User`s manual

IPL T SF Series • Communication and Control
Figure 4-22 — Example of SSI “remote” command
In figure 4-22 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 “Programmer’s Guide for the Telnet and
Web Browser,” 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 IP Link product
will remove and execute.
As with SSI formatted commands, query strings can use any
valid SIS command—either “host” or “remote”.
The query string in figure 4-23 below turns off DHCP on the IP
Link device.
Figure 4-23 — Example of a host query string
command
<!--#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
5
Time between
characters
in response
3
Command
RS
Length or
Delimiter
parameter
3L
SIS Command
Elements
Hello
Data to be passed to
external device
via a serial port
<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
the an SIS 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
4-33