C.9 Message Examples
Below are some examples of command and response messages.
u
Reading Drive MEMOBUS/Modbus Register Contents
Using the function code 03H (Read), a maximum of 16 MEMOBUS/Modbus registers can be read out at a time.
The following table shows message examples when reading status signals, error details, data link status, and frequency
references from the slave 2 drive.
Command Message Response Message (normal) Response Message (fault)
Slave Address 02H Slave Address 02H Slave Address 02H
Function Code 03H Function Code 03H Function Code 83H
Starting No.
Upper 00H Data Quantity 08H Error Code 03H
Lower 20H
1st storage
register
Upper 00H
CRC-16
Upper F1H
Data Quantity
Upper 00H Lower 65H Lower 31H
Lower 04H
Next storage
register
Upper 00H
CRC-16
Upper 45H Lower 00H
Lower F0H
Next storage
register
Upper 00H
Lower 00H
Next storage
register
Upper 01H
Lower F4H
CRC-16
Upper AFH
Lower 82H
u
Loopback Test
Function code 08H performs a loopback test. This test returns a response message with exactly the same content as the command
message and can be used to check the communications between the master and slave. User-defined test code and data values
can be set.
The following table shows a message example when performing a loopback test with the slave 1 drive.
Command Message Response Message (normal) Response Message (fault)
Slave Address 01H Slave Address 01H Slave Address 01H
Function Code 08H Function Code 08H Function Code 89H
Test Code
Upper 00H
Test Code
Upper 00H Error Code 01H
Lower 00H Lower 00H
CRC-16
Upper 86H
Data
Upper A5H
Data
Upper A5H Lower 50H
Lower 37H Lower 37H
CRC-16
Upper DAH
CRC-16
Upper DAH
Lower 8DH Lower 8DH
C.9 Message Examples
YASKAWA ELECTRIC SIEP C710606 31B YASKAWA AC Drive – J1000 Technical Manual
221
C
MEMOBUS/Modbus
Communications
http://nicontrols.com
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