B4J Question jSerial_Astreams ... read Value

Hello, I'm using the Serial library to write and read data from USB / Serial.
I have the need to read the data (input buffer) only in certain procedures of the program and not through "Astreams_NewData Event".

Example :

Astream.write ("Hello")
InData = (buffer value in serial)
Astream.write ("Date Recive")


It can be done ? as ?

Thanks Marco.