Omron SYSDRIVE RV Series User Manual page 315

DSR Message
An example of command/response messages is given below.
Reading Storage Register Contents (Function Code: 03 Hex)
Read the contents of the storage register only for specified quantities whose addresses are consecutive, starting
from a specified address. The contents of the storage register are separated into higher place 8 bits and lower
place 8 bits, and comprise the data within response messages in address order.
The following table shows message examples when reading status signals, error details, data link status, and
frequency references from the slave 2 Inverter.
Command Message
Slave Address
Function Code
Higher
Start
place
Address
(register
Lower
number)
place
Higher
place
Quantity
(10H max.)
Lower
place
Higher
place
CRC-16
Lower
place
Response Message
(Normal Message)
02H Slave Address
03H Function Code
Number of attached data
00H
bytes
Higher
20H
place
Lead stor-
age register
Lower
00H
place
Higher
04H
place
Next stor-
age register
Lower
45H
place
Higher
F0H
place
Next stor-
age register
Lower
place
Higher
place
Next stor-
age register
Lower
place
Higher
place
CRC-16
Lower
place
Communications Functions
Response Message
(Error Message)
02H Slave Address
03H Function Code
08H Error code
Higher
00H
place
CRC-16
Lower
65H
place
Note The MSB of the function code will be
00H
set to 1 when an error occurs.
00H
00H
00H
01H
F4H
AFH
82H
02H
83H
03H
F1H
31H
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