UART2 Modbus issues in STM32G070RBT6

[MathewANTHONY]

Hi, 

I was working with  Modbus Protocol with the external device(Aster TDS Meter).

The Modbus External device Settings in 9600baud rate, 8bit,parity none and 1stop bit 

My Problem was when i connect the device with UART4 i am able to get the output properly but i need to use UART2 but while using UART2 not able to receive the data properly what i am missing?

UART4 Configuration

static void MX_USART4_UART_Init(void)
{

/* USER CODE BEGIN USART4_Init 0 */

/* USER CODE END USART4_Init 0 */

/* USER CODE BEGIN USART4_Init 1 */

/* USER CODE END USART4_Init 1 */
huart4.Instance = USART4;
huart4.Init.BaudRate = 9600;
huart4.Init.WordLength = UART_WORDLENGTH_8B;
huart4.Init.StopBits = UART_STOPBITS_1;
huart4.Init.Parity = UART_PARITY_NONE;
huart4.Init.Mode = UART_MODE_TX_RX;
huart4.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart4.Init.OverSampling = UART_OVERSAMPLING_16;
huart4.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart4.Init.ClockPrescaler = UART_PRESCALER_DIV1;
huart4.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart4) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART4_Init 2 */

/* USER CODE END USART4_Init 2 */

}



UART 4 Connected with External  device(Aster) with RS485 Module Working Fine....!





UART 2 Configuration:

static void MX_USART2_UART_Init(void)
{

/* USER CODE BEGIN USART2_Init 0 */

/* USER CODE END USART2_Init 0 */

/* USER CODE BEGIN USART2_Init 1 */

/* USER CODE END USART2_Init 1 */
huart2.Instance = USART2;
huart2.Init.BaudRate = 9600;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart2.Init.ClockPrescaler = UART_PRESCALER_DIV1;
huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart2) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetTxFifoThreshold(&huart2, UART_TXFIFO_THRESHOLD_8_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetRxFifoThreshold(&huart2, UART_RXFIFO_THRESHOLD_8_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_DisableFifoMode(&huart2) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART2_Init 2 */

/* USER CODE END USART2_Init 2 */

}

But In UART 2 Connected with External Device(Aster)Via RS485 module  not working or not able to receive the data

So what makes the difference between UART2 and UART4

Expect the Configuration all other TX buffers RX buffers are same tested in  both UART4 working fine but UART 2 not working!

Please explain where i am doing wrong!

Advance Thanks!

A.Mathew