8000m Series
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8.4 Protocol Function
Different respond delay can be set through drive's parameters to adapt to different
needs.
For RTU mode, the respond delay should be no less than 3.5 bytes interval.
The main function of modbus is to read and write parameters. The modbus
protocol supports the following commands:
03H
Read VFD's function parameter(s) and status data
06H
Write single function parameter or control command or communication settings to
VFD
All drive's function parameters, control command and status data are mapped to
modbus R/W data address.
For the data address of VFD’s control command, communication settings and
status data, please refer to the following table.
Parameter Description
Address
Meaning of value
R/W Feature
Control Command
1000H
0001H: Forward
W/R
0002H: Reverse
0003H: JOG forward
0004H: JOG reverse
0005H: Stop
0006H: Coast to stop
0007H: Reset fault
0008H: JOG stop
VFD status data
1001H
0001H: Forward running
R
0002H: Reverse running
0003H: Standby
0004H: Fault
0005H: LU Status of inverter
