EXFO FTB-2 Bedienungsanleitung Seite 319

Using Your Unit and Modules in an Automated Test Environment
You must pay special attention to queries that return an indefinite ASCII

response. To avoid any confusion, the IEEE 488.2 standard requires that
this data type be immediately followed by a response termination
character. For this reason, when working with compound queries, you
must ensure that a query sending an indefinite ASCII response is the
last query of the series.
Be careful when sending program messages containing multiple

queries that return large amounts of data. Since the controller can only
retrieve data when the instrument has finished processing the queries,
it could result in problems ranging from a saturation of the output
queue to the complete blocking of the whole system.
FTB-2/FTB-2 Pro and FTB-4 Pro
Writing Remote Control Code
303