Extron electronic DVS 304 manual Command and Responses, Using the Command and Response Tables

Command and Responses

Using the Command and Response Tables

The following are either Telnet (port 23) or Web browser (port 80) commands. There are some minor differences when you are 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 tables show proper implementation in a Telnet or Web browser session.

NOTE: 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)	W [must not be encoded]
Carriage Return (Hex 0D)	Pipe Character ( ) [must not be encoded]

When SIS commands are used 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://192.168.254.254/index.html

To send any of the commands using a Web browser you need to prefix them with the full URL followed by ?cmd=. See the “URL Encoding” section, later in this chapter.

NOTE: 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 that is directed to a specified port and must be encoded if non-alphanumeric.

The Command and Response table for SIS commands later in this chapter lists the commands that the DVS 304 scaler 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, and an example of each command in ASCII (Telnet) and URL Encoded (Web).

NOTE: Upper and lower case text can be used interchangeably except where noted.

ASCII to HEX Conversion Table

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Figure 28. ASCII to Hexadecimal Character Conversion Table

DVS 304 Series • SIS Communication and Control 32