Omron VS mini J7 User Manual page 116

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