15.18
SEL-400 Series Relays Instruction Manual Date Code 20171006
Communications Interfaces
Virtual File Interface
When enabled, the HTTP server opens TCP/IP Port 80 by default. Set HTTPPOR
to configure any other port as needed.
Virtual File Interface
You can retrieve and send data as files through the virtual file interface of the
relay. Devices with embedded computers can also use the virtual file interface.
When using serial ports or virtual terminal links, use the FILE DIR command.
When you use an Ethernet card, the FTP protocol supported by Ethernet presents
the file structure and sends and receives files.
The relay has a two-level file structure. There are a few files at the root level and
three or more subdirectories or folders. Some SEL-400 series relays support
directories in addition to those listed here. Table 15.11 shows the directories and
the contents of each directory.
System Data Format
Settings files and the CFG.TXT file use the system data format (SDF) unless oth-
erwise specified. The files may contain keywords to aid external support software
parsing. A keyword is defined as a string surrounded by the open and close
bracket characters, followed by a carriage return and line feed. Only one keyword
is allowed per line in the file. For example, the keyword INFO would look like
this in the file: [INFO]<CR><LF>.
Records are defined as comma-delimited text followed by a carriage return and
line feed. One line in a text file equals one record. Fields are defined as comma-
delimited text strings.
Comma-Delimited Text Rules
Field strings are separated by commas or spaces and may be enclosed in optional
double quotation marks. Double quotes within the field string are repeated to dis-
tinguish these double quotes from the quotes that surround the field string.
Table 15.10 Web Server Settings
Label Description Range Default
EHTTP Enable or disable Web Server Y, N N
HTTPPOR Web Server TCP/IP Port Number 1–65535 80
HIDLE Web server inactivity time-out (minutes) 1–30 5
Table 15.11 Virtual File Structure
Directory Usage Access Level
Root CFG.TXT file, CFG.XML
a
file, SWCFG.ZIP file
and the following directories
a
Present only if the optional Ethernet card is installed.
1
SETTINGS Relay Settings 1
REPORTS SER, circuit breaker, protection and history reports 1
EVENTS EVE, CEV, COMTRADE and history reports 1
SYNCHROPHASORS
b
b
Only present in SEL-400 series relays that support synchrophasors.
Synchrophasor recording files 1
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