Exfo FTB-500 (Window XP) Manuale Utente Scaricare il pdf (Pagina 305)

Свойства и события COM

FTB-500 293

Свойства

Read

Description With this method you can retrieve all the data

from the device output queue in a UNICODE

format.

Syntax object.Read

Parameter(s) None.

Response(s) A string value (in UNICODE format).

Notes This method must be used in conjunction with the

Write method. Always ensure that a query has

been previously sent before attempting to read a

response from the output queue.

To properly set the data format, send the following

command (using the Write method):

FORM:DATA<wsp>ASCII <number_of_digits>

where <number_of_digits> corresponds to the

number of digits after the decimal point that you

require.

Remember that the retrieved data will have to be

converted to a numeric format before you can use

it in calculations, for example.

Possible error(s) Timeout: This error will occur if the allowed delay

has expired before the preceding Write operation

could send a response to the output queue. For

information on timeout setting, see Initialize на

стр.295.

QueryUnterminated: This error will occur if the

output queue is empty (e.g. no query has been

made previously).

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Exfo FTB-500 (Window XP) Manuale Utente Pagina 305