The return data buffer is used for communicating between the card and the host. Functions that read data from card such as flex_read_pos and flex_check_move_complete_status put data into the buffer. This error occurs when data is remaining in the buffer that was not flushed correctly by the function or when multiple resources are trying to access the card. To prevent this error, you can check for any errors from from previous fucntions and call flex_flush_rdb if necessary. This error can also occur if you are doing onboard programming with MAX open.
Regards,
Brent R.
Applications Engineer
National Instruments
