Extron electronic IPL T S Series manual Query string, Href=index.html?cmd=xInput #1/a

Communication and Control, cont’d

Server Side Include Using a Remote SIS command

			SIS Command
<!--#echo var=" W 1		* 50 *	3 *	3L RS		Hello "-->
Delimiter	Port	Time to	Time	Length or Command	Delimiter
						Data to be
	Number	wait for	between	Delimiter		passed to
		first character	characters	parameter		external device
		of response	in response			via a serial port

SIS Command

Elements

*Type with no spaces.

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, refer to 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.

URL with a Query String using a Host SIS command
				SIS Command
<a href="index.html		?	cmd=	W0DH	">	DHCP off </a>
HTML code	Starts		Tells Web server	SIS command	HTML code	Linked Text	Closes
	Query String
for a link			an SIS command	to be processed	for a link		Link
			follows	by the IP Link
						*Type with no spaces.

Figure 4-3 — Example of a host query string command

URL with a Query String using a Remote SIS command

SIS Command

<a href="index.html ? cmd= W 2 RS 1! "> Input #1 </a>

HTML code

for a link

Starts	Tells Web	Delimiter	Port Command	Delimiter Data to
Query String
	server an		Number	be passed to

SIS command	external device
follows
	via a serial port

HTML	Linked	Closes
code	Text	Link
for a link

*Type with no spaces.

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.

4-20 IPL T S Series • Communication and Control