Frequency Inverter ST600 Series High-Performance Multifunction VFD Communication protocol
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9.5 Common communication faults
Common communication faults include the following:
1. No response is returned.
2. The VFD returns an exception response.
Possible causes of no response include the following:
1. The serial port is set incorrectly. For example, the converter uses the serial port COM1, but COM2
is selected for the communication.
2. The settings of the baud rates, data bits, end bits, and check bits are inconsistent with those set on
the VFD.
3. The positive pole (+) and negative pole (-) of the RS485 bus are connected reversely.
4. The resistor connected to RS485 terminals on the terminal block of the VFD is set incorrectly.
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