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DELTA MS300 “Modbus RTU” via Modbus Poll

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Hello everyone! In previous articles, we have used many different types of PLCs to control Delta MS300 inverters via Modbus-RTU RS485 communication standard.

Today will guide you to use PC (using USB to RS485 port) to control DELTA MS300 inverter. This is a very fast way, we only need a few minutes to control the inverter as well as store data.

PC & DELTA MS300 “Wiring Diagram”

You can use any USB to RS485 port

DELTA MS300 VFD Communication Setting

In addition to the parameters of the inverter installed according to the motor (frequency, voltage, current), we need to set the communication parameters as follows:

+ P00.20 = 1 (Modbus-RTU Control Frequency)

+ P00.21 = 2 (Modbus-RTU Control Motor)

+ P09.00 = 1 (Address Slave = 1)

+ P09.01 = 9.6 (9600bps)

+ P09.02 = 0

+ P09.03 = 1.0 (Time Detect Err = 1.0s)

+ P09.04 = 14 (Modbus-RTU Slection 8bit / stop bit = 1/ Even)

Control Address

>>> Motor Control Address = 2000 (hex)

+ Set Word 2000 = 18 (dec): Forward Run
= 34 (dec): Reverse Run
= 1 (dec): Stop Run

>>> Frequency Address = 2001 (hex)

Monitoring Address
  • Output Frequency = 2103 (hex)
  • Output Current = 2104 (hex)
  • Output Voltage = 2106 (hex)

“Modbus Poll” Programming

+ Motor Control Command

+ Setting Frequency Command

+ Data Monitoring Command

Project Tutorial Video


Recommended software and documentation

+ Download ModbusPoll Software

+ DELTA MS300 VFD Manual PDF Download

Password Extract:

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