1.1.1 arduino-libraries/Arduino_PortentaMachineControl@^1.0.4 arduino-libraries/ArduinoMqttClient@^0.1.8 mobizt/ESP_SSLClient@^2.2.3 arduino-libraries/ArduinoModbus@^1.0.9
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