Communication
134
Write Multiple Registers
Description: writing register blocks of holding register type (block R/W limited to 125 registers).
Function code: 16
(n is the number of holding registers could be any number between 1 and 125)
Memory Map
VMX-Synergy Plus
TM
Modbus communication is based on reading or writing equipment parameters
from or to the holding registers. The data addressing is zero offset, such that the parameter Modbus
address corresponds to the register number.
Parameter
Modbus Address
Modbus Data Address
Decimal
Hexadecimal
0000
0
0000h
0001
1
0001h
•
•
•
•
•
•
•
•
•
•
•
•
0128
128
0080h
•
•
•
•
•
•
•
•
•
•
•
•
Query
Response
Field
Hex Byte Field
Hex Byte
Slave address
1
Slave address
1
Function
10
Function
10
Address Hi
00
Address Hi
00
Address Lo
0C
Address Lo
0C
No. Reg Hi
0
No. Reg Hi
0
No. Reg Lo
n
No. Reg Lo
n
No. Bytes
n* 2
Crc Lo
71
Data 1 Hi
00
Crc Hi
A3
Data 1 Low
0C
..
…
Data nn Hi
??
Data nn Lo
??
Crc Lo
48
Crc Hi
0C
