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13.2
COMMAND EXECUTION
Commands are executed in two steps: selection and confirmation. First, we must send the command or operation
selection command, to verify that it is available. If so, we will send the confirmation. The structure for both commands
is the same, the only variation is the associated code.
®
The MODBUS
function code used for the execution of operations is 16 (10H) in the hexadecimal value associated to
the function (PRESET MULTIPLE SETPOINTS). As it is a writing, we must give an address where the command will
be written. By default this address is 0 (0000H) for all commands.
The implemented commands are as follows:
LEDs and latched outputs reset
Change to Table 1
Change to Table 2
Oscillography trigger
Open breaker
Close breaker
Time synchronization
Setting change
SELECTION:
Request:
FIELD
LENGTH
Relay address
1 Byte
Function
1 Byte (10H)
Beginning
1 word (0000H) (High byte – low byte)
No. of records
1 word (0001H) (High byte – low byte)
No. of bytes
1 Bytes (02H)
Value of the records
Record1=>Command code (High byte – low byte)
CRC
1 word
Reply:
FIELD
LENGTH
Relay address
1 Byte
Function
1 Byte (10H)
Beginning address
1 word (0000H) (High byte – low byte)
No. of records
1 word (0003H) (High byte – low byte)
CRC
1 word
Example:
We send the command corresponding to the group of values. For example, if we want to activate Table 2, the
opening command will be the 15 (0F00H).
ADDRESS
FUNCTION
01
10
Reply:
ADDRESS
FUNCTION
01
10
13-2
ANNEX 3 MODBUS MEMORY MAP
COMMAND
BEGINNING
#REGS
0000
00 01
BEGINNING
#REGS
0000
0001
MIF Digital Feeder Protection
SELECTION (HEX)
08
0D
0F
17
07
39
FE
01
#BYTES
DATA0
02
0F00
CRC
01C9
CONFIRMATION (HEX)
09
0E
10
18
08
3A
N/A
02
CRC
A3A0
GEK-106273L
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