INVT Goodrive350-19 Series Operation Manual page 413

Goodrive350-19 Series VFD for Crane
channel of running commands" (P00.02) to the Modbus channel.

Click Send. If the line configuration and settings are correct, a response transmitted by the VFD
is received as follows:
10.4.8 Common communication faults
Common communication faults include the following:

No response is returned.

The VFD returns an exception response.
Possible causes of no response include the following:

The serial port is set incorrectly. For example, the adapter uses the serial port COM1, but COM2
is selected for the communication.

The settings of the baud rates, data bits, stop bits, and check bits are inconsistent with those set
on the VFD.

The positive pole (+) and negative pole (-) of the RS485 bus are connected reversely.

The resistor connected to 485 terminals on the terminal block of the VFD is set incorrectly.
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Communication protocol