IPL T CR48 • Communication and Control
Communication and Control, cont’d
Programmer’s Guide for the Telnet and Web
Browser
Using the command/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 modied
to make sure that the Web browser will properly handle them.
All examples in the command/response table show the proper
implementation in a Telnet or Web browser session.
N 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
(e.g., a comma would be represented as %2C).
Telnet
Web Browser
Escape (Hex 1B) W [must not be encoded]
Carriage Return (Hex 0D) 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
(e.g., http://192.168.100.10/myform.htm).
To send any of the commands using a Web browser you need
to prex them with the full URL followed by ?cmd= (See URL
Encoding later in this chapter).
N With Telnet you can use either the “Escape” commands
or the “W” commands, and the carriage return or the
pipe character. With the Web browser, you are required
to use the “W” commands and the pipe character.
In either method {Data} = Data will be directed to a specied
port and must be encoded if non-alphanumeric.
The table on pages 4-15 through 4-19 lists the commands that
the IPL T interface recognizes as valid, the responses that are
returned to the host, a description of the command’s function, or
the results of executing the command.
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