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Communication and Control, cont’d
IPL T S Series • Communication and Control
4-20
<!--#echo var=" "-->W
Delimiter
Delimiter
SIS Command
Server Side Include Using a Remote SIS command
*Type with no spaces.
Port
Number
1 * * *
Time to
wait for
first character
of response
50
Time
between
characters
in response
3
Command
RS
Length or
Delimiter
parameter
3L
Hello
Data to be
passed to
external device
via a serial port
SIS Command
Elements
Figure 4-2 — Example of an SSI “remote” command
In the example above, a “remote” serial command sends the word “Hello” and
waits up to 50 ms for a response (until three characters are received). For more
information on this command, see the “Command/response table for Simple
Instruction Set (SIS) commands”, earlier in this chapter.
Query string
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”>Input #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 S interface
removes and executes.
As with SSI formatted commands, query strings can use any valid SIS command —
either “host” or “remote”.
The query string in the figure below turns off DHCP on the IP Link device.
<a href="index.html ?
Starts
Query String
SIS Command
URL with a Query String using a Host SIS command
*Type with no spaces.
Tells Web server
an SIS command
follows
HTML code
for a link
cmd=
SIS command
to be processed
by the IP Link
W0DH|
Closes
Link
</a>
HTML code
for a link
">
Linked Text
DHCP off
Figure 4-3 — Example of a host query string command
<a href="index.html ?
Starts
Query String
SIS Command
URL with a Query String using a Remote SIS command
*Type with no spaces.
Tells Web
server an
SIS command
follows
HTML code
for a link
cmd=
Closes
Link
</a>
HTML
code
for a link
">
Linked
Text
Input #1W
Delimiter
Port
Number
2
Command
RS
Delimiter
1!
Data to
be passed to
external device
via a serial port
Figure 4-4 — Example of a remote query string command
In the figure above, the data string that follows the pipe
(
|
)
symbol is sent to the
attached controlled device on serial port #2. This string instructs an attached
Extron switcher to change to input #1.