Extron Electronics IPL T SFI244 - Manual (Page 48)

Customization
You can use various methods to make the IPL T SFI244 interface perform customized
functions or to alter the unit’s embedded Web pages. Server Side Includes (SSIs) make it
possible to send commands to the IPL T SFI244 itself, or to devices connected to its control
ports. Customization is also possible by writing query strings and inserting them into Web
pages stored on the IPL T SFI244.
Server Side Includes
Server Side Includes are a type of HTML comment that dynamically directs the IPL T SFI244
as to what material or files to include in the contents of a Web page or to send out to one
of the unit’s ports. SSIs can include embedded instructions (scripts) and style sheets (to set
up page layout), and also specify what information to insert into the Web pages. These
instructions run on the unit’s internal Web server. Server Side Includes use Extron Simple
Instruction Set (SIS) commands to ask for and display information from the IPL T SFI244,
itself. When a Web page is requested, the IPL T SFI244 replaces the SSI command with
the response to the SIS command.
SIS command types and syntax
SIS commands sent to IP Link-enabled products fall into two categories: host or remote.
• Host commands instruct the IPL T SFI244, itself, to act or respond.
• Remote commands send data to an external control port on the IPL T SFI244.
The basic format for a Server Side Include is as follows:
where
• “directive” is an instruction to the server such as include file (to include/insert
the content of one document into another file) or echo var (to display a particular
HTTP variable).
• The variable ( x) is one or more SIS command(s) enclosed in quotation marks (“x”).
IPL T SFI244 • Communication and Control 42