与web浏览器类似，框架应用程序具有菜单栏、工具栏和
导航树。从视觉上看，框架应用程序围绕着设备供应商的
分分钟。就像从“收藏夹”导航树打开网页一样，用户可以
向下导航列出现场设备标记的树，单击其中一个，然后打开
框架内的设备供应商DTM。而且，就像让用户交互的网页
对于预订系统或购物服务，设备DTM允许用户
以多种方式与现场设备交互。设备DTM供应商
可以创建图形丰富的用户界面
Windows PC类型界面。技术的第三部分
通信DTM，提供标准化通信应用
PC内的过程接口（API），设备供应商之间的接口
DTM和处理传递的主机系统的特定驱动程序
从PC到现场总线接口卡的通信。
主机系统供应商为每个系统提供一个通信DTM（comDTM）
支持的现场总线协议。这确保了PC、网络的细节，
接口卡和主机系统的直通协议是透明的
到设备供应商的DTM。这与互联网类比相关，其中：
网页对其运行的PC、网络品牌是透明的
或者通信是DSL还是宽带电缆。
FDT技术补充并扩展了现有设备描述Similar to a web browser, the Frame Application has menu bars, toolbars, and a
navigation tree. Visually, the frame application surrounds the device vendor’s
DTM. Like opening a web page from a ‘favorites' navigation tree, a user can
navigate down a tree that lists the field device tags, click on one, and open the
device vendor’s DTM inside the frame. And, like web pages that let users interact
with a reservation system or a shopping service, the Device DTMs let the user
interact with the field device in a wide variety of ways. The Device DTM vendor
can create a graphically rich user interface that does virtually anything possible in
an advanced Windows PC-type interface. The third part of the technology, the
Communication DTM, provides a standardized communication Application
Process Interface (API) inside the PC, interfacing between the Device Vendor’s
DTM and the host system’s specific driver that handles pass-through
communications from the PC down to the fieldbus interface card.
The host system vendor supplies a Communication DTM (comDTM) for each
supported fieldbus protocol. This ensures that the details of the PC, network,
interface cards, and pass-through protocols of the host system, are transparent
to the device vendor’s DTM. This correlates back to the internet analogy where:
the web page is transparent to the PC it’s running in, the brand of the network
interface card in the PC, or whether communication is DSL or broadband cable.
FDT technology complements and expands existing device description
