National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — Timeout_Config

NI-DAQ FRM for PC Compatibles

2-400

©

 National Instruments Corporation

Establishes a timeout limit that is used by the synchronous functions to ensure that these 
functions eventually return control to your application. Examples of synchronous functions 
are 

DAQ_Op

, 

DAQ_DB_Transfer

 and 

WFM_from_Disk

.

timeout is the number of timer ticks. The duration of a tick is 55 ms (0.055 s), and there are 
approximately 18 ticks/s.

–1:

Wait indefinitely (timeout disabled).

0 to 2

31

:

Wait timeout * 0.055 s before returning.

The synchronous functions do not return control to your application until they have 
accomplished their task. If you have indicated a large amount of data and/or a slow acquisition 
or generation rate, you might want to terminate the function prematurely, short of restarting 
your computer. By calling 

Timeout_Config

 before calling the synchronous function, 

you can set an upper bound on the amount of time the synchronous function takes before 
returning. If the synchronous function returns the error code timeOutError, you know that 
the number of ticks indicated in the timeout parameter have elapsed and the synchronous 
function has returned because of the timeout.

The following is a list of the synchronous functions:

DIG_DB_Transfer

DAQ_DB_Transfer

Lab_ISCAN_Op

WFM_DB_Transfer

DAQ_Op

i16

assigned by configuration utility

i32

number of timer ticks