TEC TECDrive20-EU Series - Common Communication Faults

TECDrive20-EU Series Inverter Communication protocol
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If the operation succeeds, the response message is as follows:
Continuous
writing
command
Parameter
address
Data
number
Inverter
address
LRC
Note: The blank in the above command is for illustration. The blank cannot be added in the
actual application unless the upper monitor can remove the blank by themselves.
7.6 Common communication faults
Common communication faults include the following:
 No response is returned.
 The inverter returns an exception response.
Possible causes of no response include the following:
 The serial port is set incorrectly. For example, the converter 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 inverter.
 The positive pole (+) and negative pole (-) of the RS485 bus are connected reversely.
 The RS485 wire cap on the terminal board of the inverter is not connected. This wire cap is
at the back of the terminal block.