7.8
SEL-734 Meter Instruction Manual Date Code 20090730
Time-Synchronized Measurements
Synchrophasor Measurements
Once the enable message is sent, the device will respond either with an
acknowledge message followed by streaming synchrophasor data, or just
streaming synchrophasor data, depending on the value of the YY status byte
shown in Table 7.6. Note that the device only sends synchrophasor data out
the port that receives the enable message, and the PMDATA and PMADDR
settings are specific to each port.
Disable Synchrophasor Fast Messaging
A binary disable message, similar to the enable message, must be sent to the
transmitting port to stop the synchrophasor messages. Tab le 7.7 describes the
packet for disabling the unsolicited synchrophasor Fast Messages. Once the
message is sent, the meter will revert to a standard ASCII terminal port, and
normal meter communications may resume.
Table 7.6 Unsolicited Fast Message Enable Packet
Field Description Hex Data
Header Synchrophasor Fast Message A546
Frame Size 18 bytes 12
Routing Must be 0000000000 for this application 0000000000
Status Byte YY = 00 acknowledge is not requested
YY = 01 acknowledge is requested
YY
Function Code 01h Enable unsolicited write messages 01
Sequence C0 for single frame message.
Maximum frame size 255 bytes
C0
Response Number XX = 00, 01, 02, 03 XX
Application 20h Synchrophasor 20
Reserved 00
Reserved 00
Message Rate Message transmission rate nn
Check Word 2-byte CRC-16 check code for message XXXX
Table 7.7 Unsolicited Fast Message Disable Packet
Field Description Hex Data
Header Synchrophasor Fast Message A546
Frame Size 16 bytes 10
Routing Must be 0000000000 for this application 0000000000
Status Byte YY = 00 acknowledge is not requested
YY = 01 acknowledge is requested
YY
Function Code 02h Disable unsolicited write messages 02
Sequence C0 for single frame message;
maximum frame size 255 bytes
C0
Response Number XX = 00, 01, 02, 03 XX
Application 20h Synchrophasor 20
Reserved 00
Check Word 2-byte CRC-16 check code for message XXXX
Courtesy of NationalSwitchgear.com
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