Function Code 16 (10H) - Write Multiple Registers - Veesta World V-PM2000 Series User Manual

VP-2040 Enhanced IED
V-PM2000 Series, Veesta Power Measurement
Instructions & User's Manual
Slave Response
Slave Address
Function Code
Operation Code
Code Value
CRC
8.5.3

Function Code 16 (10H) - Write multiple registers

8.5.3.1 Message format and example
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Bytes
1
1
2
2
2
This function code allows single and multiple setpoints to be stored
into the memory of VP-2040 device. Modbus® "registers" are 16 bit
(two byte) value transmitted high order first.
This all VP-2040 setpoints are sent as two bytes. The maximum
number of setpoints that can be stored in one transmission is
dependent on the slave device. Modbus® allows up to a maximum of
60 holding registers to be stored. The VP-2040 allows 60 registers to
be stored in one transmission.
The VP-2040 response to this function code is to echo the slave
address, function code, starting address, the number of setpoints
stored, and the CRC.
In this example we want to change the PT Primary Side value to the
132000 Volts. The register numbers that hold the PT Primary side is
in 41003 as low word of PT Primary value and 41004 as high word of
the value of set-point and 132000 is 000203A0 in Hex format.
After the transmission in this example is complete, the VP-2040 slave
01 will have the following setpoints information stored:
Register Number HEX Address
41003
41004
Chapter 8 - Protocol and Communication
Example
Meaning
(hex)
01 Message for slave 1
05 Execution Operation
00 Relay 1 Command
00
FF ON Command
00
8C CRC calculated by the master
3A
03EA
03EB
Data (HEX)
03A0 (low word)
0002 (high word)
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