SerialController Question

I am using an example project in xojo bundle, in communication folder, Serial port Barcode reader.
I am using the default project code and i am using it to read the output from an old weighing scale device with serial interface.

The output that I have is numeric, mixed with non-numeric value, I remove it all by using regex function and its works.

my problem is,
when i do reading the output from the device, its running and works perfectly. but,
sometimes the output is not showing.

is there any setting that need to be applied ?
I follow the default property, like baud=9600, bits, Parity and stop.