Campbell Scientific CR3000 CR3000 Micrologger - Page 173
Custom HTTP Web Server
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Section 7. Installation Figure 56: Preconfigured HTML Home Page 7.8.2.3 Custom HTTP Web Server Although the default home page cannot be accessed by the user for editing, it can be replaced with the HTML code of a customized web page. To replace the default home page, save the new home page under the name default.html and copy it to the datalogger. It can be copied to a CR3000 drive with File Control. Deleting default.html will cause the CR3000 to use its original, default home page. The CR3000 can be programmed to generate HTML or XML code that can be viewed by the web browser. CRBasic example HTML (p. 175) shows how to use the CRBasic instructions WebPageBegin() / WebPageEnd and HTTPOut() to create HTML code. Note that for HTML code requiring the use of quotation marks, CHR(34) is used, while regular quotation marks are used to define the beginning and end of alphanumeric strings inside the parentheses of the HTTPOut() instruction. For additional information, see the CRBasic Editor Help. In this example program, the default home page was replaced by using the WebPageBegin() instruction to create a file called default.html. The new default home page created by the program appears as shown in figure Home Page Created Using WebPageBegin() Instruction (p. 174) . The Campbell Scientific logo in the web page comes from a file called SHIELDWEB2.JPG. That file must be transferred to the CR3000 CPU: drive using File Control. The CR3000 can then access the graphic for display on the web page. A second web page, shown in figure Customized Numeric-Monitor Web Page (p. 174) called monitor.html was created by the example program that contains links to the CR3000 data tables. 173
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