Omron J7 series, User Manual

Page: 116 / 177

102
DSR Message and Response
Chapter 7-4
Response
Normal
Error
Note When an error occurs, the MSB of the function code will be set to 1.
Example of Data Read
In the following example, four-register data (status signal data) is read from
register 0020 Hex of the Inverter with a Slave address of 02.
DSR Message
Byte No. Data
1 Slave address
2 Function code (03 Hex)
3 Number of bytes of attached data
4 Data of start register MS B
5 LSB
6 Data of next register MSB
7 LSB
8 Data of next register MSB
9 LSB
: : :
n–1 CRC-16 check
n
Byte No. Data
1 Slave address
2 Function code (83 Hex)
3 Error code
4 CRC-16 check
5
Byte No. Data Data example
(Hex)
1 Slave address 02
2 Function code 03
3 Register No. of read start data 00
4 20
5 Number of registers of read data 00
6 04
7 CRC-16 check 45
8 F0