Reading Values - GE Multilin MIWII Instruction Manual

B.2 READING VALUES
B.2READING VALUES
®
The ModBus function used is number 3 (READ HOLDING REGISTERS). The message request command is generated
as follows:
Request:
B
Reply:
Example:
Reading 75 registers (150 bytes) beginning from address 04FEH (word with 027F address).
Intel Request:
ADDRESS
01H
Intel Reply
ADDRESS
01H
Motorola Request:
ADDRESS
01H
Motorola Reply:
ADDRESS
01H
B-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
MIWII Directional Power Protection System
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
APPENDIX B
CRC
653DH
DATA74 CRC
0200H 84D5H
CRC
359DH
DATA74 CRC
0002H 2783H
GEK-113308