Morgensen MSI350 Series, Руководство пользователя, Страница: 302 / 388

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function, you need to select ModbusRTU , select CRC16 (MOMS-DBU SRTU) , and set the start byte
to 1 . After the auto CRC check function is enabled, do not enter CRC information in commands.
Otherwise, command errors may occur due to repeated CRC check.
The commissioning command to set the inverter whose address is 03H to be forward running is as
follows:
Note:
1. Set the address (P14.00) of the inverter to 03.
2. Set "Channel of running commands" (P00.01) to "Communication", and set "Communication
channel of running commands" (P00.02) to the Modbus communication channel.
3. Click Send . If the line configuration and settings are correct, a response transmitted by the inverter
is received as follows:
9.5
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, end 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 resistor connected to 485 terminals on the terminal block of the inverter is set incorrectly.