R.5.11
Date Code 20111215 Reference Manual SEL-421 Relay
SEL Communications Protocols
Virtual File Interface
Virtual File Interface
You can retrieve and send data as files through the SEL-421 virtual file
interface. 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 a communications card, the file transfer protocol(s)
supported by the card can present the file structure and send and receive files.
The SEL-421 has a two-level file structure. There is one file at the root level
and three subdirectories or folders. Table 5.9 shows the directories and the
contents of each directory.
System Data Format
(SDF)
All files use the SDF (System Data Format) unless otherwise 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 distinguish these double quotes from the quotes that surround the
field string. Delimiters are spaces and commas that are not contained within
double quotes. Two adjacent commas indicate an empty string, but spaces that
appear next to another delimiter are ignored.
CASCII Compressed ASCII
configuration block
Configuration data for
Compressed ASCII commands
with access levels > 0
A5CEh Fast Operate configura-
tion block
Defines available circuit breaker
and remote bits, and associated
commands, if setting FASTOP
:=Y for this port
Table 5.8 Commands in Recommended Sequence for Automatic
Configuration (Sheet 2 of 2)
Command ASCII or
hexadecimal (h suffix)
Response Usage
Table 5.9 Virtual File Structure
Directory Usage
Access
Level
root CFG.TXT file, and the SETTINGS, REPORTS, and
EVENTS directories (below)
1
SETTINGS Relay settings 1
REPORTS SER, circuit breaker, and history reports 1
EVENTS EVE, CEV, COMTRADE and history reports 1
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