Omron SYSDRIVE 3G3JV User Manual page 139

Communications
D Response
Normal
Byte No.
1 Slave address
2 Function code (03 Hex)
3 Number of bytes of attached data
Data of start register
4
5
Data of next register
6
7
Data of next register
8
9
:
CRC-16 check
n–1
n
Error
Byte No.
1 Slave address
2 Function code (83 Hex)
3 Error code
4 CRC-16 check
5
Note When an error occurs, the MSB of the function code will be set to 1.
H 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.
D DSR Message
Byte No.
1 Slave address
2 Function code
3 Register No. of read start data g
4
5 Number of registers of read data
6
7 CRC-16 check
8
7-14
g
g
g
Data
g
Data
:
Data
Chapter 7
MS B
LSB
MSB
LSB
MSB
LSB
:
Data
example
(Hex)
02
03
00
20
00
04
45
F0