怎么从PNA-x N5245A读取二进制数据

早上好，我是这个论坛的新手，希望这是提出这个问题的合适场所。
我正在尝试使用labview 2011 over Ethernet从N5245A PNA-X获取数据。
我找到了这个论坛并下载了一个名为PNA Binary Data Read的程序（2011年10月31日发布），并且能够让它运行起来。
做了我正在寻找的，很棒的小程序。
但是当我第二次尝试运行它时，所有我回来的数据都是零。
它使用viScanf格式化分析仪的数据。
为了让它再次运行，我需要关闭Labview并重新启动它，然后程序才能再次收集和显示数据。
我是使用VISA的新手，无法弄清楚为什么这只能使用一次。
在每次重新运行程序之前，是否需要重置某些内容？
谢谢你



     以下为原文

  Good morning

I am new to this forum and hope this is the right place to ask this question.

I am trying to obtain data from a N5245A PNA-X using Labview 2011 over Ethernet.

I found this forum and downloaded a program called PNA Binary Data Read (posted Oct 31, 2011)  and  
was able to get it running.  Did just what I was looking for, great little program.  But when I try running it the second time
all I get back for data is zero's.  It uses the viScanf to format the data from the analyzer.   

In order to get this to work again, I need to close out Labview and restart it before the program is able to collect and display the data again.  
I am new to using VISA and can't figure out why this only works one time.

Do I need to reset something before I rerun the program each time?

Thanks  

mark