Goodrive350-19 series VFD Communication protocols
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10.4.8.4 Modbus communication commissioning example
A PC is used as the host, an RS232-RS485 converter is used for signal conversion, and the PC serial
port used by the converter is COM1 (an RS232 port). The upper computer commissioning software is
the serial port commissioning assistant Commix, which can be downloaded from the Internet.
Download a version that can automatically execute the CRC check function. The following figure
shows the interface of Commix.
First, set
the serial port to
COM1
. Then, set the baud rate consistently with P14.01. The data bits,
check bits, and end bits must be set consistently with P14.02. If the RTU mode is selected, you need
to select the hexadecimal form
Input HEX
. To set the software to automatically execute the CRC
function, you need to select
ModbusRTU
, select
CRC16 (MODBU 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 VFD whose address is 03H to be forward running is as
follows:
Parameter
address
VFD
address
Write
command
CRC
Forward running
03
06
20 00
00 01
42 28
Note:
1. Set the address (P14.00) of the VFD 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 VFD
is received as follows:
