Specifications

VFD‐G7 Series Frequency Inverter Operation ManualChapter 7 Communication Protocol
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165
10H Error password
The written password from password checking address
is different with the value (FP.03) set by users.
11H
Checking is
wrong
When the RTU format, CRC checking bit or LRC
checking bit of ASCII format of PC sending message
is different with the calculated checking value, the
wrong message will be send.
12H
Modified
parameter is
invalid
In the parameter written command, the data exceeds
the parameter’s range or the current state of written
address can not be rewritten.
13H
System is
locked
When the PC reads or writes, the user’s password is
set, and the lock of the password doesn't be unlocked,
the system will report locked
（3）Forexample1：Tochangethefrequencyinverter’smainfrequencysourceto9through
uppermachine,andstorethatsettingvalueafterpower‐off.
Theuppermachinesendsthedatatofrequencyinverterasfollows;
Slave
address
Function
code
Parameter
address
high byte
Parameter
address
low byte
Data
high
byte
Data
low
byte
CRC
Parity bit
high byte
CRC
Parity bit
high byte
01 06 F0 00 00 09 7A CC
ButthemaxallowedsettingvalueofmainfrequencysourceF0.02sets8,andwhensets9is
illegal data, and the frequency inverter return to abnormal code 03. And the frequency
inverterreturnstothedatatouppermachineasfollows;

Slave
address
Function code
+80H
Abnormal
code
CRC Parity bit
high byte
CRC Parity bit
high byte
01 86 03 02 61
7.4 CRC parity
BasedonMODBUS‐RTU’16CRCpanty,getParitybithighbyteandlowbyte.