Schweitzer Engineering SEL-387-0, Instruction Manual

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F.4
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Unsolicited SER Protocol
Functions and Function Codes
If the relay determines that SER records have been lost, it sends a message
with the following format:
YY Status Byte (01 = need acknowledgment;
03 = settings changed and need acknowledgment)
18 Function code
C0 Sequence byte (Always C0.
Other values are reserved for future use in multiple frame messages.)
XX Response number (XX = 00, 01, 02, 03, 01, 02...)
00000000 Four bytes reserved for future use as a return routing address
dddd Two-byte day of year (1–366)
yyyy Two-byte, four-digit year (e.g., 1999 or 07CF hex)
mmmmmmmm Four-byte time of day in milliseconds since midnight
XX 1st element index (match with the response to the SNS command;
00 for 1st element, 01 for second element, and so on)
uuuuuu Three-byte time tag offset of 1st element in microseconds
since time indicated in the time of day field
XX 2nd element index
uuuuuu Three-byte time tag offset of 2nd element in microseconds since time
indicated in the time of day field
.
.
.
xx last element index
uuuuuu Three-byte time tag offset of last element in microseconds since time
indicated in the time of day field
FFFFFFFE Four-byte end-of-records flag
ssssssss Packed four-byte element status for up to 32 elements (LSB for the 1st
element)
cccc Two-byte CRC-16 checkcode for message
Data Description
A546 Message header
22 Message length (34 decimal)
0000000000 Five bytes reserved for future use as a routing address.
YY Status Byte (01 = need acknowledgment;
03 = settings changed and need acknowledgment)
18 Function code
C0 Sequence byte (Always C0.
Other values are reserved for future use in multiple frame messages.)
XX Response number (XX = 00, 01, 02, 03, 00, 01, ...)
00000000 Four bytes reserved for future use as a return routing address
dddd Two-byte day of year (1–366) of overflow message generation
yyyy Two-byte, four-digit year (e.g., 1999 or 07CF hex)
of overflow message generation.
Data Description