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C.2 READING VALUES
C.2READING VALUES
®
The ModBus
function used is number 3 (READ HOLDING REGISTERS). The message request command is generated
as follows:
Request:
C
Reply:
Example:
Reading 75 registers (150 bytes) beginning from address 04FEH (word with 027F address)
IntelRequest:
ADDRESS
01H
Intel Reply
ADDRESS
01H
Motorola Request:
ADDRESS
01H
Motorola Reply:
ADDRESS
01H
C-2
FIELD
Relay address
Function
Beginning address
Number of registers
CRC
FIELD
Relay address
Function
Nº of bytes
Value of the registers
CRC
FUNCTION
03H
FUNCTION
BYTES
03H
96H
FUNCTION
03H
FUNCTION
BYTES
03H
96H
LENGTH
1 Byte
1 Byte (03h)
1 word (High Byte – Low Byte)
1 word (High Byte – Low Byte)
1 word
LENGTH
1 Byte
1 Byte
1 Byte (Number of registers * 2)
n data bytes
1 word
BEGINNING
#REGS
04FEH
004BH
DATA0
...
500DH
BEGINNING
#REGS
027FH
004BH
DATA0
...
0D50H
MIFII Digital Feeder Relay
APPENDIX C
CRC
653DH
DATA74
CRC
0200H
84D5H
CRC
359DH
DATA74
CRC
0002H
2783H
GEK-106237P
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