RTOS/LAUNCHXL-CC2640R2: Understanding the UART_read() command

Part Number:LAUNCHXL-CC2640R2

Tool/software:TI-RTOS

Hi,

I'm in some trouble with receiving over UART. In my scenario, i want to send a command (as a master) and then read the answer from a LIN-Bus slave node.

Everything works fine, until reading back the answer from the LIN slave node.

But if i use two Launchpads sending with the first one only the request and if i read back the answer with a second one everything works fine.

    UART_Params_init(&uartParams);
    uartParams.writeDataMode = UART_DATA_BINARY;
    uartParams.readDataMode = UART_DATA_BINARY;
    uartParams.readTimeout = 20 * 1000 / Clock_tickPeriod;
    uartParams.readEcho = UART_ECHO_OFF;
    uartParams.baudRate = 19200;

        LINHeader[1] = calcPID(0x22);
        sendBreak();
        UART_write(uart, &LINHeader, 2); //sending request
        UART_read(uart, &FrameBuffer, 8); //reading answer

How do i have to configure the UART interface to swtich to reading after sending the Header? I think i have to use UART_readPolling(), but this command is not supported according to the driver documentation.

regards

Maximilian