Common Communication Faults - IMO HD2 IP Series Instruction Manual

HD2 IP55 High-ingress Protection Series Inverter

9.5 Common communication faults

Common communication faults include the following:
1. No response is returned.
2. The inverter 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 inverter.
3. The positive pole (+) and negative pole (-) of the RS485 bus are connected reversely.
4. The resistor connected to 485 terminals on the terminal block of the inverter is set incorrectly.
-286