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13.3
SYNCHRONIZATION
To synchronize a relay we use a command with the following characteristics:
We execute in broadcast, that is, we send the message to all the units in the network (relay address = 00H).
We include the date and time in the message. The length of the date and time format is 6 bytes, indicating the
number of milliseconds passed from a base date, 1/1/96 at 00:00:00.000.
When we broadcast a message, we do not get an answer from the relay.
FIELD
LENGTH
Relay address
1 Byte (00H – Broadcast)
Function
1 Byte (10H)
Beginning
1 word (0000H) (High byte – low byte)
No. of records
1 word (0004H) (High byte – low byte)
No. of bytes
1 Byte (08H) (High byte – low byte)
Value of the records
Record1=>Command code (High byte – low byte).
Record2..4=>Date and time.
CRC
1 word
Example
For sending the date and time of the 31
the base date/time:
107,690,464,224 Decimal = 00 19 12 DA 13 E0 Hexadecimal.
Reordering for sending the lowest size byte first: E0 13 DA 12 19 00
ADDRESS
FUNCTION
00
10
13-4
ANNEX 3 MODBUS MEMORY MAP
st
of May, 1999 at 10:01:04.224, that is, 107,690,464,224 milliseconds from
BEGINNING #REGS
00 00
00 04
MIF Digital Feeder Protection
#BYTES
COMMAND
08
FE 00
VALUE
CRC
E0 13 DA 12 19 00
ECFC
GEK-106273L
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