This property affects the operation of the Input method. When your application collects/retrieves data from the receive buffer (See the Input method) it will return a maximum of this many bytes for each .Input operation.
The default for this property is 0 (zero). If this property is set to 0 then the Input method will retrieve ALL bytes from the receive buffer.
Leave this at default zero unless you really need to receive fixed length packets or single characters/bytes.