ESP32 MODBUS ASCII

[pedrazzi]

Hi, I am trying to make an ascii MODBUS with ESP32 wroom 32, but the compiler returns this error:
../main/esp-project.c: In function 'FCD_04c01_ModbusSlave1__SendAndCalcCRC16':
../main/esp-project.c9: error: 'FCR_RETVAL' may be used uninitialized in this function [-Werror = maybe-uninitialized]
Use: Reads the state of a single digital input.
Thanks in advance

[BenR]

Hello,

Many thanks for letting us know. I have now pushed out an update to the update system that should solve the problem for you.

[pedrazzi]

perfect! Thanks for the help..
I tested the serial (OK) then I put the ascii modbus program back, but this doesn't work ..

[LeighM]

If you need 19200 baud, could you try setting this in the UART properties and remove the ChangeBaud(4)
Could you try that please?

[pedrazzi]

the request is 9600 N 8 1, I put the setting at the beginning to be sure ..

[pedrazzi]

I tried to remove the setting, but the result is always the same. the strange thing is that it doesn't even respond error ...
(this is the message: :010200010010ED.. 3a 30 31 30 32 30 30 30 31 30 30 31 30 45 44 0d 0a )

[LeighM]

Could you check "Library Updates" "Full database"

[pedrazzi]

actually it was not fully updated, I did the full update and restarted, but the problem is not solved

[pedrazzi]

Hello, I also tried with another microprocessor (32U4 / Arduino Leonardo), but the result is the same, I'm afraid I'm making something trivial wrong ..

Thanks in advance

[LeighM]

Can you explain a bit more about your setup, what you have connected and what you are trying to do?
The Flowcode Modbus Slave component is to be used for creating Modbus Slave devices.
If you are creating hardware to connect to an existing Modbus (slave) device, then you need to use the Flowcode Modbus Master component.

There are examples on the Flowcode Wiki, such as this one
https://www.flowcode.co.uk/wiki/index.p ... s:_System)