National Instruments 321645c-01 用户手册

Chapter 1

Using the NI-DAQ Functions

NI-DAQ FRM for PC Compatibles

1-2

©

 National Instruments Corporation

use the configuration utility to verify your device numbers. You can use 
multiple DAQ devices in one application; to do so, simply pass the 
appropriate device number to each function.

If you are using SCXI, you must pass the chassis ID that you assigned to 
your SCXI chassis in the configuration utility to the SCXI functions that 
you use. For many of the SCXI functions, you must also pass the module 
slot number of the module you want to use. The slots in the SCXI chassis 
are numbered from left to right, beginning with slot 1. The controller on the 
left side of the chassis is referred to as Slot 0. You can use the configuration 
utility to verify your chassis IDs and your module slot numbers.

The NI-DAQ API is identical in Windows 95 and Windows NT. Every 
function description has a parameter table that lists the data types in each 
of the environments. LabWindows/CVI uses the same types as Windows. 
The following sections describe the notation used in those parameter tables 
and throughout the manual for variable data types.

Table 1-2 shows the primary type names and their ranges.

Table 1-2.  Primary Type Names

u8

8-bit ASCII 
character

0 to 255

char

Not supported by 
BASIC. For functions 
that require character 
arrays, use string 
types instead. See the 
STR description.

Byte

i16

16-bit signed 
integer

–32,768 to 32,767

short

Integer

 

(for example: 

deviceNum%

)

SmallInt