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Escape character and Esc key
When Telnet is first started, the utility advises that the Escape character is 'Ctrl+]'.
Many SIS commands include the keyboard Esc key. Consequently, some confusion
may exist between the Escape character and the Esc key.
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 SMX switcher intact.
The Escape key, used for SIS commands, is the Esc key on the computer keyboard.
Local echo
Once your computer is connected to the SMX 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's responses are displayed
on the same line. Example: 1*1*1!01Out01 In01 All where 1*1*1! is the SIS
command and 01Out01 In01 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 SMX 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 SMX switcher, access the Telnet prompt by entering the Escape sequence
(Ctrl + ]).
SMX System MultiMatrix Switchers • Ethernet Connection
A-7
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