ISO RS485 on M5dial

robski

@mukul_100_ what software you planning to use?
see uiflow2 init example

mukul_100_

i am using platformio right now. thanks

felmue

Hello @mukul_100_

please find an example here with M5Dial and RS485 unit controlling an ACSSR relay via Modbus protocol.

Thanks
Felix

mukul_100_

@felmue hi felix sorry for the late reply, finally got a chance to get back to this

i studied the example but not sure if i understood how to implement the master slave concept through this and also there is a error thrown in
RS485Class RS485(Serial2, GPIO_NUM_1, GPIO_NUM_2, -1, -1);

as there are only 4 arguments accepted by the class
also serial2 needs some tweaking for esp32 right?
thanks

felmue

Hello @mukul_100_

I linked the incorrect variants for RS485 and Modbus libraries. Sorry about that. I fixed the example. The libraries I used are the ones from M5Stack.

https://github.com/m5stack/ArduinoModbus
https://github.com/m5stack/ArduinoRS485

Thanks
Felix

mukul_100_

@felmue Hi felix
the changes you mentioned are in the same example code that is linked above?

felmue

Hello @mukul_100_

yes.

Thanks
Felix

mukul_100_

@felmue ,did you make any changes in the RS485.h file
along these line 46
#else
#ifndef RS485_DEFAULT_DE_PIN
#define RS485_DEFAULT_DE_PIN A6
#define RS485_DEFAULT_RE_PIN A5
#endif

thanks,
Mukul

felmue

Hello @mukul_100_

No.

I think you are still on the library I incorrectly linked to in my example before.

Incorrect library: https://github.com/arduino-libraries/ArduinoRS485

Library I used: https://github.com/m5stack/ArduinoRS485

Thanks
Felix

mukul_100_

@felmue Hi, felix i got it working finally. The issue is, on platformIO the library Arduinomodbus library and ArduinoRS485 library are the arduino ones and not the m5stack ones which is why i was getting error.
A fix to this was to just replace the internal files of library to the m5stack ones from github.
Thank you for the help.