Campbell Scientific CR6 CR6 Measurement and Control System - Page 293
Custom HTTP Web Server
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Figure 76. Preconfigured HTML Home Page Section 7. Installation 7.9.20.3 Custom HTTP Web Server Although the default home page cannot be accessed 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 CR6 drive with File Control. Deleting default.html will cause the CR6 to use its original, default home page. The CR6 can be programmed to generate HTML or XML code that can be viewed by the web browser. CRBasic example HTML (p. 295) 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 is replaced by using WebPageBegin 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. 294). The Campbell Scientific logo in the web page comes from a file called SHIELDWEB2.JPG. That file must be transferred to the CR6 CPU: drive using File Control in the datalogger support software. The CR6 can then access the graphic for display on the web page. A second web page, shown in figure Customized Numeric-Monitor Web Page (p. 294) called "monitor.html" was created by the example program that contains links to the CR6 data tables. 293
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