I-4
Unsolicited Fast SER Protocol
Date Code 20011205
SEL-311A Instruction Manual
Data Description
A546 Message
header
ZZ
Message length (Up to 34 + 4 · nn decimal, where nn is the maximum number
of SER records allowed per message as indicated in the “Enable Unsolicited
Data Transfer” message.)
0000000000
Five bytes reserved for future use as a routing address.
YY
Status Byte (01 = need acknowledgment; 03 = settings changed and need
acknowledgment. If YY=03, the master should re-read the SNS data because
the element index list may have changed. )
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
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