INVT GD20-0R7G-4 User Manual

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:

INVT GD20-0R7G-4 Specifications

General

Brand	INVT
Model	GD20-0R7G-4
Category	DC Drives
Language	English