National Instruments 321645c-01 用户手册

Chapter 2

Function Reference — AO_VWrite

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 National Instruments Corporation

2-45

NI-DAQ FRM for PC Compatibles

Accepts a floating-point voltage value, scales it to the proper binary number, and writes that 
number to an analog output or current channel to change the output voltage. 

 

chan is the analog output channel number.

Range:

0 or 1 for the AO-2DC, Lab and 1200 Series analog output, and MIO devices.
0 through 5 for AT-AO-6.
0 through 9 for AT-AO-10.
0 through 49 for the VXI-AO-48XDC.

voltage is the floating-point value to be scaled and written to the analog output channel. The 
range of voltages depends on the type of device, on the jumpered output polarity, and on 
whether you apply an external voltage reference.

•

Default ranges (bipolar, internal voltage reference):
MIO device:

–10 to +10 V

AT-AO-6/10:

–10 to +10 V

Lab and 1200 Series 

analog output devices:

–5 to +5 V

VXI-AO-48XDC:

–10.24 to +10.24 V

•

Default ranges (unipolar, internal voltage reference):
AO-2DC device:

0 to +10 V

i16

assigned by configuration utility

i16

analog output channel number

f64

floating-point value to be scaled and written