DS3678 - RS232 for dummies

I am trying to send a simple messages to a DS3678-SR scanner, that I have connected into the com-port of my laptap.

I need the scanner to make an error beep, if the scanned data is not ok.

I have no problems receiving data, but how should the message look like to make an beep?

Is it not possible to send a single RS-232 message to make is beep?