INVT GD20-0R7G-4 User Manual (English)

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Goodrive20 inverters

Communication protocol

101

7.2.3 ASCII mode

Name Definition

Coding

system

Communication protocol belongs to hexadecimal system. The meaning of message character in

ASCII: “0”…“9”, “A”…”F”, each hex is represented by the ASCII message correspond

s to the

character.

Character ‘0’ ‘1’ ‘2’ ‘3’ ‘4’ ‘5’ ‘6’ ‘7’

ASCII CODE 0x30

0x31

0x32

0x33

0x34

0x35

0x36

0x37

Character ‘8’ ‘9’ ‘A’ ‘B’ ‘C’ ‘D’ ‘E’ ‘F’

ASCII CODE 0x38

0x39

0x41

0x42

0x43

0x44

0x45

0x46

Data

format

Starting bit, 7/8 data bit, check bit and stop bit. The data formats are listed as below:

11-bit character frame:

Starting

bit

BIT1

BIT2

BIT3

BIT4

BIT5

BIT6

BIT7

BIT8

Check

bit

Stop

bit

10-bit character frame:

Starting

bit

BIT1

BIT2

BIT3

BIT4

BIT5

BIT6

BIT7

Check bit

Stop bit

In ASCII mode, the frame header is “:” (“0*3A”), frame end is “CRLF” (“0*0D” “0*0A”) by default. In ASCII

mode, all the data bytes, except for the frame header and frame end, are transmitted in ASCII code mode, in

which four high bit groups will be sent out first and then, four low bit groups will be sent out. In ASCII mode,

the data length is 8 bit. As for ‘A’~‘F’, its capital letters is adopted for ASCII code. The data now adopts LRC

checkout which covers slave address to data information. The checksum equals to the complement of the

character sum of all the participated checkout data.

Standard structure of ASCII frame:

START ‘:’ (0x3A)

Address Hi

Communication address:

8-bit address is formed by the combination of two ASCII codes

Address Lo

Function Hi

Function code:

8-bit address is formed by the combination of two ASCII codes

Function Lo

DATA（N-1）

…

DATA（0）

Data content:

nx8-bit data content is formed by combination of 2n (n≤16) ASCII codes

LRC CHK Hi

LRC check code:

8-bit check code is formed by the combination of two ASCII codes.

LRC CHK Lo

END Hi End character:

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INVT GD20-0R7G-4 Specifications

General

Model	GD20-0R7G-4
Enclosure Rating	IP20
Output Voltage	0-Input Voltage
Control Method	V/F control, sensorless vector control
Overload Capacity	150% for 60 seconds
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overload, Overheat, Short Circuit, Phase Loss
Communication Interface	Modbus RTU
Rated Power	0.75 kW
Input Voltage	3-phase 380-480V AC
Input Frequency	50/60Hz
Cooling Method	Fan cooling