3.6
SEL-2701 Ethernet Processor Instruction Manual Date Code 20020501
Settings and Commands
Data Access Settings
and substring is the device name derived from an identification string stored in
the host that is associated with the virtual device. The SEL-2701 uses the first
identification string that it finds in the PORTID, DEVICEID, and FIDID
strings. The same substitution rules that govern substitutions for the host
subdirectory name govern creation of the substring. For example, if you have
an SEL-351 connected to an SEL-2030 on Port 3 with a PORTID setting of
“Feeder 1,” the subdirectory name will be “DD03_Feeder_1.”
Each virtual device subdirectory contains files that represent valid host data
regions associated with the virtual device. Data region files provide snapshots
of the corresponding host database regions. When an FTP client requests the
file, the SEL-2701 sends a file containing values from the host database
region. If the voltage VA is 12.47 kV when you make an FTP request for the
METER.TXT file, then the file METER.TXT will contain VA = 12.47. If you
request the file at another time, when VA is 12.40, the file will contain
VA = 12.40. Two file formats are available, ASCII text and compressed ASCII
(CASCII). Names of the files correspond to the data region name (i.e.
METER.TXT, METER.CAS).
Access Control
FTP settings control some basic file access features. The host is responsible
for maintaining names and passwords for access control. The special FTP user
name “anonymous” does not require a password. It has the same access rights
as the user name in the FTPAUSR setting. For example, if FTPAUSR is set to
ACC, the FTP anonymous user has Access Level 1 rights. See the host-
specific sections for additional information about access rights. Table 3.5 lists
the settings that affect FTP server operation.
NOTE: SEL advises against enabling
anonymous FTP logins (FTPANMS = Y)
except under test conditions. The
SEL-2701 does not require a password
for the special FTP user name
“anonymous.” If you enable
anonymous FTP logins, you are
allowing unrestricted access to the
SEL-2701 and host files.
Telnet
Telnet is also part of the TCP/IP protocol suite. You can use Telnet to establish
terminal access to a remote device. A Telnet connection provides access to the
user interface of either the host or the SEL-2701. Host user interface access is
similar to an ASCII terminal connection to the front port of an SEL device.
You can use Telnet in the SEL-2701 in one of three ways:
1. Connect from your PC to the SEL-2701 user interface.
2. Connect from your PC to the host user interface.
3. Connect from a host to another Telnet server.
Table 3.5 SEL-2701 FTP Settings
Label Description Range Default
FTPSERV
a
a
If you change these settings and accept the new settings, the SEL-2701 closes all active
network connections and briefly pauses network operation.
FTP session enable Y, N N
FTPCBAN FTP connect banner 254 characters SEL-2701 FTP
SERVER:
FTPIDLE
a
FTP connection timeout 5–255 minutes 5
FTPANMS
a
Anonymous login enable Y, N N
FTPAUSR Host user from which anonymous FTP
client inherits access rights
See host-
specific section
Empty String
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