
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
. 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.
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
Содержание SEL-734
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