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ADS1293EVM: ADS1293EVM doesn't work SDO pin

Part Number: ADS1293EVM
Other Parts Discussed in Thread: ADS1293


I want connection ADS1293EVM(Slave) and Nucleo board(Master) to SPI.

static void MX_SPI2_Init(void)
    hspi2.Instance = SPI2;
    hspi2.Init.Mode = SPI_MODE_MASTER;
    hspi2.Init.Direction = SPI_DIRECTION_2LINES;
    hspi2.Init.DataSize = SPI_DATASIZE_8BIT;
    hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;
    hspi2.Init.CLKPhase = SPI_PHASE_2EDGE;
    hspi2.Init.NSS = SPI_NSS_SOFT;
    hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_128;
    hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;
    hspi2.Init.TIMode = SPI_TIMODE_DISABLE;
    hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
    hspi2.Init.CRCPolynomial = 7;
    hspi2.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
    hspi2.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
    if (HAL_SPI_Init(&hspi2) != HAL_OK)

uint8_t ads1293ReadRegister(uint8_t rdAddress) //0x40
    uint8_t send_data = rdAddress;
    uint8_t m_tx_buf; 
    HAL_SPI_Transmit(&hspi2, &send_data, sizeof(send_data), 1000);
    HAL_SPI_Receive(&hspi2, &m_tx_buf, sizeof(m_tx_buf), 1000);
    return (m_tx_buf);

I sent a address (0x40), So, i thought i would receive 0x01.

1. SCL and CS

2. SCL and SDI

3. SCL and SDO

Please, Tell me why the SDO pin isn't working.

What am i check more?

(I'm sure I connected GND pin each other, and I think all pins connecting exactly)