Specifications

Chapter7CommunicationProtocolVFD‐G7SeriesFrequencyInverterOperationManual
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Theframethatslavemachinesendtofrequencyinverter：
Slave
address
Function
code
Parameter
address
high byte
Parameter
address
low byte
Read
number
high
byte
Read
number
low
byte
Parity
bit high
byte
Parity
bit low
byte
Theframethatfrequencyinvertercorrespondingtheuppermachine：
Slave
address
Function
code
Read
byte
quantity
The
first
data
high
byte
The
first
data
low
byte
；；； The
n
data
high
byte
The
n
data
low
byte
Parity
bit
high
byte
Parity
bit
low
byte
（3）Forexample
Theuppermachineread twodatafromthefrequencyinverter, andthe twodataissetting
frequency and DC bus voltage，the address is 3001H, 3002H, andthe upper machine
shouldsendthedatatofrequencyinverterasfollows;
Slave
address
Function
code
Parameter
address
high byte
Parameter
address
low byte
Read
number
high
byte
Read
number
low byte
CRC
Parity
bit
high
byte
CRC
Parity bit
high byte
01 03 30 01 00 02 9A CB
The setting frequency of frequency inverter is 50.00Hz (corresponding 16 system data is
1388H). Bus voltage is 5400v (corresponding 16 system data is 1518H).The frequency
inverterfeedbackstothedatatouppermachine:n=2isthenumberofvariablequantity.
Slave
address
Function
code
Read
number
of byte
（2*n）
The
first
data
high
The
first
data
low
The
second
data
high
The
second
data
low
CRC
Parity
bit
high
CRC
Parity
bit
high