National Instruments 370551A-01 用户手册

The easiest way to learn how to communicate with your instruments is by 
controlling them interactively. Use the VXI/VME interactive control utility 
(

vic

 or its text mode counterpart, 

victext

) to write to and read from your 

instruments. This utility displays the status of your VXI/VME transactions 
and informs you of any errors that occur.

Refer to the online help for instructions on how to use 

victext

 and to learn 

about the features of each.

The 

NIVXI/examples

 subdirectory contains various example programs 

along with a makefile that show how to use various functions in the NI-VXI 
software and how to develop application programs using these functions. 
Make certain that the environment variable 

NIVXIPATH

 is set correctly as 

described in Chapter 5, 

. Also refer 

to your software utilities reference manual for additional examples.

For NI-VISA programming examples, look in 

VXIpnp/linux/

NIvisa/Examples

.

The following sections contain information for you to consider when 
developing Linux applications that use the NI-VXI/VISA bus interface 
software.

Multiple-application support is another feature in the NI-VXI/NI-VISA 
libraries. You can have several applications that use the NI-VXI and/or 
NI-VISA libraries running simultaneously. In addition, you can have 
multiple instances of the same application running simultaneously. 
The NI-VXI/NI-VISA functions perform in the same manner whether you 
have only one application or several applications (or several instances of 
a single application) all using the NI-VXI/VISA libraries.

However, you do need to be careful in certain cases as described in the 

 section.