请问NI在网站上说的“NI总线接口软件产品增加了对USB的支持”？

新闻发布——2003年6月10日-National Instruments(美国国家仪器有限公司，简称NI
)今天发布其NI-Device Version 1.4 和 NI-VISA Version 3.0总线接口软件，该产品现
在可支持USB接口
NI-VISA
Universal I/O Interface Software
Simplifies system integration across different buses
Interfaces for LabVIEW, LabWindows/CVI, and Measurement Studio
Interactive control utilities for ease of development and debugging
For Windows 2000/NT/XP/Me/9x (contact NI for information on other OSs)
是说LV还是不支持USB，要单独买个软件吧。
报价还挺规的快500刀了。
为啥NI就不直接支持USB呢？奇怪
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简单，多赚500刀把
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Do not look at USB as an equivalent to the serial protocol.  It is more inl
ine with ISA and PCI buses.  There is not a specific protocol for USB commun
ications like there is for RS-232.  Because of this the manufacturer of the
USB device will need to supply a DLL (driver) for the specific device.  You
will interface with the USB device in LabVIEW by making specific function ca
lls to the DLL in a Call Library Function Node.  The format of the function
calls need to be supplied by the organization the created the DLL.
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