F-6
Unsolicited SER Protocol
Date Code 20020129
SEL-387E Instruction Manual
A5 46 0E 00 00 00 00 00 00 82 00 XX cc cc
(XX is the same as the response number in the "Disable Unsolicited Data Transfer"
message to which it responds.)
5. Successful acknowledge message from the master for an unsolicited SER message:
A5 46 0E 00 00 00 00 00 00 98 00 XX cc cc
(XX is the same as the response number in the unsolicited SER message to which it
responds.)
Notes:
Once the relay receives an acknowledge with response code 00 from the master, it will clear the
settings changed bit (bit 1) in its status byte, if that bit is asserted, and it will clear the settings
changed bit in fast meter, if that bit is asserted.
An element index of 0xFE indicates that the SER record is due to power up. An element index
of 0xFF indicates that the SER record is due to setting change. An element index of 0xFD
indicates that the element identified in this SER record is no longer in the SER trigger settings.
When the relay sends an SER message packet, it will put a sequential number (0, 1, 2, 3, 0, 1, ...)
into the response number. If the relay does not receive an acknowledge from the master before
approximately 500 ms, the relay will resend the same message packet with the same response
number until it receives an acknowledge message with that response number. For the next SER
message, the relay will increment the response number (it will wrap around to zero from three).
A single SER message packet from the relay can have a maximum of 32 records and the data
may span a time period of no more than 16 seconds. The master may limit the number of
records in a packet with the third byte of function code data in the “Enable Unsolicited Data
Transfer” message (function code 01). The relay may generate an SER packet with less than the
requested number of records, if the record time stamps span more than 16 seconds.
The relay always requests acknowledgment in unsolicited SER messages (LSB of the status byte
is set).
Unsolicited SER messages can be enabled on multiple ports simultaneously.
Содержание SEL-387E
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