R.5.10
SEL-421 Relay Reference Manual Date Code 20111215
SEL Communications Protocols
Protocol Active When Setting PROTO := SEL
The SEL Fast Message Synchrophasor protocol is covered in Section 7:
Synchrophasors.
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 configure a database and name the elements in the database.
Tab le 5.8 lists commands and command usage in the recommended order of
execution for automatic configuration.
Table 5.7 Fast Message Command Function Codes Used With Fast SER
(A546 Message) and Relay Response Descriptions
Function
Code (Hex)
Function Relay Action
00h Fast SER message definition
block request
Relay transmits Fast SER definition
request acknowledge (Function
Code 80).
01h Enable unsolicited transfers Relay transmits Fast SER command
acknowledged message (Function Code
81) and sets relay element bit FSERx.
Relay will transmit subsequent SER
events (Unsolicited SER broadcast,
Function Code 18).
02h Disable unsolicited transfers Relay sends Fast SER command
acknowledged message (Function
Code 82) and clears relay element bit
FSERx. Relay will not transmit subse-
quent SER messages.
05h Ping; determine channel is
operable
Relay aborts unsolicited message in
progress and transmits ping acknowl-
edge message (Function Code 85).
98h Fast SER message
acknowledge
Relay completes dialog processing for
unsolicited message sequence.
Table 5.8 Commands in Recommended Sequence for Automatic
Configuration (Sheet 1 of 2)
Command ASCII or
hexadecimal (h suffix)
Response Usage
ID Relay identification ID and FID
A5C0h Relay Fast Meter defini-
tion block
Defines available Fast Meter
messages 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
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