Appendix: Modbus Communication Protocol - Veichi AC300 series Manual

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Technical manual (96 pages)

Table Of Contents

Table of Contents

Appendix: Modbus Communication Protocol

● Communication Frame Structure

Communication data format is as follows:

The byte composition: Including initiation bit, 8 data bit, check bit and stop bit.

Initiation Bit

Bit1

One frame message must be transmitted as a continued data flow, and if there is a interval over 1.5 byte before ending, the receiving equipment

will clear the half-baked information. And the next byte will be considered as the address field of a new frame. Similarly, if the interval between a

new frame start-up and the former frame is smaller than 3.5 byte time, the receiving equipment will consider that it is the continuation of former

one frame. Since the jumbled frame, the final CRC checking value is incorrect, which would lead to the communication mistake.

Communication Control Parameter Group Address Specification:

●

Function Specification

Communication Given

Frequency

Communication

Command Setting

State of Inverter

Frequency Inverter Fault

Code

Communication Given

Upper Frequency

Communication Torque

Setting

The FWD Max Frequency

limit in Torque Control

The REV Max Frequency

limit in Torque Control

Communication Given PID

Setting

Communication Given PID

Feedback

Bit2

Bit3

Bit4

Address

Data Meaning Specification

Definition

0x3000 or

0～60,000 is corresponding to 0.00Hz～600.00Hz

0x2000

0000H: No order

0001H: FWD running

0002H: REV running

0003H: FWD jog

0x3001 or

0004H: REV jog

0x2001

0005H: DEC stop

0006H: free stop

0007H: malfunction reset

0008H: Running banned command

0009H: Running allowed command

Bit0

Bit1

Bit2

0x3002 or

Bit3

0x2002

Bit4

Bit5

Bit6

0x3003 or

current inverter fault code(refer to fault code table)

0x2003

0x3004 or

0～32000is corresponding to 0.00Hz～320.00Hz

0x2004

0x3005 or