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stm32f103 modbus rtu-485 with Delta hmi

Question asked by Mahmoud Al Abrash on Apr 2, 2018

Hello, My name is Mahmoud form Turkey,
I'm trying to connect Delta Hmi with modbus protocol using RS485 connection method. I use STM32F103C8 microcontroller. I'm trying to apply to finish my internship project, I know that I cant directly connect MCU with HMI using modbus so I get MAX485 chip.

I have found some library but I can't figure it out.

GitHub - urands/stModbus: Modbus RTU for Cortex-M (STM32 series: STM32F103, STM32F3xx) 

GitHub - aguegu/stm32-modbus at quattro 

GitHub - AndruPol/chibi-modbus-master: ChibiOS/RT (STM32) Modbus RTU master example project (FreeModbus 1.6 master/slave… 

any body can help please?
I still fresh on stm32 topics