AccuEnergy AXM-WEB2, User Manual, Page: 31 / 131

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V: 1.10 Revised: January 2020 29
Chapter 9: Description of Modbus-TCP Protocol
5) Preset/Reset Multi-Register (Function Code 16)
Function Code 16
Query
This function code allows the user to modify the contents of a register. The example below is
a request to an Acuvim II series meter with device address 1 to preset the CT1(500) and CT2(5)
registers. The CT1 data address is 1008H and CT2 is at 1009H.
Transaction
identifier hi
Transaction
identifier lo
Protocol
identifier hi
Protocol
identifier lo
Length hi Length lo
Unit
identifier
00H 00H 00H 00H 00H 0BH 01H
Fun
Data
start
reg hi
Data
start
reg lo
Data #of
reg hi
Data #of
reg lo
Byte
count
Value1
hi
Value1
lo
Value2
hi
Value2
lo
10H 10H 08H 00H 02H 04H 01H F4H 00H 05H
Response
The normal response to a preset Multi-Register request including the MBAP Header, function
code, data start register and the number of registers is shown below.
Transaction
identifier hi
Transaction
identifier lo
Protoco-
lidentifier 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
10H 10H 08H 00H 02H