R.4.10
SEL-421 Relay Reference Manual Date Code 20111215
Communications Interfaces
Communications Card
3. Connect from a host to another Telnet server.
To determine which modes are available in your installation, see the host-
specific section. The Ethernet card acts as a Telnet server for connections to
the Ethernet card user interface. The user interface provides access to
commands for diagnostics and other special features of the Ethernet card.
Telnet settings are listed in Tab le 4. 8.
Ethernet Card
Commands
The SEL-421 Ethernet card user interface accepts Ethernet card commands.
There are two ways you can connect to the Ethernet card. First, if your host
allows, you can make a transparent connection to the Ethernet card. Second,
you can establish a Telnet connection to the Ethernet card user interface. See
the host-specific sections for more information on connecting to the Ethernet
card user interface. Other connections to the Ethernet card, including FTP,
require standard protocol commands and do not respond to the Ethernet card
user-interface commands.
Using Commands
When you type commands, you can type in either the entire command or just
use the first three letters. For example, if you type STATUS <Enter> or STA
<Enter>, the Ethernet card displays status information. Commands are not
case sensitive; you may use upper- or lowercase characters. Access level
password entry is case sensitive. Table 4.10 summarizes the user commands.
As with serial ports on SEL devices, you can control character transmission in
a Telnet session using control characters. Send the control characters listed in
Tab le 4.9 to control long transmissions like event reports and SER reports.
Tab le 4 .8 Eth er ne t Card Tel ne t S ettin gs
Label Description Range Default
T1CBAN Host Telnet connect banner 254 characters HOST
TERMINAL SERVER:
T1INIT Telnet session from host
enable
Y, N Y
T1RECV Telnet session to host enable Y, N N
T1PNUM
a
a
If you change these settings and accept the new settings, the Ethernet card closes all active
network connections and briefly pauses network operation.
Host Telnet TCP/IP port 1–65534
except 20, 21, 102
23
T2CBAN Ethernet card Telnet connect
banner
254 characters CARD TERMINAL
SERVER:
T2RECV Telnet session to Ethernet
card enable
Y, N N
T2PNUM
a
Ethernet card Telnet TCP/IP
port
1–65534
except 20, 21, 102
1024
TIDLE Telnet connection timeout
(0 prevents timeout)
0–255 minutes 5
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