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agility
TM
Series Soft Start User Manual
MAN-AGY-001. Version 04. 21/09/2018
Write Multiple Registers
Description: writing register blocks of holding register type (block R/W limited to 8 registers).
•
Function code: 16 example
Memory Map
agility
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.
Modbus Address Memory Map
Parameter Modbus
Address
Modbus Data Address
Decimal
Hex
0000
0
0000h
0001
1
0001h
•
•
•
•
•
•
•
•
•
•
•
•
0128
128
0080h
•
•
•
•
•
•
•
•
•
•
•
Message Timing
In the RTU mode there is no specific start or stop byte that marks the beginning or the end of a
message. Indication of when a new message begins or when it ends is achieved by the absence of
data transmission for a minimum period of 3.5 times the transmission time of a data byte. Thus, in case a
message is transmitted after this minimum time has elapsed; the network elements will assume that the
first received character represents the beginning of a new message.
Modbus Function 16 Transaction Table
Query
Response
Field
Hex Byte
Field
Hex Byte
Slave address
01
Slave address
01
Function
10
Function
10
Address Hi
00
Address Hi
00
Address Lo
01
Address Lo
01
# Words Hi
00
# Words Hi
00
# Words Lo
01
# Words Lo
01
# Bytes
02
CRC Lo
50
Data Hi
00
CRC Hi
09
Data Lo
02
CRC Lo
26
CRC Hi
40
Communication (continued)
