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Custom Web Pages
On the IPL T PC1, custom web pages are supported. You can determine the layout and
appearance of the pages displayed on your screen. Server side includes (SSIs) enable you to
obtain information from the unit and display the information on web pages. Query strings
allow you to send information and commands to the unit to change its configuration or
provide you with feedback (see “Query strings,” below).
Server Side Includes (SSIs)
Server side includes are a type of HTML comment that directs the web server to dynamically
generate data for a web page whenever it is requested. SSIs typically use SIS commands to
communicate with the products or attached control devices. Using SSIs, you can design and
display custom pages, with PC1 information provided by the SIS commands (see the “SIS
Programming and Control” section for these commands).
The basic format for an Extron SSI is <!—#echo var=”x”—>, where x is the SIS command to
be executed.
When a web page is requested, the web server removes the SSI and replaces it with the
answer to the SIS command within quotes.
<!--#echo var=" "-->
SIS Command
Server Side Include Using
the Host SIS command
*type with no spaces
SIS command
to be processed
by the IP Link
N
Figure 32. Example of the SSI Command
In the figure above, the N command is used to request the PC1 part number.
Query strings
A query string is the portion of a URL that appears after the question mark. The query string
contains parameters or instructions for the web server to execute. The basic format for a
query string within a link is:
<a href=”index.html?cmd=x”>Receptacle 1</a>
where x is the SIS command to be executed.
When a link is accessed on a web page, the URL is passed to the web server to tell it which
web page to return to the browser. The portion of the URL after the question mark is the
query string, which contains the SIS command that the IPL T PC1 will remove and execute.
Like SSI formatted commands, query strings can use any valid SIS command.
The query string in the figure below turns off DHCP on the IP Link device.
<a href="index.html
?
Starts
query string.
*Enter with no spaces.
Tells web server
that SIS
command follows.
HTML Code
for a Link
cmd=
SIS Command
To Be Processed
by the IP Link
W1*1PC|
Closes
link.
</a>
HTML Code
for a Link
">
Linked Text
Receptacle on
SIS Command*
Figure 33. Example of a URL with a Query String Using an SIS Command
IPL T PC1 • HTML Configuration and Control 40