User`s manual

IPL T SF Series • Communication and Control
Communication and Control, cont’d
Customization
In the IPL T SF interface family, varying degrees of
customization are possible. Server Side Includes make it
possible to obtain information from the unit and display
the information on Web pages. URL encoding allows you
to send information and commands to the unit to change its
configuration or provide you with feedback.
Server Side Includes
Server Side Includes (SSIs) 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 Extron’s
Simple Instruction Set (SIS) to communicate commands to
the products or attached control devices. Using SSIs, custom
pages can be designed and displayed, with IPL T SF interface
information provided by the SIS commands.
The basic format for an Extron SSI is
<!—#echo var=”x”—>
Where x is the SIS command to be executed.
The SIS instructions sent to IP Link-enabled products fall into
two categories: “host” or “remote”.
• Host commands instruct the IP Link product to act or
respond.
• Remote commands pass data to an external control port
on an IP Link product.
When a Web page is requested, the Web server removes the
SSI and replaces it with the answer to the SIS command within
quotes.
Figure 4-21 — Example of SSI “host” command
In figure 4-21 above, the “N” command is used to request the IP
Link product’s part number.
<!--#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
4-32