Specifies the test data to be returned. Specify a character string of up to 247 characters, or the maximum message length of the terminal, whichever is smaller. If you do not specify a character string, VTAM® sends out and returns a string consisting of the letters A–Z followed by the decimal numbers 0–9. ("ABCDEF…XYZ01…789")
You can include blanks as part of this message if the string is surrounded by single quotes.