R.5.6
SEL-421 Relay Reference Manual Date Code 20111215
SEL Communications Protocols
Protocol Active When Setting PROTO := SEL
CASCII Configuration Message for Compressed Level 0 ASCII
Commands
The CASCII message provides a block of data for each of the Compressed
ASCII commands supported by an SEL device. The block of data for each
command provides message description information to allow automatic data
extraction. The relay arranges items in the Compressed ASCII configuration
message in a predefined order. For the purpose of improving products and
services, SEL sometimes changes the items and item order. The information
presented below explains the message and serves as a guide to the items in
Compressed ASCII configuration messages.
A Compressed ASCII command can require multiple header and data
configuration lines. The general format of a Compressed ASCII configuration
message is the following:
<STX>"CAS",n,"yyyy"<CR><LF>
"COMMAND 1",ll,"yyyy"<CR><LF>
"#H","xxxxx","xxxxx",......,"xxxxx","yyyy"<CR><LF>
"#D","ddd","ddd","ddd","ddd",......,"ddd","yyyy"<CR><LF>
•
•
•
"COMMAND n",ll,"yyyy"<CR><LF>
"#H","xxxxx","xxxxx",......,"xxxxx","yyyy"<CR><LF>
"#D","ddd","ddd","ddd","ddd",......,"ddd","yyyy"<CR><LF><ETX>
Definitions for the items and fields in a Compressed ASCII configuration
message are the following:
➤ n is the number of Compressed ASCII command descriptions
to follow.
➤ COMMAND is the ASCII name for the Compressed ASCII
command that the requesting device (terminal or external
software) sends. The naming convention for the Compressed
ASCII commands is a C character preceding the typical
command. For example, CSTATUS, abbreviated to CST, is the
Compressed ASCII STATUS command.
➤ #H identifies a header line to precede one or more data lines; the
# character represents the number of subsequent ASCII names.
For example, 21H identifies a header line with 21 ASCII labels.
➤ xxxxx is an ASCII name for corresponding data on following
data lines. Maximum ASCII name width is 10 characters.
➤ #D identifies a data format line; the # character represents the
maximum number of data lines in command response.
➤ ddd identifies a format field containing one of the following
type designators:
➢ I—Integer data
➢ F—Floating point data
➢ zS—String of maximum z characters (for example,
enter 10S for a 10-character string)
ID Relay identification 0
SNS ASCII names for SER data reported in Fast Meter 0
Table 5.4 Compressed ASCII Commands (Sheet 2 of 2)
Command Response Access Level
NOTE: Compressed ASCII is
self-describing and may vary with the
firmware version of your relay. Before
you program a master device to send
and parse Compressed ASCII
commands and responses, you should
perform a CASCII command on your
relay or contact SEL for more
detailed information.
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