EXFO FTB-500 (Window XP) - Инструкция (Страница 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).