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RS-422A/485 Message Example
An example of RS-422A/485 command/response messages is given below.
Reading Storage Register Contents
Read the contents of the storage register only for specified quantities. The addresses must be consecutive,
starting from a specified address. The data content of the storage register are separated into higher 8 bits and
lower 8 bits.
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
Response Message
(During Normal Operation)
Response Message
(During Error)
Slave Address
02H
Slave Address
02H
Slave Address
02H
Function Code
03H
Function Code
03H
Function Code
83H
Start
Address
(Register-
number)
Higher
00H
Number of attached
data bytes
08H
Error code
03H
Lower
20H
Lead stor-
age register
Higher
00H
CRC-16
Higher
F1H
Quantity
(10H Max)
Higher
00H
Lower
65H
Lower
31H
Lower
04H
Next stor-
age register
Higher
00H
CRC-16
Higher
45H
Lower
00H
Lower
F0H
Next stor-
age register
Higher
00H
Lower
00H
Next stor-
age register
Higher
01H
Lower
F4H
CRC-16
Higher
AFH
Lower
82H