As I am working on the stm32G474VETx with LQFP100 packing. For master and slave, I am using same type of board. I am implementing the MODBUS communication using the fiber optic cable but every time I am getting the error code 06 showing that the salve is busy. I am requesting the everyone what is the possible reasons getting the slave in busy state. And mention the how to fix them. I need to operate this in at least in the 1 Mbps to 2. I implementing the MODBUS using the UART Communication. Mention some of the example code implementing MODBUS in stm32 using the polling method, interrupt method and DMA method.
