TECHTOP TD350 - Common Communication Faults

TD350 Series VFD Communication protocol
-287-
Parameter
address
VFD
address
Write
command
CRC
Forward running
03 06 20 00 00 01 42 28
9.5 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 converter uses the serial port COM1, but
COM2 is selected for the communication.
 The settings of the baud rates, data bits, end 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.