Rockwell Automation 2755-SNx Adaptascan Bar Code Readers - Manual (Page 270)

13–16 Communicating with a 2760-RB Module over an RS-232 Link
Publication 2755-6.8
10. Under Replacement Strings, type no read in the Fail: field.
Bar code data is sent to the controller on a valid read. The Fail
string sends the characters “no read” when a no read occurs.
11. Click OK to return to the Message Field dialog.
12. Click OK to return to the Message dialog.
13. Click Save and then Close to return to the main Project dialog.
From the main Project dialog, click the Send Device button to
download the configuration to the bar code reader.
Use the Monitor dialog to verify the decoding of bar code labels.
Sending the Configuration
to the Reader