Qirod QD100 Series User Manual

117
A2.2 Detailed message description of different
commands
A2.2.1 Read one word (2 bytes) —– command code 03H
1. Master request message
Table A.3 Format of master request message
Slave
addres
s
Comma
nd code
Communication
address
Read word
number
CRC code
2 bytes 2 bytes 2 bytes
1 byte
1 byte
High
byte
Low
byte
High
byte
Low
byte
High
byte
Low
byte
03H 00H 01H
1) Slave address and CRC code: See “Table A.2”.
2) Command code: 03H. Request to read 1 word (2 bytes) of the slave.
3) Communication address: The address of read data. This is not the real physical
address for data storage, but a number corresponding to the data. Every control,
state or monitoring parameter of QD100 series frequency inverter corresponds to a
communication address. See “A2.5 Communication parameter”.
4) Read word number: The length of the read data with the word (2 bytes) as the
count unit. When current request asks for reading one word, it is set to 0001H.
2. Message of slave normal response
Table A.4 Slave normal response message
Slave
addres
s
Comma
nd code
Communication
address
Read word
number
CRC code
2 bytes 2 bytes
1 byte 1 byte 2 bytes
High
byte
Low
byte
Low
byte
High
byte
03H 02H
1) Slave address and CRC code: See “A2.2”.
2) Command code: 03H. The same as the master request command code.
3) Read word number: The length of the read data with byte as the count unit. When

Qirod QD100 Series Specifications

General

Brand	Qirod
Model	QD100 Series
Category	DC Drives
Language	English