DXP HD 4K PLUS Series • Reference Information 108
Escape character and Esc key
Many SIS commands include the keyboard <Esc> key. Consequently, some confusion may
exist between the Escape character and the <Esc> key.
When Telnet is first started, the utility advises that the Escape character is “Ctrl+
]
.” This
means that the Telnet Escape character is a key combination: the <Ctrl> key and the <]>
key pressed simultaneously. Pressing these keys displays the Telnet prompt while leaving
the connection to the DXP switcher intact.
Local echo
Once your computer is connected to the DXP switcher, by default Telnet does not display
your keystrokes on the screen. SIS commands are entered blindly, and only the SIS
responses are displayed on the screen. To command Telnet to show all keystrokes, enter
set local_echo at the Telnet prompt before you open the connection to the switcher.
With local echo turned on, keystrokes and the switcher responses are displayed on the
same line.
Example: 1*1!In1 Out1 All,
where 1*1! is the SIS command and In1 Out1 All is the response.
Note that all keystrokes are displayed, even those that should be masked, such as the
password entry. For example, when entering a password with local echo turned on, you see
a display such as a*d*m*i*n*, where admin is the keyed-in password and ***** is the
masked response.
Local echo can be turned off by entering unset local_echo at the Telnet prompt. If your
computer is connected to the DXP switcher, and you need to access the Telnet prompt to
turn local echo off, enter the Escape sequence (<Ctrl + ]>).
Setting carriage return-line feed
Unless commanded otherwise, Telnet transmits a line feed character only (no carriage
return) to the connected switcher when you press the <Enter> key. This is the correct
setting for SIS communication with the switcher. The Telnet set crlf command forces
Telnet to transmit carriage return and line feed characters when <Enter> is pressed;
however, if crlf is set, the SIS link with the switcher does not function properly.
Closing the link to the switcher
To close the link to the switcher, access the Telnet prompt by entering the escape
sequence (<Ctrl +
]
>). At the Telnet prompt, enter close.
Help
For Telnet command definitions, enter ? at the Telnet prompt.
Exiting Telnet (Quit command)
Exit the Telnet utility by entering quit at the Telnet prompt. If you are connected to the DXP
switcher, access the Telnet prompt by entering the Escape sequence (<Ctrl +
]>).
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