Exfo FTB-2 User Manual download pdf (Page 257)

100

101

Using Your Unit and Modules in an Automated Test Environment

FTB-2 and FTB-2 Pro 247

Writing Remote Control Code

When you write code, you must follow these rules on message reception

and transmission:

 The controller must have sent a complete message to the instrument

(including the message terminator) before retrieving a response.

 The controller must retrieve all the responses from previous queries

(including the response terminator) before sending a new message to

an instrument.

 The controller must not try to retrieve a response from an instrument if

the corresponding query has not been previously sent to the

instrument.

 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.

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Exfo FTB-2 User Manual Page 257

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