OK. I breezed through the manual and it only supports a pretty limited configuration, and no programming.
When you’re in inventory mode, you scan a number of normal barcodes and then the special terminator barcode from the manual to tell the scanner to transmit the accumulated barcodes. How about this: create another barcode that gets scanned just before the special terminator barcode. It will read something that you will never scan in the real world, like ‘ENDENDEND’, that your program can watch for when the data arrives and take appropriate action.