Extron Electronics ISM 482 - Manual (Page 78)

ISM 482 Integrated Scaling Matrix Switcher • Ethernet Connection 72
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 Escape key.
The Telnet Escape character is a key combination, the
Ctrl
key and the ] key pressed
simultaneously, that returns you to the Telnet prompt while leaving the connection to the ISM
intact.
The Escape key is the
Esc
key on the computer keyboard.
Local echo
Once the computer is connected to the ISM, by default Telnet does not display your
keystrokes on the screen. SIS commands are typed in blindly and the SIS responses are
displayed on the screen. To command Telnet to show keystrokes, type
set local_echo at
the Telnet prompt, and then press
Enter
before you open the connection to the switcher.
With local echo turned on, keystrokes and the switcher’s response are displayed on
the same line. For example:
1*1!In1 Out1 All , where 1*1! is the SIS command and
In1 Out1 All is the response.
With local echo turned on, 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 typing
unset local_echo and then pressing
Enter
at the
Telnet prompt. If you are connected to the ISM and need to access the Telnet prompt to
turn local echo off, type the Escape character (
Ctrl
+ ] ).
Set carriage return-line feed
Unless commanded otherwise, Telnet transmits a line feed character only (no carriage
return) to the connected ISM 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, but if crlf is set, the SIS link
with the switcher does not function properly. Do not set crlf on. If necessary, issue the
unset crlf command to turn off crlf.
Close
To close the link to the switcher, access the Telnet prompt by typing the Escape character
(
Ctrl
+ ] ). At the Telnet prompt, type close and then press
Enter
.
Help
For Telnet command definitions, at the Telnet prompt, type ? and then press
Enter
.
Quit
Exit the Telnet utility by typing quit and then press
Enter
at the Telnet prompt. If you are
connected to the ISM, access the Telnet prompt beforehand by typing the Escape character
(
Ctrl
+ ] ).