E.2
SEL-551 Relay Instruction Manual Date Code 20110408
Compressed ASCII Commands
CASCII Command—General Format
A Compressed ASCII command may require multiple header and data
configuration lines.
If a Compressed ASCII request is made for data that are not available, (e.g. the
history buffer is empty or invalid event request), the relay responds with the
following message:
<STX>"No Data Available","0668"<CR><ETX>
where:
n = the number of Compressed ASCII command
descriptions to follow.
COMMAND = the ASCII name for the Compressed ASCII command
as sent by the requesting device. The naming
convention for the compressed ASCII commands is a C
preceding the typical command. For example,
CSTATUS (abbreviated to CST) is the Compressed
STATUS command.
11 = the minimum access level at which the command is
available.
#H identifies a header line to precede one or more data
lines; # is the number of subsequent ASCII names. For
example, 21H identifies a header line with 21 ASCII
labels.
#h identifies a header line to precede one or more data
lines; # is the number of subsequent format fields. For
example, 8h identifies a header line with 8 format
fields.
xxxxx = an ASCII name for corresponding data on following
data lines. Maximum ASCII name width is
10 characters.
#D identifies a data format line; # is the maximum number
of subsequent data lines.
ddd identifies a format field containing one of the following
type designators:
I = Integer data
F = Floating point data
mS = String of maximum m characters
(e.g., 10S for a 10-character string)
yyyy = the 4-byte hex ASCII representation of the checksum.
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