D.8
SEL-311C Relay Instruction Manual Date Code 20060320
Configuration, Fast Meter, and Fast Operate Commands
Message Definitions
A5D2/A5D3 Demand/
Peak Demand Fast
Meter Message
In response to the A5D2 or A5D3 request, the relay sends the block shown in
Table D.7.
A5B9 Fast Meter
Status Acknowledge
Message
In response to the A5B9 request, the relay clears the Fast Meter (message
A5D1) Status Byte. The SEL-311C Status Byte contains one active bit,
STSET (bit 4). The bit is set on power up and on settings changes. If the
STSET bit is set, the external device should request the A5C1, A5C2, and
A5C3 messages. The external device can then determine if the scale factors or
line configuration parameters have been modified.
FF Scale factor type
0000 Scale factor offset in Fast Meter message
51432D000000 Analog channel name (QC-)
02 Analog channel type
FF Scale factor type
0000 Scale factor offset in Fast Meter message
51332D000000 Analog channel name (Q3-)
02 Analog channel type
FF Scale factor type
0000 Scale factor offset in Fast Meter message
00 Reserved
checksum 1-byte checksum of preceding bytes
Table D.6 A5C2/A5C3 Demand/Peak Demand Fast Meter
Configuration Messages (Sheet 4 of 4)
Data Description
Table D.7 A5D2/A5D3 Demand/Peak Demand Fast Meter Message
Data Description
A5D2 or A5D3 Command
B6 Length
1 byte 1 Status Byte
168-bytes Demand: IA, IB, IC, IG, 3I2, MWA I,
MWB I, MWC I, MW3PI, MVA I, MVB I,
MVC I, MV3PI, MWA O, MWB O, MWC O, MW3PO,
MVA O, MVB O, MVC O, MV3PO in 8-byte IEEE FPS
8 bytes Time stamp
1 byte Reserved
1 byte 1-byte checksum of all preceding bytes
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