INVT CHV180-004G-4 User Manual

CHV180 series frequency inverter special for elevator Communication protocol
.100.
address 1.
Node addr.
Command
Data addr. Read No. CRC
0x01 0x03 0x00
0x02 0x00 0x01 0x25
0xCA
The table below shows the reply frame from slave node address 1.
Node addr.
Command
Bytes No. Data CRC
0x01 0x03 0x02 0x00 0x00 0xB8
0x44
ASCII mode
In ASCII mode, the frame head is “0x3A”, and default frame tail is “0x0D” or “0x0A”. The
frame tail can also be configured by users. Except frame head and tail, other bytes will
be sent as two ASCII characters, first sending higher nibble and then lower nibble. The
data have 7/8 bits. “A”~“F” corresponds to the ASCII code of respective capital letter.
LRC check is used. LRC is calculated by adding all the successive bytes of the message
except the head and tail, discarding any carriers, and then two’s complementing the
result.
Example of Modbus data frame in ASCII mode:
The command frame of writing 0x0003 into address “0x1000” of slave node address 1 is
shown in the table below:
LRC checksum = the complement of (01+06+10+00+0x00+0x03) = 0xE5
Frame head Node addr. Command
Data addr.
Code
0 1 0 6 1 0 0 0
ASCII
3A 30 31 30
36 31
30
30
30
Data to write LRC Frame tail
0 0 0 3 E
5 CR LF
30 30 30 33 45
35 0D 0A
10.4 Protocol function
Different respond delay can be set through drive’s parameters to adapt to different needs.
For RTU mode, the respond delay should be no less than 3.5 bytes interval, and for
ASCII mode, no less than 1ms.
The main function of Modbus is to read and write parameters. The Modbus protocol
supports the following commands:
0x03 Read inverter’s function parameter and state parameters
0x06 Write single function parameter or command parameter to inverter
All drive’s function parameters, control and state parameters are mapped to Modbus
R/W data address.

INVT CHV180-004G-4 Specifications

General

Brand	INVT
Model	CHV180-004G-4
Category	Inverter
Language	English