ALFAT SPI DataReady signal

I am trying to use the DataReady signal from ALFAT firmware 2.0.0 to control the reading of data but the signal seems to deactivate too soon, i.e. while there is still one character in the buffer, for example the final \n in the banner. The attached images show this. I am only able to read all of the data by counting the expected number of characters. Am I misunderstanding something or is this a bug that could be fixed?

@ nrg -

It can be the last byte is still in shift register, while that pin does only check counter of bytes in the external buffer.
We will take a look.