Fluke ScopeMeter 190 Series, Programming Reference Manual

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Page 2.4
** Acknowledge **
After receiving of a command, the ScopeMeter
automatically returns the <acknowledge> response to let the
computer know whether or not the received command has been
successfully executed.
This response is a one-digit number followed by <cr> as
response terminator. If <acknowledge> is 0, it indicates
that the ScopeMeter has successfully executed the
command. If the command was a query, the <acknowledge><cr>
response is immediately followed by the queried response data
terminated with <cr>.
If <acknowledge> is 1 or higher, it indicates that the
ScopeMeter has not executed the command
successfully. In that case, if the command was a query, the
<acknowledge><cr> response is NOT followed by any further
response data.
There can be several reasons for a non-zero <acknowledge>
response. For more information see Appendix A.
In case of an error you can obtain more detailed status
information by using the ST (STATUS) query.
Note: YOU MUST ALWAYS INPUT <acknowledge>, EVEN WHEN
THE COMMAND WAS NOT A QUERY.