15.30
SEL-400 Series Relays Instruction Manual Date Code 20171006
Communications Interfaces
SEL Protocol
The SEL Fast Message Synchrophasor Protocol is described in Section 18: Syn-
chrophasors.
Recommended Use of Relay Self-Description Messages for Automatic
Configuration
Compressed ASCII and Fast Message commands provide information to allow an
external computer-based device to adapt to the special messages for each relay.
The SEL communications processors use the self-description messages to config-
ure a database and name the elements in the database.
Table 15.22 lists commands and command usage in the recommended order of
execution for automatic configuration.
98h Fast SER Message acknowl-
edge
Relay completes dialog processing for unso-
licited message sequence.
30h Device description request Relay sends summary of data blocks avail-
able (Function Code B0h).
31h Data format request Relay sends description of requested data
block, including data labels and types (Func-
tion Code B1h).
33h Bit label request Relay sends set of bit labels for specific data
item (Function Code B3h).
10h Data request Relay responds with set of requested data
(Function Code 90h).
Table 15.21 Fast Message Command Function Codes Used With Fast Messages
(A546 Message) and Relay Response Descriptions (Sheet 2 of 2)
Function
Code (Hex)
Function Relay Action
Table 15.22 Commands in Recommended Sequence for Automatic
Configuration
Command ASCII or
hexadecimal (h suffix)
Response Usage
ID Relay identification ID and FID
A5C0h Relay Fast Meter definition
block
Defines available Fast Meter mes-
sages and general relay configuration
information
A5C1h, A5C2h,
A5C3h
Fast Meter configuration
blocks
Defines contents of Fast Meter data
messages
BNAME Binary names ASCII names of status bits
DNAME Digital I/O name ASCII names of digital I/O points
SNS SER names ASCII names for SER data points
CASCII Compressed ASCII configu-
ration block
Configuration data for Compressed
ASCII commands with access levels > 0
A5CEh Fast Operate configuration
block
Defines available circuit breaker and
remote bits, and associated commands,
if setting FASTOP :=Y for this port
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