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V: 1.10 Revised: January 2020
27
Chapter 9: Description of Modbus-TCP Protocol
DI1: bit0 DI2: bit1 DI3: bit2 DI4: bit3
Transaction
identifier hi
Transaction
identifier lo
Protocol
identifier hi
Protocol
identifier lo
Length hi
Length lo
Unit
identifier
00H
00H
00H
00H
00H
04H
01H
Fun
Byte count
Data
02H
01H
0FH
The content of the data is,
7
6
5
4
3
2
1
0
0
0
0
0
1
1
1
1
MSB LSB
3) Read Data (Function Code 03)
Function Code 3
Query
This function allows the user to obtain the measurement results of the Acuvim II series meter.
Below is an example to read 6 registers corresponding to the device clock of the meter, starting
at 1040H.
Transaction
identifier hi
Transaction
identifier lo
Protocol
identifier hi
Protocol
identifier lo
Length hi
Length lo
Unit
identifier
00H
00H
00H
00H
00H
06H
01H
Fun
Data start
reg hi
Data start
reg lo
Data #of
reg hi
Data #of
reg lo
03H
10H
40H
00H
06H
An example response is provided to read the time (2006-12-18 14:15:20).
Transaction
identifier hi
Transaction
identifier lo
Protocol
identifier hi
Protocol
identifier lo
Length hi
Length lo
Unit
identifier
00H
00H
00H
00H
00H
0FH
01H