6.4.2 XTPro Overview
XTPro is an acronym for XML TCP/IP Protocol. The XTPro specification is an application-layer
(positioned at level 7 of the OSI model) messaging protocol that provides XML-based client/server
communication via TCP port 843. Typically, XTPro is used for the implementation of graphical user
interfaces (GUIs), such as advanced web servers or HMIs that have the ability to request information via
XML sockets, and then manipulate and/or display the information in a rich application-specific manner.
XTPro is a request/response protocol that provides services specified by commands. For more
information on XTPro, refer to the separate XTPro Specification. This section will cover the device-
specific implementation of the XTPro protocol.
6.4.3 XTPro Web Browser-Based Implementation
A representative implementation based upon using a web browser as the client is detailed in Figure 24.
In this scenario, the client application is developed by using an active web server authoring tool (such as
Adobe Flash®). The active content is then embedded into one or more HTML files and loaded onto the
device’s file system (refer to section 6.4.1 for detailed information regarding customization of the web
server content). Accessing the device’s web server via a standard web browser then loads the active
content, which initiates communication with the server.
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