Extron Electronics Annotator User Guide - Manual (Page 106)

Local echo
Once your computer is connected to the Annotator, 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 processor.
With local echo turned on, keystrokes and the processor’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 Annotator, 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 processor when you press the key. This is the correct
setting for SIS communication with the processor. 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 processor does not function properly.
Closing the link to the processor
To close the link to the processor, 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
Annotator, access the Telnet prompt by entering the escape sequence ( + <]>).
Subnetting Basics
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 Annotator and the mail server gateway. To understand
subnetting at the level required to install and operate the Annotator, you must understand
the concepts of a gateway, local and remote devices, IP addresses and octets, and subnet
masks and octets.
Gateways
The Annotator can communicate with the e-mail server that it uses for e-mail notification
directly (if they are on the same subnet), or the communication can be routed via a
gateway (a computer that provides a link between different subnets).
Local and remote devices
The local and remote devices are defined from the point of view of the function being
described. In this manual, subnetting is an issue when you are using the controlling PC to
set TCP/IP values in the Annotator.
Annotator • Ethernet Connection 100