Extron Electronics DVS 510 Series User Guide - Manual (Page 126)

DVS 510 Series • Reference Information 120
Local echo
Once your computer is connected to the DVS 510, 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 scaler.
With local echo turned on, keystrokes and the scaler 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 DVS, and you need to access the Telnet prompt to turn local
echo off, enter the
Escape sequence (< Ctrl + ] >).
Setting carriage return with line feed
Unless commanded otherwise, Telnet transmits a line feed character only (no carriage return)
to the connected scaler when you press the key. This is the correct setting for SIS
communication with the scaler. The Telnet
set crlf command forces Telnet to transmit
carriage return and line feed characters when is pressed; however, if crlf is set, the
SIS link with the scaler does not function properly.
Closing the link to the scaler
To close the link to the scaler, access the Telnet prompt by entering the Escape sequence
( + ]> ). 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 DVS,
access the Telnet prompt by entering the Escape sequence ().
Subnetting, a Primer
A subnet is a subset of a network — a set of IP devices that have portions of their IP
addresses in common. It is not the purpose of this manual to describe TCP/IP protocol
in detail. However, some understanding of TCP/IP subnetting is necessary in order to
understand the interaction of the DVS 510 and the mail server gateway. To understand
subnetting at the level required to install and operate the DVS 510, you must understand the
concepts of a gateway, local and remote devices, IP addresses and octets, and subnet masks
and octets.
Gateways
The DVS 510 Series can communicate with the e-mail server that it uses for e-mail
notification directly (if they are on the same subnet), or its communication can be routed via
a gateway (a computer that provides a link between different subnets).