Extron electronics IP Link IPL T CR48, User Manual

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Programmer Guide for the Telnet and Web Browser
Using the Command and Response Table
The following are either Telnet (port 23) or web browser (port 80) commands. There
are some minor differences when implementing these commands via Telnet or via URL
encoding using a web browser. All commands listed below will work using either connection
method, but due to some limitations of the web browser, the encapsulation characters are
modified to make sure that the web browser will properly handle them. All examples in the
Command and Response Table for SIS Commands
starting on page 27 show the
proper implementation in a Telnet or web browser session.
NOTE:
For web browsers, all non-alphanumeric characters must be represented as their
hex equivalent such as
% xx
where
xx
equals the two character representation of the
hex byte that needs to be sent (for example, a comma would be represented as
%2C
).
Telnet Web Browser
Escape (Hex
1B
)
Carriage Return (Hex
0D
)
W
[must not be encoded]
Pipe Character ( | ) [must not be encoded]
When using these commands through a web browser, the URL reference is used below to
shorten the examples. This would, in practice, be the full URL of the control interface and
web page reference including all path information (for example,
http://192.168.100.10/myform.htm
).
To send any of the commands using a web browser, you need to prefix them with the full
URL followed by
?cmd
= (see URL Encoding on page 25).
NOTE: With Telnet you can use either the
<Esc>
character or the
<W>
character, and the
carriage return or the pipe character. With the web browser, you are required to use the
W
character and the pipe character.
In either method {Data} signifies that data will be directed to a specified port and must be
encoded if it is non-alphanumeric.
The
Command and Response Table for SIS Commands lists the commands that the
IPL T CR48 recognizes as valid, the responses that are returned to the host, a description of
the function of each command, and the results of executing the command.
NOTE: Upper and lower case text can be used interchangeably except where noted.
Symbol definitions are shown below. An ASCII to HEX conversion table is also provided in
figure 20.
ASCII to Hex Conversion Table
•
Space
Figure 20. ASCII-to-HEX Conversion Table
20
IPL T CR48 • Communication and Control 23