National Instruments Welding System 321645c-01 Manual De Usuario

Chapter 2

Function Reference — AI_Read

National Instruments Corporation

2-13

NI-DAQ FRM for PC Compatibles

Note

NI-DAQ does not distinguish between the low-gain and high-gain versions of the
AT-MIO-16.

you enter a gain of 10 and you have a device with gains of 1, 2, 4,

and 8, a gain of 2 actually is used and no error is returned.

reading is the integer in which NI-DAQ returns the 12-bit or 16-bit result of the A/D
conversion.

Range:

0 to 4,095 (12-bit devices, unipolar mode).
–2,048 to 2,047 (12-bit devices, bipolar mode).
0 to 65,535 (16-bit devices, unipolar mode).
–32,768 to 32,767 (16-bit devices, bipolar mode).

Note

C Programmers—reading is a pass-by-reference parameter.

Using This Function

AI_Read

addresses the specified analog input channel, changes the input gain to the specified

gain setting, and initiates an A/D conversion.

AI_Read

waits for the conversion to complete

and returns the result. If the conversion does not complete within a reasonable time, the call
to

AI_Read

is said to have timed out and the timeOutError code is returned.